Proper installation can dramatically impact how effectively home AC units operate, so it is worth researching who you have doing the work. This is not a good candidate for a do-it-yourself project even though it is possible to buy air conditioners wholesale. There are necessary EPA certifications to consider because of the refrigerant used. Installation also involves some rewiring and anchoring the unit to a concrete pad. Look for someone specifically licensed to do the installation.
How to Size AC Units for a Home. The size of a home AC unit is measured in Btu, or British thermal units. In order to determine the proper size, you need to know the size of your home, how your home's rooms are used and the structure of your home. When you choose an AC unit for your house, you want one that is as close to the size you need as possible. Bigger is not necessarily better, because an AC unit that is too large will waste energy, and can result in insufficient dehumidifying of the inside air. Buying an AC unit with the Energy Star label will save you money because it uses less energy.