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Greenhouse Heating Energy Cost Estimator

The Greenhouse Heating Energy Cost Estimator calculates electricity use and cost for greenhouse heating equipment from rated power, daily runtime, operating days, load factor, and electricity price. It is intended for electric heaters, heat pumps represented by their electrical input, circulation equipment grouped into a heating load, or any other heating setup that can reasonably be summarized in kilowatts.

The calculator separates connected power from average operating load. A 100 kW system does not necessarily draw 100 kW continuously; the load factor lets you represent cycling or partial-load operation as a percentage of the rated input. The result can support seasonal budgeting and scenario comparison, but it does not model outdoor temperature, greenhouse heat loss, fuel conversion, demand charges, or equipment efficiency beyond what is already reflected in the electrical power you enter.

Heating energy assumptions

kW
hours
days
%
$/kWh
Result
—
estimated heating electricity cost
Energy use—
Average electrical load—
Cost per operating day—
Cost per growing-area unit—

1. Enter rated power
Use the total electrical input in kilowatts for the heating equipment included in the estimate.

2. Set daily runtime
Enter the average number of hours per operating day when the heating system is available to run.

3. Choose operating days
Use the number of days in the season or budget period.

4. Estimate load factor
Represent cycling or part-load operation as a share of rated power; 100% means full rated input for every runtime hour.

5. Enter electricity price
Use your energy charge per kilowatt-hour. Add other tariff components separately if they are not expressed as a simple per-kWh rate.

6. Review energy and cost
Check both total kWh and total cost so changes in runtime, load factor, and tariff are easy to compare.

Average load (kW) = Rated power × (Load factor % ÷ 100) Energy use (kWh) = Average load × Hours/day × Operating days Energy cost = Energy use × Electricity price per kWh

What the result means

The main result is the estimated electricity charge for the entered heating load and operating period.

Demand charges, fixed fees, fuel-fired heating, weather-driven heat loss, and changing tariffs are outside this simple electrical-energy model.

Given: 72 kW rated power, 10 hours/day, 140 days, 60% load factor, and $0.16/kWh.

Calculation: Average load = 72 × 0.60 = 43.2 kW. Energy = 43.2 × 10 × 140 = 60,480 kWh. Cost = 60,480 × $0.16 = $9,676.80.

Result: Estimated seasonal electricity cost: $9,676.80.

The scenario averages about $69.12 in energy charges per operating day.

Does rated power mean heater output or electrical input?

Use electrical input power for an electricity-cost estimate. If equipment is rated only by delivered heat output, convert it to expected electrical input using appropriate equipment data first.

How should I choose the load factor?

Use metered data when available. Otherwise, treat it as a scenario assumption representing the average fraction of rated electrical power drawn during the stated runtime.

Are demand charges included?

No. The formula uses only a per-kWh energy price. Add demand charges, fixed customer charges, taxes, or time-of-use adjustments separately if they materially affect the bill.

Can this estimate natural-gas heating cost?

Not directly. A gas system needs fuel consumption, heating value, efficiency, and fuel price rather than a simple electrical kW calculation.

Why compare kWh as well as dollars?

Energy use shows the physical operating assumption independently of price. It helps distinguish a higher bill caused by more energy consumption from one caused by a higher tariff.