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 average minimum temperature for your area (Use the lower of the 2 numbers in the range given in Fahrenheit).

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 (Out - In) 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	.65
	6 mil poly double layer (inflated)	.70	8 mm (5/16") twinwall polycarbonate	.62
	11 mil woven polyethylene	1.05	10mm (3/8") twinwall polycarbonate	.53
	3 mm (1/8") glass (single layer)	1.13	16 mm (5/8") 5 wall polycarbonate	.33
	6mm polycarbonate roof & glass walls	.90	Polycarbonate / fiberglass (single layer)	1.20

	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 (Out - In) 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	.65
	6 mil poly double layer (inflated)	.70	8 mm (5/16") twinwall polycarbonate	.62
	11 mil woven polyethylene	1.05	10mm (3/8") twinwall polycarbonate	.53
	3 mm (1/8") glass (single layer)	1.13	16 mm (5/8") 5 wall polycarbonate	.33
	6mm polycarbonate roof & glass walls	.90	Polycarbonate / fiberglass (single layer)	1.20

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

- - - - - - - Total Amount of Fuel Used - - - - - - -
Kilowatts of Electricity	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
	<< Type in your 5 digit zip code, and click on Submit. 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

Hobby Gardener Greenhouses		Portable Greenhouse
6' x 8' Enthusiast	241	Hex Greenhouse	358
6' x 8' Silver & Greenline	222
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
EasyGrow Greenhouses
6' x 8'	231	8' x 10'	321
8' x 8'	281	8' x 12'	360
FlowerHouse Greenhouses
14' DomeHouse	645	7' x 7' BloomHouse	305
9' Conservatory	362	6' x 6' HotHouse	145
9' x 9' FarmHouse	335	6' x 6' SpringHouse	177
8' x 8' DreamHouse	247	6' x 6' OrchidHouse	210
Juliana Greenhouses
Basic 300	167	Premium 12.1	435
Basic 450	205	Compact 6.5	247
Basic 600	244	Compact Plus 9.9	359
Premium 8.3	338	Compact Plus 12.1	404
Premium 9.9	387
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
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Buffalo Junction, VA 24529
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