It is important that new or replacement equipment is not sized by “Rule of Thumb” or by duplicating the existing equipment capacity. The only accurate way to determine the correct capacity of heating and air conditioning equipment for your home is to have a load calculation performed on your home. There is a specific method available to all dealers to do this calculation. It is called a Manual J Load Calculation. This will give your dealer the heat gain and heat loss design data for your home. These figures can then be used to select the appropriately sized air conditioning or heating system for your home, based on equipment-performance data. This process generally takes about 1- 1 ½ hours depending on the home or amount of comfort concerns the customer might have.

Many factors determine the size (capacity) system your home requires. Some of these are:

  • square feet to be cooled and heated
  • climate
  • humidity
  • number of windows
  • insulation factors
  • which direction your home faces
  • heat producing appliances, and
  • the number of people who will be in the home
  • Oversized air conditioning systems will not remove adequate moisture from the indoor
    air due to short cycling. Also, oversized systems quickly cool the indoor air temperature,
    but they do not run long enough to remove the humidity. That leaves you feeling stuffy
    and uncomfortable. Control of your home’s climate is rarely achieved with oversized
    systems and electricity consumption is higher than with a properly sized system.

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