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Central Air Conditioning Sizing

Monday, March 24th, 2014 at 1:14 pm

One of the crucial steps involved in new air conditioning installation takes place before the new unit arrives at your home: sizing the air conditioner. The efficiency of an AC—how well it converts electrical power into cooling power—is an important factor in deciding what type of air conditioner to install. But just as important is the size and power of the AC. If the installers place a unit that is too small or too large for your home’s cooling needs, the efficiency rating will not matter: the air conditioner will drain energy and break down early from excess strain.

To properly size your air conditioning system, the installers will perform a check on your house to see how it gains and traps heat. This way, they will know how powerful an AC is need to perform the job of combating the heat without short-cycling (cooling down too fast). Our Melbourne, FL AC technicians at Next Generation Air & Heat Inc. will look at all the following to size properly your air conditioning:

  • Heat gain from lights, motors, and appliances: The outside weather and sun aren’t the only sources of heat you’ll deal with during the summer. Devices inside your home produce large levels of heat, particularly lights and appliances that remain on most of the day.
  • Rates of heat gain from occupants: Another source of heat in your home you may not have considered: the people who live there. The more warm bodies who inhabitant your home, the more the air conditioner must work.
  • Solar heat gain from windows: The windows of your home are the spots where radiant heat from the sun has the easiest time infiltrating to the inside. To size your AC, the installers must calculate how much heat enters your home from the windows, taking into account their compass facing and their interior shading.
  • Attic heat and insulation: The attic of a home serves as a major heat sink during the summer, often rising above 120°F on the hottest days. This heat will seep down into your house, and the better insulation you have in the attic, the less this extra heat will raise the home’s interior temperature.
  • General insulation: The installers need to know how well your house’s walls are insulated against heat entering through conduction and convection.
  • Basic climate conditions: What sort of temperatures will your house normally encounter during the summer? You may receive harsher or lighter heat depending on how your house is situated.

There’s even more that goes into sizing than this, but the above factors should give you an idea of how much work it takes to find the right sized AC. Make sure to call trained installers, like those at Next Generation Air & Heat Inc., to help you select the ideal air conditioning for a Melbourne, FL.

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