ACF Greenhouse Heaters & Heater Size + Cost to Heat Calculators

Area of Structure - This is the total square feet of exposed surface area (this is not length x width) your structure has (don't include floor). To find out the area of one of our greenhouses, click here. If you have a different greenhouse, click here to use our greenhouse area calculators.

Minimum Outside Temperature - You will want to enter the lowest temperature expected for your area. Not sure? Use the USDA Zone Map to find the minimum temperature for your area.

Inside Temperature - This is the temperature you would want to maintain in your greenhouse when heating.

Heat Loss Value - Check the list below to find the heat loss value for the covering used on your greenhouse. Some values may vary with manufacturer. If you know the R-value of your covering, you can convert it to a heat loss value using this formula: Heat loss value = 1 / R-value.


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Greenhouse Heater Calculators | Area Calculators | Greenhouse Heaters

View Our Selection of Greenhouse Heaters

Greenhouse Heater Size Calculator

Area x (In - Out) x Heat Loss	4 mil polyethylene	1.20	4 mm (5/32") twinwall polycarbonate	.70
	6 mil polyethylene	1.15	6 mm (1/4") twinwall polycarbonate	.62
	6 mil poly double layer (inflated)	.70	6mm polycarbonate roof & glass walls	.90
	11 mil woven polyethylene	1.05	8 mm (5/16") twinwall polycarbonate	.58
	3 mm (1/8") glass (single layer)	1.13	10mm (3/8") twinwall polycarbonate	.53
	Double layer insulated glass	.45	10 mm (3/8") triple wall polycarbonate	.48
	Polycarbonate / fiberglass (single layer)	1.20	16 mm (5/8") 5 wall polycarbonate	.33

	Minimum BTU Needed - This is the minimum amount of BTU output the heater you use should have. If the heater only has a BTU input rating, use the following formula. BTU output = (heater efficiency) * (BTU input). View Our Selection of Greenhouse Heaters
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Note: You need to have Javascript enabled on your browser for the calculator to work.

Greenhouse Monthly Heating Cost Calculator

Area x (In - Out) x Heat Loss	4 mil polyethylene	1.20	4 mm (5/32") twinwall polycarbonate	.70
	6 mil polyethylene	1.15	6 mm (1/4") twinwall polycarbonate	.62
	6 mil poly double layer (inflated)	.70	6mm polycarbonate roof & glass walls	.90
	11 mil woven polyethylene	1.05	8 mm (5/16") twinwall polycarbonate	.58
	3 mm (1/8") glass (single layer)	1.13	10mm (3/8") twinwall polycarbonate	.53
	Double layer insulated glass	.45	10 mm (3/8") triple wall polycarbonate	.48
	Polycarbonate / fiberglass (single layer)	1.20	16 mm (5/8") 5 wall polycarbonate	.33

- - - - - - - Average Amount of Fuel Used Per Month - - - - - - -
Kilowatt Hours of Electricity (kwh)	Gal. of Propane (4.3 lbs. per gal.)	Cubic Ft. of Natural Gas

- - - - - - - Total Amount of Fuel Used - - - - - - -
Kilowatt Hours of Electricity (kwh)	Gal. of Propane (4.3 lbs. per gal.)	Cubic Ft. of Natural Gas

To calculate cost, multiply the figures above by the price in your area for each type of fuel. NOTE: This is only an estimate based on past weather data provided by others but should give you a general idea of fuel costs to heat your greenhouse.
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Note: You need to have Javascript enabled on your browser for the calculator to work.

Figuring the Average Low Temperature for Your Area
Click on the US Average Low Temperature Chart link to find the average low temperatures for your area. Then follow the instructions below.
1. View the temperatures in the "Avg. Low" column for each month. 2. Add the average low temperature of each month with a Lower temperature than inside temperature indicated above. 3. Divide by the total # of months used, and type answer into Average Low Temperature box. -------------------------------------------------------------------------------------------------- Example: You want to maintain 50 degrees. You see 4 months on the temperature chart where the average low temperature is below 50. You add the 4 temperatures together and divide by 4 to get your average outside low temperature. Then, type 4 in the # of Heating Months area below.

Heater Fuel Conversion Chart


	BTUs per hour	cubic feet of natural gas	watts	gallons of propane

Fuel Conversion Factors

1 cubic foot =
0.0102 therms

1 watt =
0.001 kilowatts

1 gallon =
4.2 lbs.

Total Exposed Surface Area

Solar Harvest Greenhouses
SH7	216	SH7ext	80
Grow More Greenhouses
GM8 (8' x 11')	333	GM8ext (8' x 5')	104
GM10 (10' x 13')	442	GM10ext (10' x 6.5')	149
GM13 (13' x 13)	557	GM13ext (13' x 6.5')	175
GM16 (16' x 13')	681	GM16ext (16' x 6.5')	202
Little Greenhouses		Sunshine Greenhouses
Model 8568 - 8.5' x 6.5'	287	GKP64 - 6' x 4'	195
Model 8510 - 8.5' x 10'	359	GKP68 - 6' x 8'	273
Model 8514 - 8.5' x 14'	440	GKP612 - 6' x 12'	352
		GKP812 - 8' x 12'	462
		GKP816 - 8' x 16'	555
FlowerHouse Greenhouses
9' x 9' FarmHouse	335	6' x 6' SpringHouse	177
8' x 8' DreamHouse	247	5' x 5' PlantHouse 5	150
Cross Country Greenhouses
Because of the large number of sizes available, you will need to use our surface area calculator to find the total surface area for the model you are interested in.

View Our Selection of Greenhouse Heaters

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ACF Greenhouses
380 Greenhouse Drive
Buffalo Junction, VA 24529
434-374-2706 Phone, 434-374-2055 Fax
888-888-9050 Toll Free