How are heat pump tons calculated here?
Tons = estimated cooling BTU/hr ÷ 12,000.
Enter room or home size, ceiling height, climate zone 1–5, and insulation quality. The primary result is heat pump capacity in tons, with cooling and heating BTU/hr shown together.
Cooling load uses zone cooling factors (for example zone 3 = 25 BTU/sq ft). Heating load uses zone heating factors (zone 3 = 35 BTU/sq ft). Both apply the same insulation and ceiling-height adjustments. Tons = cooling BTU/hr ÷ 12,000.
Use the estimate to compare equipment ranges. It does not model heat-pump balance point, auxiliary heat staging, or Manual J room-by-room design.
Concise answers for common searches — definitions, steps, and comparisons.
Tons = estimated cooling BTU/hr ÷ 12,000.
12,000 BTU/hr of cooling capacity.
Cooling and heating BTU/hr are computed from floor area, climate-zone factors, insulation, and ceiling height. Tons = cooling BTU/hr ÷ 12,000.
Formula
coolingBtu = round(sqFt × zone.cooling × insulationFactor × (ceilingFt ÷ 8)); heatingBtu = round(sqFt × zone.heating × insulationFactor × (ceilingFt ÷ 8)); tons = coolingBtu ÷ 12,000. Cooling factors: 1→30, 2→27, 3→25, 4→22, 5→20. Heating factors: 1→25, 2→30, 3→35, 4→40, 5→45.Choose imperial or metric units. Use length × width or switch to area mode for total heated/cooled square footage.
Enter ceiling height in feet. Results scale from an 8 ft reference height.
Select zone 1–5 and poor, average, or good insulation to reflect climate and building envelope.
Primary capacity is in tons. Review both cooling and heating BTU/hr to see whether heating or cooling dominates for your zone.
Input
20×15 ft · 8 ft · zone 3 · averageOutput
0.6 tons · 7,500 cooling / 10,500 heating BTU/hrCooling 300×25; heating 300×35; tons = 7,500 ÷ 12,000.
Input
2,000 sq ft · 8 ft · zone 3 · averageOutput
4.2 tons · 50,000 cooling / 70,000 heating BTU/hrCooling 2,000×25; heating 2,000×35; tons = 50,000 ÷ 12,000.
Common real-world scenarios where this tool saves time.
300 sq ft, 8 ft ceiling, zone 3, average insulation → about 7,500 BTU/hr cooling (0.6 tons) and 10,500 BTU/hr heating.
2,000 sq ft, zone 3, average insulation → about 50,000 BTU/hr cooling (4.2 tons) and 70,000 BTU/hr heating.
Same 2,000 sq ft in zone 5 raises heating toward 90,000 BTU/hr while cooling falls—use heating BTU when discussing supplemental heat.
Step-by-step chains that connect related tools for common tasks.
Estimate dual-mode heat pump capacity, then compare furnace heating BTU if evaluating fuel options.
| Zone | Cooling | Heating |
|---|---|---|
| 2 | 27 | 30 |
| 3 | 25 | 35 |
| 4 | 22 | 40 |
| 5 | 20 | 45 |
Use cooling tons for AC capacity talks and heating BTU/hr when discussing heat-pump output or backup heat needs.
Cold-climate performance, balance point, and auxiliary heat are outside this estimate—verify before purchase.
Compare the reported heating BTU/hr as well—cold zones often need more heat than cooling tons imply.
This is a square-foot estimate. Contractors use Manual J/S for equipment selection and warranties.
Poor vs good insulation changes both cooling and heating BTU on this calculator—match the building honestly.
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Primary capacity is cooling tons from the estimated cooling load. The panel also shows cooling and heating BTU/hr so you can compare both modes.
Yes. It computes both loads from the same area, climate, insulation, and ceiling inputs. Tons are derived from cooling BTU/hr ÷ 12,000.
Each zone has separate cooling and heating BTU-per-sq-ft factors. Hotter zones raise cooling; colder zones raise heating.
No. Oversizing can hurt efficiency and humidity control. Use this as a planning range, then refine with Manual J/S.
No. It does not model auxiliary heat strips or outdoor-temperature capacity loss. Discuss those with a qualified installer.
For new installations, replacements with warranty/permit requirements, or complex homes. This page is a planning estimate only.
Heat pump sizing measurements and climate selections remain local — EverydayTools does not collect heat-pump-size calculator entries.
Estimates only — not professional HVAC or energy audit advice. Verify with a licensed contractor before purchasing equipment.
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Reviewed on 2026-06-28.
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Standard ceiling is 8 ft