Saturday, April 27, 2013

Air Conditioner Thermostats


A thermostat is an apparatus for maintaining the temperature of a system within a particular range by directly or indirectly controlling the flow of heat energy into or out of the system. All air conditioners have thermostats that can be manually operated or automatically preprogrammed to work at regulating the room temperature. There are many ways in which you can use an air conditioner thermostat effectively.

One of the most successful yet economical ways to reduce your air conditioning costs is to adjust the thermostat setting on the air conditioner. The savings are more noteworthy when you set your thermostat at 78 degrees Fahrenheit or higher. For each degree you raise the thermostat setting, you reduce seasonal cooling costs by 7 percent to 10 percent. In doing so, you can use ceiling fans in addition to the air conditioner and thus, save a lot of money.

Most centrally located air conditioner thermostats are equipped with two fan settings, 'on' and 'auto'. When the thermostat setting is set to 'on' the fan runs constantly and when it is set to 'auto' the fan runs only during cooling cycles when the air conditioner compressor is in use. When the air conditioner is in use all day, the cooling compressor only operates about 50 percent of the time, that is, for about 12 hours. The extra fan operating time that occurs when the thermostat is set to 'on' can add roughly $25 to monthly air conditioning bills. Using the 'auto' setting, alternatively, saves energy and money because the fan operates fewer hours. Besides achieving energy and cost savings, the 'auto' setting also promotes more comfort by offering better humidity control as moisture removed during the cooling cycle is re-circulated back into the home while the compressor is off.

Thus, thermostats play an important role in the cost and function of an AC.

Convenient Cooling With A Split Air Conditioner


Though ordinary vented portable air conditioners offer quite a few advantages to those with a need or desire for cooler conditions during the summer, combined with a limited budget, they still have a few disadvantages as well.

They are quite bulky, occupying a noticeable area of the floor and trailing a robust hose to the window for venting hot air. They are also fairly noisy and may disturb you while you sleep or prevent easy conversation nearby. These potential failings are solved by the split air conditioner.

Split systems are a useful application of human ingenuity to solving the problem of cooling a room, while keeping the interior uncluttered and quiet. If you are bothered by the noise of an air conditioner and the fans it uses to suck in warm air and distribute cooled air, or if you want to keep the device's physical presence in your room to a minimum, these split mechanisms offer both features.

How a split air conditioner works

A split air conditioner consists of two separate portions connected by a cable. One portion of the machine is mounted on the exterior of the wall, while the other part is placed inside the room that is to be cooled. There are both single and multiple room versions of split units, allowing you to cool either a single room, a group of rooms, or different chambers at various times.

The exterior unit of a split system is the "noise generating" unit - since it is located well away from you, on the outside of your house, you will not hear it except when you walk by outside. This part of the system houses the compressor, where refrigerant is alternately exposed to low pressure, becoming a vapor, and high pressure, where it condenses into a liquid again. The heat exchange that occurs during this process expels heat picked up by the refrigerant in the room's interior, and sends cold refrigerant back into the house again.

A cable connects the two portions of the split system, with refrigerant hoses inside it. This cable usually passes through a small hole in the wall made for this purpose. The interior unit is purely designed to collect heat and radiate cold, shunting the heated refrigerant to the exterior unit.

All air circulation and moisture condensation occurs in the exterior unit, so all fan and compressor noise is generated here. The moisture is vented or drips out of the unit, so there is no condensate tank for you to empty. The interior unit is silent, since you cannot hear the refrigerant flowing through it, and is usually quite small and unobtrusive. This neat size and silent operation makes the split system very pleasant to use in your house.

Fresh air and split systems

Though a split air conditioner is much quieter than a portable or a window unit, it does have a drawback or two to balance out this superiority of design. Since all heat exchange occurs through liquid refrigerant, there is no air exchange between the house interior and the outdoors. Therefore, the air is cooled efficiently but may become stale. Some split air conditioners allow you to add an air hose, too, to bring fresh air into the house, but not all models offer this feature.

Central Air Conditioning For Homes


So you've decided to install a central air conditioning.

Around seventy percent of new house constructions in the US are installing the central ac units. Though air conditioning was not necessary many decades ago, it is really uncomfortable these days without it. The people with old homes can also install air conditioners.

If you are in search of best central ac, then you must keep few points in mind. You must get your air conditioning equipment installed by the qualified experts.

