Air Conditioners
Essential Facts
- Efficiency rating (EER) -- The legal minimum is 10. Higher EER ratings equate to lower long term costs but a higher initial purchase price.
- BTU (British Thermal Units) -- Choose BTU level according to the size of the room which you plan to cool. The right BTU level -- not too high or too low -- will ensure proper cooling without exorbitant energy bills.
Buying an A/C Unit
Here are a few helpful hints that will allow you to keep cool for summers come.(Please bear in mind that this article is aimed at those people who desire a window unit air conditioner 
. Central air conditioning systems almost always have to be installed professionally.)
BTU, What Does It Mean?
- Air conditioner cooling capacity is measured in BTUs (British Thermal Units).
- An air conditioner's price is closely correlated with its BTU rating.
- Bigger is not necessarily better - you don't want to buy an A/C that is too powerful for the space you are cooling.
- It will be more expensive than necessary, as well as too cold!
- An overpowerful A/C will also make a room feel uncomfortably clammy.
How Much BTU Do I Need?
- Find the square footage of the room you are trying to cool and multiply by 35. This will give you the ballpark BTUs you should look for.
- Shady room? Decrease that number by 10%.
- Sunny room? Increase that number by 10%.
- Add 4,000 BTUs if you are putting the A/C in the kitchen.
- If more than two people will be in the room regularly, add 600 BTUs per person.
- You might also want to consult this handy page from Energy Star.
Lend Me Your EERs
- EER stands for Energy Efficiency Ratio. A higher number indicates a more efficient unit.
- A higher EER is better (costs less to operate) but units w/ high EER are generally more expensive.
- All air conditioners made after 2000 have an EER of at least 9.7.
- An air conditioner that receives an Energy Star rating has an EER of at least 10.7.
- An increase in EER by one point can save you roughly 10% on your energy bill. Use this estimate when gauging whether a more expensive model will actually save you money in the long run.
Window Size and Installation
- Before you start shopping for an A/C unit, measure your window two or three times for accuracy.
- Make sure that the air conditioner you want will fit in your window.
- Even the lightest air conditioner might weigh more than 40 pounds (roughly 18kg), and a large unit might be close to 100 (roughly 45kg). Keep this weight in mind when you make plans to install it. (You'll probably want to invite a friend or family member to help you.)
- Models that come with a slide-in chassis are easier to install - a framework is installed in the window first, and the heavier air conditioning unit slides in easily.
- This installation takes a bit longer than the conventional air conditioner, however.
- Through-the-wall air conditioners require you to cut a hole in your wall; this is more difficult and is, of course, a permanent installation.
Noise
- Some models run whisper-quiet, others sound like freight trains.
- Quieter models may be more expensive, but if you plan to use the air conditioner in your bedroom, you may want to make the investment.
Warranty
- A warranty is a good thing to have, especially on something as important as an air conditioner.
- Most models come with a one-year warranty; sometimes this can be extended to 4- or 5-year plans.
- If you have someone else install your A/C unit, find out if there is a warranty on the labor as well.
Electrical Outlets
- Before you buy a unit, check the kind of electrical plug that it uses and make sure you have the appropriate outlet in the area you want to use the A/C.
- Most experts recommend running the air conditioner on its own circuit to avoid overloading the electrical system.
Other Features
- Remote Control - particularly useful for air conditioners installed high above the ground.
- Programmable Timer - set it to turn the AC on half an hour before you come home from work.
- Air Direction - for best cooling, figure out whether you need the air to blow to the left or to the right - many models blow better in one direction than the other.
- Temperature Range
- Temperature Increments
- Sleep/Energy Saver Setting
- Slide-out Filter - makes cleaning easier.
- Fan Speed Setting
- Dirty Filter Indicator
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