Don’t Neglect Load Calculations When Upgrading HVAC Equipment

Don’t Neglect Load Calculations When Upgrading HVAC Equipment

Don't Neglect Load Calculations When Upgrading HVAC EquipmentMost people are careful to avoid installing an under-sized HVAC system in their house, knowing that it will struggle to keep them comfortable on the hottest or coldest days. However, it’s also important to avoid over-sized systems. They operate inefficiently, are more prone to breaking down, and aren’t as effective at removing moisture from the air in the summer. To appropriately size your HVAC system, your contractor will need to calculate the heating and cooling loads of your home. In figuring a load calculation for your Georgia home, your contractor should remember these basic rules:

  • Don’t use simple “rule of thumb” methods. There is no way to ensure the results will be accurate. Nowadays, the old way of doing things is even more likely to be inaccurate due to the improved energy efficiency of most homes as a result of better insulation and air sealing.
  • Use the correct tools. The contractor should employ the Air Conditioning Contractors of America’s Manual J, a software protocol that allows technicians to perform load calculations according to the industry standards. The results of Manual J are not only used to determine the correct size cooling or heating equipment for your home; they’re also used with Manual D to ensure your ductwork delivers the right amount of heating and cooling to each room.
  • Don’t guess on the initial values. Get detailed information when figuring the basic values that are factored into load calculations – cubic footage of your home, the amount and type of insulation, airtightness, etc.
  • Keep in mind the three categories calculations fall into. Local climate and home orientation are examples of design considerations; insulation and air sealing are examples of the thermal enclosure; duct losses and heat generation from appliances and occupants are examples of internal loads.

If you want to ensure your home’s load calculations are done correctly, please contact the professionals at Powers Heating & Air. We provide quality HVAC services year-round in Peachtree City and the surrounding area.

Our goal is to help educate our customers in Peachtree City, Georgia and surrounding areas about energy and home comfort issues (specific to HVAC systems).

Image courtesy of Shutterstock


  1. […] Your reliable HVAC contractor should perform a Manual J calculation to determine your home’s correct cooling load. This will also pinpoint areas in your home where you can improve energy […]

  2. […] a proper load calculation and system sizing with Manuals J and S, you’ll have the perfect air conditioner that optimally […]

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