When talking of saving on air conditioner energy bills, topic of SEER usually comes to mind. SEER (seasonal energy efficiency ratio) is used to rate the central air conditioning unit. You are in for a big savings if you replace your old worn out air conditioners with the brand new SEER rated units.

Make it a point to consult some good engineering firm who will inform you about the proper central air conditioning system required in your house.

Selecting Your Unit and Installer

There are many reasons for you to go for the central air conditioner unit. It is most efficient way to cool a house as it directly supplies cool air to the rooms whether doors within the house are closed or open.

The house backyard is the most suitable place to install the condenser unit of AC. This is where you would require an expert guidance. You must make sure that they properly inspect your house and each room where you would like to have diffusers (ceiling outlets) in. The electric load of your house will be increased greatly as the central air conditioning system is an electricity guzzler. Many mains will not be able to accommodate this new requirement and would have to be upgraded.

Maintenance of Your AC System

Proper maintenance is a must to enable your AC unit to last long without any difficulties. Regular care like proper cleaning would make them more efficient for a longer duration. You should keep the compressor compartment (condenser) placed outside the house, as clean as is possible. The indoor return air filter should also be kept clean to improve the flow of air around the house. If you accomplish these simple things, you will get several years of unhindered service from your central air conditioning unit.

Friday, April 26, 2013

What US Navy Bootcamp Was Like for Me As an Enlisted Serviceman


Before I joined the Navy, in May of 1982, my friend Jerry, introduced me to his recruiter at a public park, where they were cooking out some hot dogs, and drinking some beer. I shook his hand, and ate a hot dog, and just kicked back.

We did not really even talk about the Navy. I told him I wanted to go in, because I knew I was ready, and that there were not that many doors open to me, at the moment. I was surprised when he said I would have to take some tests, and other things like that. I said, "Fine, just tell me what to do, and where to do it at."

After going down to Detroit, to take a bunch of tests, physical exams, and tons of paperwork, there was just one more test. One of the recruiters, who was straight as an arrow, and had a rule book in his pocket, probably, asked me, "When was the last time I smoked marijuana?" I asked him, "Why?" He said that I had checked it off on one of my forms, that I had smoked marijuana before. He said, "If you have smoked it within the last 6 months, you cannot enter the Navy."

I told him, "It was 6 months ago, since I had smoked marijuana." This guy brought out a calendar, and went back six months, and asked me, "Was this the date that you smoked it?" Like I could really remember anyway. As a kid growing up in Michigan, most all the kids I hung around in junior high, and high school, had all did the same things together. Almost every weekend, there was a party, and plenty of smoking and drinking. I'm sure it was just a day or so, when I went in there.

This guy was too much, when I picked the date on the calendar, he told me I was one day shy of the 6 months. He told me that I would have to get a waiver to enter the Navy. I told him, "Fine, let me apply for the waiver." He said, You will have to meet with a psychiatrist." I met with the psychiatrist that same day. I was asked a lot of questions by the psychiatrist, and he gave me a clean bill of health, and I was able to join the Navy.

I was taking a trip from Detroit to Orlando, where I would be attending boot camp. I was kinda surprised, because the Navy had a boot camp base, at Great Lakes, IL, and it was all guys, no girls, at that boot camp base. Why they spent more money, sending me farther away, I don't know, but I liked it. The nice thing about Orlando, was it was co-ed, at least there were girls going to be there. They tried to make sure, no one could get close to each other, but they could never keep the boys away from the girls, or even the girls away from the boys.

They put all of us that were going to Orlando, Florida, for boot camp, on one plane. I was seated next to a nice pretty girl close to my own age. She was on her way back home to visit her parents. The flight was terrible, it was only the 2nd time I had flown on an airplane, and this flight from Detroit to Orlando was turning into a carnival ride, and I hate carnival rides. Up and down it was going, it was jumping around fast, and making lots of shaking and bumping noises. It was terrible, just like you would see in a movie, everyone on board was in a panic state. The lights were blinking on and off, it would just drop out of the sky fast, and pull your stomach up into your throat.

When we finally landed, we were all in our seats still, waiting to leave the plane. The pretty girl that had been sitting next to me, and waiting to meet her parents again, could not handle it, and threw up all over herself. I was behind her, when she left the plane, and it was heart breaking, to see her be greeted by her mother and father like that. They had to take her immediately to the rest room, to clean her up. I felt so bad for her.

