Bigger is better, right?

Not in the case of air conditioning equipment. If your load calculation indicates a 3-ton heating & cooling requirement and your contractor installs a 4-ton unit for example, you are headed toward high humidity during the summer, increased probability of microbial growth and dust mites in your home. Since the equipment is bigger than what is required, it will come on when the thermostat makes a cooling call, run for a very short period of time to cool the space, then shut off. It will never run long enough to properly dehumidify. The air in your home may be 68 degrees, but it will feel sticky since the humidity levels are now elevated. High humidity makes us more uncomfortable than high temperatures. Ask anyone who lives in Florida. Mold and dust mites require moisture to flourish. Dehumidification removes the moisture they need to live.

How do you determine what size equipment my home needs?

Properly trained HVAC contractors will preform a “load calculation” on your home. This calculation is governed by the Air Conditioning Contractors of America, Manual J, 8th Edition. It is the ONLY way to make sure that your new system is properly sized for your home. The calculation requires taking accurate measurements of your home and collecting data such as window sizes and types, insulation, roofing materials, floors, walls, and even the direction your home faces. If a contractor does not provide you with a written load calculation, he or she is just guessing when recommending equipment for your home. Brown’s Arctic Air performs Manual J Calculations to ensure you are getting the most efficient and right tonnage system for your home.

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