Calculator · Manual J
Size the right system.
Stack the rebates. Quote 3 installers.
Square footage, climate zone, insulation, heating fuel in — sizing, install cost range, 10-year TCO, and three installer quotes out.
Typical home2–5 tonsManual J approximation, rounded to nearest half-ton
Install range$8k–$24kBefore rebate stacking
How big of a heat pump does my house need?
For most US homes, heat pump size lands between 2 and 5 tons. The ElectrifyAtlas calculator takes your square footage, climate zone, insulation level, and current heating fuel, applies a Manual J approximation, and returns a recommended tonnage plus estimated install cost. Final sizing requires a licensed HVAC contractor.
Size your system
Takes a minute. Saves hours on installer calls.
Request installer quotes
Three local installers. Coverage checked before we route.
Frequently asked
Manual J approximation: square footage × BTU load per sq ft (based on climate zone and insulation) divided by 12,000 BTU per ton, then rounded up to the nearest half-ton. For precise sizing, a licensed HVAC contractor performs a room-by-room blower-door test.
All-in installation ranges $8,000 to $24,000 in 2026. Cost scales with system size (tons), tier (value/standard/premium), and local labor rates. ElectrifyAtlas estimates a low/mid/high range from your inputs and subtracts the stacked rebates you qualify for.
Electric resistance heating has the highest replacement savings — typically 60-70% annual energy reduction. Oil and propane are next. Gas has the smallest savings delta but still pays off in states with utility incentives and low electricity rates.
Deep dives
Behind the sizing math
Manual J inputs, rules of thumb vs proper load calculation, and the ton-per-room reality check.
Already sized
Now see what you'll actually pay.
Rebate stacking can drop net install by 40–70% in HEEHRA-active states.