We were met at the airport, by Navy personnel, and several white Navy buses. Other planes had come in from different parts of the country, with other people on board, just like me, long hair, long side burns, just regular Joe's off the street. The first thing they did, was have us line up, and stand in line, with no talking.

We were taken to a building, and given all kinds of directions to follow, until late into the evening. This continued until the early morning hours. "This treatment must be part of our conditioning," I thought. We were all given our haircuts the next day. We got to see most of the guys, get all of their hair cut off. It was quick and to the point.

I learned early on, not to volunteer for anything, when one of the company commanders would ask for a volunteer. Whenever they would ask for 3 volunteers, for example, eventually all those 3 volunteers, would be doing push ups, or running in circles with a rifle, eventually. I also thought, to just keep my mouth shut, and not volunteer for anything, and just get threw boot camp as low under the radar as I can.

Back then, if someone was hiding from the law, I guess it was a good idea to ditch society, and join the military. One day, we were in the barracks, and the commander told us to line up, which all of us immediately did. He told us, to, "about face", which means to turn around, and then some military police officers came in, and took one of the new guys out, in hand cuffs. He was a big black guy, that had 2 gold front teeth. Later, one of the company commanders said, he was wanted on murder charges, and tried to hide out in the Navy.

We had two company commanders in charge of our unit. One of them was a little guy, who was pretty mean to everyone. The other one was a more nicer, cooler guy. He did not go around yelling, like a lot of them did during boot camp days. On one of the days, we were all taken out to a building, and told to stand in line. The cooler company commander said that each of us is allowed a 15 minute phone call, to call our loved ones. We would have to stand in line to use the phone. He said when you are done making your phone call, you can go over to this section and relax.

I did not see any reason to stand in line for 2 hours to use the phone, since I did not need to make a phone call. I asked him if I had to stand in line, because there was nobody that I needed to call at this time. He kinda just looked at me and said I could go sit down and relax.

We went threw many inspections in boot camp. Only one time did I ever lose my temper. It was called hell week, and we were all going threw an inspection of the worst kind. About 12 other company commanders came into our barracks, and just start raising the most hell you can have... Yelling... Screaming... Cussing... Calling everyone in the room, any name you could think of, and worse. They were ripping apart bunks, throwing clothes everywhere, it looked just like a frat party gone wild.

It was crazy. Guys walking around with underwear on their heads. Other guys doing push ups, and then strange men, you never met before, just yelling right into your face. One of the guys that was getting yelled at, that was standing right next to me, could not take it anymore, and he fainted. That's when I lost it, and started yelling at the commander, "You fucking asshole," I yelled at him. "Look at what the fuck you did," I yelled at him. He just looked at me, and kinda worried about the guy next to me, that passed out. I just stood there, and did nothing else. He came to, a minute later, and that company commander just seemed to disappear from the rest of the torture.

I knew it was all a game, at least to the company commanders. To us, it seemed like hell week, and it was hell week, but we were still human, and a guy can only take so much.

At the end of boot camp, a lot of the people, have their moms and dads fly in, from all over the country, to see them graduate from boot camp. Myself, I still thought I was only gone for 2 months, and my dad would never fly to see me just only after 2 months. But some of these guys, must of been really close to their moms and dads. I would of been embarrassed to ask my dad to come watch me graduate from boot camp, to me, I was still waiting to join the Navy, and boot camp was just a test.

During boot camp, there were lots of times, for just sitting around, and shooting the shit with other guys. Some of the guys, had already been in the service before. Maybe the Army, or Air Force, and they said the service is nothing like boot camp, but they had to go threw boot camp again, because they got out for a short time, and wanted to come back in. I thought, "Wow, who would go threw boot camp twice? They must of really liked the service," I thought.

We did get to have one night, that we were all allowed to go out into town, with no one watching us, or going with us. It was pretty much all the guys from boot camp, that went out, and we had also just received our first pay checks, after spending two months in boot camp. Most all of the guys in the barracks, already knew which bars to go to. It was all strip bars, and nobody really wanted to go anywhere else.

Most of us went to this one bar, which had tons of sexy chicks dancing naked, and walking around in little sexy bikinis. We all got lots of lap dances, and it was a really rocking place. Me and three other guys, were able to go outside, and ask the cab driver, "Where do we get a chick that will do all of us?" He said he knew just the place we could go.

