Greenhouse Heating Cost Calculator

Estimate electricity use before choosing a heater

Heater input in kilowatts multiplied by operating hours and duty cycle gives estimated daily kilowatt-hours. Multiplying energy by the local price per kWh gives cost. A 50 percent duty cycle means the heater runs for roughly half of the available heating period.

Use a realistic seasonal duty cycle. A heater may run almost continuously during a cold night and barely run on a sunny winter afternoon. Insulation, air leakage, thermostat placement, thermal curtains and the crop temperature target all affect runtime.

Compare scenarios instead of trusting one forecast

Run a mild, expected and severe scenario. This range is more useful than a single precise-looking total. The calculator covers electricity only; fuel-fired systems require fuel consumption, appliance efficiency, ventilation and local fuel pricing.

Estimate the required capacity first with the greenhouse heater size calculator, then review the winter greenhouse insulation guide.

Frequently asked questions

What is a kilowatt-hour?

It is the energy used by one kilowatt of load operating for one hour.

Where do I find my electricity rate?

Use the energy charge on a recent bill and consider whether taxes or time-of-use prices apply.

Does thermostat wattage equal heater output?

No. Enter the heater’s electrical input rating.

Reference: The U.S. Department of Energy defines a kilowatt-hour as one kilowatt expended for one hour.