HVAC Sizing Check

How it works

For homeowners wondering what size air conditioner or heat pump they need, and HVAC salespeople double checking a quote. Enter the home's conditioned square feet, the climate, how well it's insulated, the ceiling height, and the size of the current or quoted system in tons. HVAC Sizing Check works out a rough range using the square feet per ton rule of thumb for your climate, adjusted for insulation and ceiling height, rounds it to the half ton sizes equipment comes in, and tells you whether the system looks about right, oversized or undersized. It explains why size matters (short cycling, humidity, comfort, wear and higher bills) and what to do next. It's a quick check, not a Manual J load calculation, and it says so: a proper replacement should be sized with one.

A rule of thumb, not a Manual J load calculation.