Understanding load calculation for your home's HVAC

September 25, 2023
Understanding load calculation for your home's HVAC

When investing in a new HVAC system for your home, you may hear the term “load calculation” and wonder what it means. Load calculation takes into account many temperature-influencing factors, from square footage to your home’s windows and appliances, to determine what size HVAC system suits your home best.

The load calculation is how HVAC professionals determine the correct size for your home’s HVAC equipment, whether you’re building a new home or installing new HVAC equipment. Load calculation takes into account many factors and comes up with numbers that represent your home’s total heating and cooling requirements. Load calculation used to depend only on square footage, but the formula has become more complicated and accurate in recent years.

Why Proper Load Calculation Is Important

Your HVAC equipment needs to be the right size to do its job. An AC that’s too small won’t be able to cool down your home, and a too-small furnace won’t keep you warm in the winter. If your AC is too large, it’ll cool too fast to properly remove all the humidity in the air. And a furnace that’s too large will heat too fast, leaving uneven temperatures throughout your house. You’ll end up with higher energy bills because of how often you have to run your HVAC system, too.


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