HVAC Calculators

Size air conditioning and heating equipment by BTU for a room or home.

Calculators

• BTU Calculator

Which measurement should I take first?

Start with the room's square footage, ceiling height, and sun exposure — these are the base inputs for BTU sizing. Also note insulation quality and the number of occupants or heat-generating appliances, since both push the required cooling capacity up from the baseline square-footage estimate.