BTU Heat Load Estimator
Rough BTU/hour cooling or heating load estimate for a room from area, ceiling height, insulation, and sun exposure.
Is this a real HVAC sizing calculation?
No — this is a rough, educational estimate, not a Manual J load calculation. A real HVAC contractor accounts for climate zone, window area/type, occupancy, and appliance heat. Use this to sanity-check a quote, not as the sole basis for buying equipment.