Determine the right HVAC system size for your home. Enter your details below to see the recommended BTU capacity, tonnage, and estimated cost.
Proper HVAC sizing is critical — a system that's too small won't keep your home comfortable, while an oversized system cycles on and off too frequently, wasting energy and wearing out faster.
Our calculator uses the square footage of your home, your climate zone, and insulation quality to estimate the BTU (British Thermal Units) needed. We then convert to tons (1 ton = 12,000 BTU) and apply system-specific costs.
For the most accurate sizing, a professional HVAC contractor should perform a Manual J load calculation, which accounts for window placement, ceiling height, ductwork, and other factors specific to your home.