He drove us somewhere we did not know, and we ended up picking up this tall sexy girl with blond hair. She ended up doing each one of us, orally, right there in the cab we hired. We had only about 4 hours to be able to be away from the base, and we were able to get it all done. Most all the other guys, at the club, and around town, seemed to get lucky like that also, picking up chicks that were used to the guys getting out of boot camp after two months of no sex.

Some of the guys, were actually able, to hook up with some of the girls, from the girls side of the base. They did it by passing notes, and using sign language when we were out on the cement exercise fields they called grinders. They were able to hook up, during those 4 hours we were allowed out for our first liberty. For the rest of us, it was out to the bars, and try your luck at finding a girl for the night. I believe those girls were used to the base, and the guys getting their night off, because there were lots of girls, ready for action, in the town.

One thing for sure about the Navy, there were always girls, everywhere, it seemed. By that, I mean in other countries, there are just beautiful girls everywhere. It seems in some of these countries, they already know you are coming to town, and they have small towns set up, for when several hundred, to several thousand, guys show up on all kinds of ships, and head into town. Those are the funniest times for sure. Back when sex was practically safe, and it was in abundance, and all you wanted.

These days, a person would take their life in their hand with aids, and any other diseases out there. In the early 80's, it was a free for all, and the Navy seemed to be a big sponsor of some of the places. I was young, dumb, and horny as hell, and I thought it was a great idea, and I still do.

The Navy gave me more adventure, then I could ever get by myself, unless I was independently wealthy. In 1986, I was actually able to verify the world is round, since I was able to go around it by air, land, and sea.

It was so amazing to me, when I showed up at JFK international airport, and thought to myself, "Wow, the world really is round." I left the United States, from California, and I went all the way around it, and now I'm coming back threw the East Coast, and it's just amazing, when I thought about it at the airport when I was standing there.

At the end of boot camp, they tell you, "You will be leaving for school." That is where they train you to do your job for the Navy. Some people, were going to be welders, others would be gunners, or supply clerks. My job, was to be an office worker, who takes care of officer's paperwork. Personnel men take care of the enlisted paperwork of the enlisted people, and yeomen take care of the officers paper works for officers.

At first, when I joined the Navy, the person asked me what I wanted to do for my job in the Navy. I told him, "I never really thought about it." I thought for a moment, what might be an easy job in the Navy? I said, "Maybe I could cut hair." He said I would not want to do that, that it was mostly black guys that cut hair in the Navy, and I wouldn't fit in. I did not know what a Yeoman was, at the time, but he was a Yeoman, and he put me down for Yeoman Training. So off to Yeoman school I would go for my next duty station.

Ducane Air Conditioners - Simple Yet Effective


Air conditioners are absolutely essential to cool homes, offices and commercial establishments in the hot summer months so as to provide a healthy and comfortable indoor environment. The best of units available are simple to operate and maintain yet provide effective and efficient cooling. Some of the best quality machines available in the market are provided by Ducane Air Conditioners.

These units are known for their simplicity and ease of maintenance and service. A single side panel needs to be removed to get access to all the internal parts. This makes service or repair a very easy and quick job and helps save a lot of time, money and effort. As per most Air Conditioner Reviews, these models require much lesser time for regular maintenance and service as compared to most other options.

The heart of any air conditioning unit is the compressor. The quality of cooling provided hence depends almost entirely on the quality and performance of the compressor. These units come with a durable compressor that has the capability to provide sustained cooling for prolonged intervals of time. The design is such that the units usually have a prolonged life. Sometimes due to constant operation, a high pressure or a high temperature can envelop the compressor and reduce its performance. This is skillfully avoided by the presence of internal thermal protection and pressure relief valves that protect the compressor from unfavorable conditions thereby improving its performance, saving on energy bills and prolonging the life of the air conditioner.

Cooling is further enhanced by covering the condenser coil with copper tubing. This helps the unit to transfer the maximum amount of heat possible and hence improves its performance. Further, the hot air is discharged upwards instead of sideways so as to keep the outside air around the unit cool. This also reduces the noise generated by the unit as the air is not thrown out directly at the surrounding plants and walls.

More often than not, the units are placed outside in the open and have to face the elements of nature like sun, rain and frost. These elements combine to slowly harm the outer part of the unit and then the inner components thereby reducing the life. This is delayed simply providing a louvered panel and a wire coil guard that protect the unit and its components.

