6 Ton Heat Pump Wattage Calculator

Calculator Inputs

System capacity (tons)

Efficiency input method

Efficiency value

Custom running watts

Load percentage

Supply voltage

Power factor

Phase type

Single phase

Three phase

Runtime hours per day

Operating days per month

Electricity rate per kWh

Startup multiplier

Reset

Formula used

Capacity conversion: 1 ton = 12,000 BTU/h = 3.51685284 thermal kW.

EER method: Running Watts = (Tons × 12,000 × Load Factor) ÷ EER

COP method: Running Watts = ((Tons × 3.51685284 × Load Factor) ÷ COP) × 1000

kW per ton method: Running Watts = Tons × kW per ton × 1000 × Load Factor

Custom method: Running Watts = Custom Watts × Load Factor

Single phase current: Amps = Watts ÷ (Voltage × Power Factor)

Three phase current: Amps = Watts ÷ (√3 × Voltage × Power Factor)

Energy and cost: kWh = kW × Hours, and Cost = kWh × Electricity Rate

How to use this calculator

Enter the system size. It defaults to 6 tons, but you can change it.
Choose your preferred efficiency input method: EER, COP, kW per ton, or custom running watts.
Set the operating load, supply voltage, power factor, and phase type for your installation.
Add runtime hours, monthly operating days, electricity rate, and a startup multiplier if you want demand estimates.
Press Calculate Wattage to view watts, amps, kWh, costs, startup demand, and the load graph. Use the export buttons to save the results.

Example data table

System Size	Method	Efficiency Input	Load	Estimated Running Watts	Estimated Amps @ 240V, PF 0.95
6 ton	EER	10.0	100%	7,200 W	31.58 A
6 ton	EER	12.0	100%	6,000 W	26.32 A
6 ton	COP	3.2	100%	6,594 W	28.92 A
6 ton	kW/ton	1.15	100%	6,900 W	30.26 A

These sample values are illustrative. Field conditions, inverter behavior, ambient temperature, and manufacturer controls can change actual power draw.

Frequently asked questions

1) How many watts does a 6 ton heat pump usually use?

Many 6 ton systems run roughly between 6,000 and 8,500 watts under typical loaded conditions. Actual draw depends on EER, COP, inverter speed, outdoor temperature, duct static pressure, and electrical characteristics.

2) Does 6 tons mean the unit uses 6,000 watts?

No. Tons measure heating or cooling capacity, not electrical input. One ton equals 12,000 BTU per hour of thermal capacity, while wattage depends on system efficiency and operating load.

3) What does kW per ton mean?

kW per ton expresses electrical demand for each ton of delivered HVAC capacity. Lower values generally indicate better efficiency. Engineers often use this figure for quick benchmarking and equipment comparisons.

4) Why is startup wattage higher than running wattage?

Compressors can draw extra current for a short period during startup. That temporary surge raises watts and amps above steady-state operation, which matters for generator sizing, breaker selection, and feeder design.

5) Which is better for this calculator, EER or COP?

Use whichever value you have from the equipment data. EER is common for cooling performance, while COP is often used for heat pump efficiency. Both methods can estimate input wattage correctly.

6) Does changing voltage change the wattage result?

Voltage changes the calculated current, not the thermal demand itself. For a given wattage, higher voltage reduces amps. That is why voltage is important for wire, breaker, and panel planning.

7) Why does power factor matter in the amps calculation?

Power factor reflects how effectively electrical current converts into useful power. Lower power factor increases current for the same wattage, which can affect conductor sizing, voltage drop, and equipment loading.

8) Can this calculator estimate monthly operating cost?

Yes. Enter runtime hours per day, operating days per month, and your electricity rate. The tool multiplies energy use by the entered tariff to estimate daily, monthly, and annual operating cost.