Free tools
Free HVAC sizing and cost calculators
Quick, transparent estimates for heat pumps, mini-splits, furnaces, AC and boilers. Every assumption is shown, so you can check the math before you quote.
Estimate only. Not a substitute for a room-by-room Manual J.
Calculators
Heat pump sizing calculatorEstimate heating and cooling loads by ZIP code and get a nominal tonnage range.Mini split sizing calculatorPer-zone head sizes from an estimated load, room by room.Furnace sizing calculatorRequired output and input BTU/h, adjusted for AFUE.AC sizing calculatorCooling tons with Manual S oversizing limits applied.Boiler sizing calculatorHot water and steam boiler output, with notes on radiator EDR.Manual J calculator (estimate)A whole-house load estimate with its limits spelled out.Heat pump vs furnace cost calculatorCompare 15-year cost of ownership with assumptions you can change.
Quick answers
What size heat pump do I need?
Typical ranges by house size and climate zone, each with the calculator pre-filled so you can adjust for the actual home.
1,000 sq ft houseWhat size heat pump for a 1,000 sq ft home, by climate zone.1,200 sq ft houseWhat size heat pump for a 1,200 sq ft home, by climate zone.1,500 sq ft houseWhat size heat pump for a 1,500 sq ft home, by climate zone.1,800 sq ft houseWhat size heat pump for a 1,800 sq ft home, by climate zone.2,000 sq ft houseWhat size heat pump for a 2,000 sq ft home, by climate zone.2,500 sq ft houseWhat size heat pump for a 2,500 sq ft home, by climate zone.
When an estimate is not enough
These tools use whole-house rules of thumb and climate data. A real design needs a room-by-room load calculation that accounts for each wall, window and duct run. Our Manual J guide explains what that involves and how to read the report.
Tradewright runs the full room-by-room Manual J from a LiDAR scan or plan, selects real equipment and puts it into a priced proposal. See Manual J load calculation in Tradewright.
Go from estimate to engineered design.
See a room-by-room Manual J, equipment selection and a signed proposal on a real home in 20 minutes.