Most of the features of a Ducane Air Conditioners are simple adjustments. The company has utilized whatever was available to come up with effective and efficient units. Models are available with Seasonal Energy Efficiency Ratios of 13 SEER and 14 SEER. These help save a lot on the power bills in the long run and are hence preferred by a number of people across the country.

Home Heating System: Boost the Heat in a Cold Bedroom


Homeowners know when they're cold and they know where their cold. They may not know how to light a pilot light, or air seal an attic floor, or balance a home heating system, but they know when they are cold. Bedrooms are often the coldest room in the house and most often people just live with it. Stick the kid in the cool bedroom, throw a couple extra blankets on the bed and tell them to finish their homework.

Dealing with a cool bedroom is frustrating. If you turn up the heat to warm the room, the rest of the house gets too warm. Shut all the heating registers except the bedroom and it puts too much back pressure on the furnace. Too often I see a household try to adjust the temperature of one room by closing heating registers in other rooms and soon they have half the registers in the house closed and the home heating system working overtime to satisfy the heating request at the thermostat.

Usually, the home heating system is designed by a professional Heating Contractor that went to HVAC school for several hours a week for a number of years. A Heating contractor must pass an apprentice program before he or she can even take the test for their journeyman license.

HVAC Education

During the educational phase of the heating and cooling training, they are taught how to do a heating load calculation on a home. They take the heating load and develop a designed heating system that includes furnace size, fan capacity, duct size, air flows, and register size. In other words, heating systems are designed to heat all rooms evenly and to work as a system with all registers open.

If you have one bedroom that is cooler than the rest of the house, one of two things has happened:

  • The heating system was designed by a contractor that barely passed the test, or

  • the heating system is broken.

Recently, I had a homeowner complain that they got very little air flow out of the heating register in their dining room. The dining room was cooler than other parts of the house. With a flow hood, I registered a 75% decrease of air flow at the register as compared to the register in the living room. I removed the register grill, took a flashlight and mirror and looked down the inside of the heating duct.

With the mirror to see around the initial elbow, I could see that a flow damper valve was installed in the heating duct. Further inspection showed that all the heating ducts in the home had a flow damper installed near the registers. The damper in the dining room was the only one that was closed most of the way. The homeowner was not aware that flow dampers were a part of the homes heating system.

Heating Duct Damper

Flow dampers are a bit unusual in my neck-of-the-woods, I don't see them very often. Flow dampers are added to a heating system to allow manual adjustment of the flow of air to the registers. With dampers, the flow of conditioned air can be balanced so warm and cool areas of the home can be eliminated. To keep from putting increased pressure on the furnace fan motor, when one damper is closed down another damper should be opened up.

Sometimes, I believe a heating contractor may throw in a bunch of flow dampers when he looses his pencil and can't be sure of how big to make the heating ducts or how many registers need to be in a room.

6 Ways to Boost the Heat in a Cold Bedroom.

Repair Heating Duct:
There is always the possibility that the duct system has a problem that can be fixed. Ducts can become partially or totally disconnected and flexible ducts can become pinched off or collapsed. This is the first and most important fix considering the cold bedroom. This fix will not only warm the bedroom, but also increase energy efficiency and energy savings.

The first step is the inspection of the duct leading from the plenum to the register to be sure it is securely connected. Also, look for holes, crimping, or collapsed areas. Heating ducts damaged by animals is also a possibility that you should be looking for.

Disconnected heating ducts can be reconnected, but damaged heating ducts most often need to be replaced as they are difficult to repair.

Check for a Damper:
The sneaky heating contractor may have placed a damper in the heating duct and kept it a pretty good secret. Look and feel inside the duct by removing the register cover. Also, remove insulation from the outside of the duct, especially near the register and check for the telling signs of a damper. A metal rod with a small handle and a few anchor screws indicate a damper inside. Open the damper and your cool room problems maybe over.

Balance Room Pressure With a Cross Over Duct:
Now we need to talk about room pressure and balloons. Crack the bedroom door open about an inch, turn the furnace on and see if the pressure builds up in the room and closes the door.

The heating system is a circle of air. Air is heated in the furnace, pushed through the heating ducts into a room and then sucked by the same furnace, out of the room, back through the return air duct to the furnace. If the air in the room cannot get back to the furnace, the room builds air pressure, like a balloon, which restricts the flow of conditioned air into the room in the first place.

