First off, it is important to understand that size really does matter. A unit that is too small will continuously run, will not be able to keep up on hottest days, and will ultimately increase your energy consumption. On the other hand, in addition to what was stated above, an air conditioner that is too big will cost more to run, will cycle on and off frequently, and will not provide consistent cooling. You may be tempted to look at your existing unit to determine the right size, that is very often an unreliable method.
In order to figure out the correct size unit, an air conditioning installer must calculate your home's heat load, which is essentially how fast your house heats up. Factors to consider is the home's overall volume, the exterior area exposed to direct sun, and the number and condition of your windows. Also considered are the age and overall condition of the house, the type of insulation in the walls and attic, and any existing ductwork. Even the type of roof you have has an impact.
When you know your home's heat load, you then know exactly how much cooling power you need. Regardless, this is not something that can be done by the average homeowner or some online calculator. Only a qualified and professional air conditioning installer knows what to look for and has the software to make a precise calculation. Installing a new air conditioning unit is just one of those home repair projects that a person cannot do on their own.
JR Perkins is the first heating and air conditioning company in the East Valley, located in Scottsdale AZ. To learn more please visit our website at www.JRPerkins.com or call (480) 422-4437.