36000 BTU to Tons
Updated
Convert 36,000 BTU/hr to three refrigeration tons with small-house sizing guidance, central equipment details, EER electricity math, and FAQs.
Direct answer: 36,000 BTU/hr = 3 tons.
Quick converter
Tons of refrigeration
36,000 BTU/hr = 10,550.56 W of thermal capacity. Updates as you type.
36,000 BTU/hr is exactly 3 refrigeration tons, a common capacity for central air conditioning and larger heat pumps. Three tons can be a reasonable starting point for a small whole house, but tonnage is only the heat-removal rate. Electrical input, duct design, humidity control, and the climate determine how that capacity behaves in service.
The formula is 36,000 / 12,000 = 3 tons. The same capacity is 10.55055852 thermal kW. At EER 11, 36,000 / 11 = 3,272.73 W, about 14.2 A at 230 V, and 26.18 kWh for eight steady hours; use MCA/MOCP rather than the rounded current for protection.
Worked example
- 1. Start
36,000 BTU/hr
- 2. Apply the formula
36,000 / 12,000
- 3. Round the result
36,000 BTU/hr = 3 tons
Practical guidance
Three tons in a house
A rough 1,600–2,400 square foot range may fit three tons in moderate weather and average construction. That guide cannot account for a glass wall, attic heat, duct leakage, or a large kitchen by itself. A whole-house load calculation decides capacity room by room and also informs supply and return airflow.
Central and multi-zone alternatives
A 3-ton central split or packaged unit is the familiar installation, while a 36K outdoor heat-pump unit can feed multiple indoor zones. Three 12K heads are one possible split, provided the manufacturer permits that combination and the rooms' loads align. Component matching and duct balance prevent a nominally correct system from performing poorly.
Electrical efficiency comparison
For 36K capacity, EER 9 means 4,000 W input, EER 11 means 3,273 W, and EER 13 means 2,769 W. Thus two three-ton systems can have the same capacity but different service and operating costs. Most equipment at this size is 230 V; follow the exact nameplate's MCA, MOCP, disconnect, and wire requirements.
Heating, staging, and moisture
A three-ton heat pump's heating output can fall in cold weather, so read the low-temperature table before treating it as a furnace replacement. Variable-speed or two-stage controls can match spring and fall loads better than a fixed oversized stage. In humid climates, excessive capacity can shorten cycles and leave indoor moisture even when the air feels cool.
A transparent bill example
At EER-11 input, eight hours at the rating condition uses 26.18 kWh. At $0.15 per kWh, the arithmetic is 26.18 x 0.15 = $3.93. That is a comparison example, not a promise of daily cost; outdoor temperature, cycling, fan schedules, and tariff structure dominate actual bills.
Common mistakes to avoid
- Confusing three tons with 3 kW of electricity
- Assuming a square-foot rule replaces a load calculation
- Ignoring duct balance and low-temperature heat output
- Using running amps for breaker selection
36000 BTU to Tons chart
| BTU/hr | kW | Tons | HP |
|---|---|---|---|
| 9,000 | 2.638 | 0.75 | 3.537 |
| 12,000 | 3.517 | 1 | 4.716 |
| 18,000 | 5.275 | 1.5 | 7.074 |
| 24,000 | 7.034 | 2 | 9.432 |
| 30,000 | 8.792 | 2.5 | 11.79 |
| 36,000 | 10.551 | 3 | 14.149 |
| 48,000 | 14.067 | 4 | 18.865 |
| 60,000 | 17.584 | 5 | 23.581 |
Common questions
How many tons is 36,000 BTU/hr?
It is exactly 3 refrigeration tons because 36,000 / 12,000 = 3. The term describes cooling capacity, not equipment weight.
What is three tons in thermal kW?
Three tons equals 10.55055852 thermal kW, commonly rounded to 10.551 kW. This is separate from electrical input.
How much input at EER 11?
36,000 / 11 = 3,272.73 W, or about 3.273 kW at the rating condition. Check the product data for fan and control power.
What current is that at 230 V?
The simple arithmetic is 3,272.73 / 230 = about 14.2 A. MCA, MOCP, startup current, and local code control the installation.
How much energy is eight hours?
Continuous EER-11 operation would use 3.27273 x 8 = approximately 26.18 kWh. A variable-speed or cycling unit may use less in ordinary weather.
What area can three tons serve?
Roughly 1,600–2,400 square feet is a moderate-condition starting guide. A load calculation decides after accounting for climate, insulation, glass, ducts, and occupants.
Can 36K be split into three 12K zones?
Yes when the outdoor unit is designed for three compatible 12K heads and the simultaneous demand fits its operating range. Zoning improves control but cannot fix an incorrect whole-house load.
Is a three-ton system always 230 V?
Most central and ductless 36K systems are 230 V, but voltage and protection vary by model. Read the nameplate before ordering electrical work.
More size guides
Continue with the BTU to kW converter, compare BTU/hr to tons of refrigeration, or check the BTU to horsepower converter.