With an increase of pressure in the bedroom, the conditioned air is forced through a different duct and into an adjoining room.

To fix the potential problem, many homes have cross over ducts installed in the ceiling or over the door that allow the air in the room to get back into the hallway even when the door is closed. In some larger, higher priced homes, they may have eliminated the room pressure problem by installing a return air register in every room.

To balance the room pressure and stop this problem, the two most used repairs are installing a cross over duct through the wall over the door or simply cutting the bottom of the door off so there is a wider gap between the door and the carpet.

Increase the Size of the Duct:
Maybe the Heating Contractor ran out of 8 inch ducting so he decided 6 inch was close enough. There is a real possibility that the back bedroom is cool because the heating duct system was not engineered correctly. When this happens, the best fix is to correct the mistake and replace the duct with a larger one. If the home is fairly new and the Contractor is still around, you might get this done as a freebee.

In this way, the cool room will get a larger share of the air coming from the furnace. This repair can still be a do-it-yourself'er if your willing. Heating duct material, both ridged and flex, can be purchased at your favorite home store. Some zip ties, a few sheet metal screws, a sharp knife and a pair of tin snips should do the trick.

If the heating duct size is simply too small to service the room, besides replacing the duct with a larger one, the only other fix that might work is installing a booster fan in the duct or adding a complete second duct and register.

Duct Booster Fan
Place a baffle in the heating plenum:
This adjustment can be very effective - especially in a manufactured home. A section of the main heating trunk ( the plenum ) needs to be opened up so a metal baffle or shield can be placed in the main trunk line that will direct more air into the heating duct that goes to the cold room. This is a very effective way to grab more of the conditioned air that passes down the main heating trunk and direct it in the direction you want it go. This is an inexpensive and permanent fix that works very well.

Install a Booster Fan in the Duct:
This $30 part won't create more heat, but it will pull more heat to the cool room. The booster fan should be installed as close to the offending room as possible and can be wired directly back to the furnace fan so the booster fan will run each time the furnace comes on. Installing it can be a pain. A section of round metal duct either needs to be dropped down or added to the system. Be sure the duct system is air sealed or this added fan will pull unconditioned air into the system and lower your energy efficiency.

I know dealing with a cold spot in your home can be a frustrating ordeal. Hopefully I have provided some solutions to the problem that will work for you and your home. The home heating system was designed to provide the comfort you are expecting and deserve and, with a little T.L.C., will provide years of energy efficient service.

Thank you for stopping by Detect Energy, hope to see you again soon, but I won't leave the light on for you...Don Ames

What Size Air Conditioner Do I Need for My Home?


So, you're looking to cool your home during the blistering heat of summer and before the autumn chill sets in. While air conditioners are available in many sizes, you're not looking for the largest one-this would be the lease efficient for a standard size home. You're looking to increase the condition of your air and not your power bill, right?

A happy medium, and even happier you
A general rule of thumb is that you will need 1 ton of air for every 500 feet of space you will be cooling within your home. Be weary of smaller air conditioners versus larger ones, as they contain smaller BTUs and will run constantly to try to keep up with your temperature requirements and humidity levels. While you may still feel stale air in your home, you'll also be displeased when you find the power bill is larger than last month.

What about a larger air conditioning unit-will this keep my home comfortable no matter what my square footage may be? Not necessarily, air conditioners tat are too large may cool your home faster, but with that-the humidity in your home is not having enough time to be extracted from the air at the same rate the unit is cooling. You see, they do not call them air conditioners for no reason-they truly condition the air you're breathing and sustain proper humidity levels. Also, the efficiency you lost with the smaller unit is even further gone with a unit too large from your home. Large units cycle on and off more often!

Measuring up to your cooling expectations
If you know the size of the area you want to cool, multiply the length by the width of the area (areas that you are not cooling do not apply). Take that number and multiply it by 25BTU. 25BTU is an umbrella for all types of climate changes, as well as a humid day. For instance, if you have a room that is 12 feet wide by 12 feet long-you will multiply 12x12, which equals 144 sq ft. So, 144x25 = 3600BTU meaning this is the minimum amount of cooling capacity needed for this space. Your cooling professional can perform this equation within seconds and have a number of how many BTUs will cool your home efficiently and effectively.