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Calculators
Quick answer: These four calculators give rough planning numbers for heat pump capacity, room-by-room mini-split sizing, seasonal running cost against gas, and unit conversions between BTU per hour, tons and kilowatts. Each shows its formula and assumptions. Use them to prepare for quotes, then ask a licensed contractor for a proper load calculation.
Which calculator should I use?
- Heat pump size calculator: whole-home capacity from floor area, climate and insulation.
- Mini-split size calculator: one room or zone, adjusted for sun, people and kitchens.
- Heat pump operating cost calculator: season heating cost compared with a gas furnace.
- BTU to tons calculator: converts spec sheet units.
How to get better results
Measure floor area of heated rooms only. Pick the climate band honestly; if your winters often reach single digits Fahrenheit, choose cold. For cost, find your actual electricity and gas rates on a recent bill, including delivery charges, and look up heating degree days for your area. Results are estimates, not a substitute for ACCA Manual J or CSA F280.
Worked example
Figures below are illustrative examples (2026-10-29), not quotes or guarantees.
Run the size calculator for a 1,200 sq ft home in a cold climate with average insulation: 1,200 × 45 = 54,000 BTU/h, about 4.5 tons. Convert with the BTU tool: 54,000 BTU/h ≈ 15.8 kW. Bring both numbers to a contractor, who may find a lower load after measuring.
FAQ
Are these calculators free?
Yes, and nothing you enter is stored.
Why do results differ from a contractor's?
Contractors measure walls, windows and leakage; the tools use averages.
Can I use them for commercial buildings?
No. They are designed for homes.