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Free Greenhouse Supplies
Greenhouse Heater Calculators | Area Calculators | Greenhouse Heaters

View Our Selection of Greenhouse Heaters

Greenhouse Heater Size Calculator
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.
 Area x
(In - Out)
x Heat Loss

4 mil polyethylene
1.20
4 mm (5/32") twinwall polycarbonate
.70
6 mil polyethylene
1.15
4 mm roof & single poly walls (EasyGrow Clear View)
.95
6 mil poly double layer (inflated)
.70
6 mm (1/4") twinwall polycarbonate
.62
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
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
.
Note: You need to have Javascript enabled on your browser for the calculator to work.
Greenhouse Monthly Heating Cost Calculator
Area of Structure - Same as above. Our greenhouses are listed below. Click here if you need to use our area calculators.
Inside Temperature - This is the temperature you would want to maintain in your greenhouse when heating.
Average Low Temperature - Click here to find the average outside low temperature in your area.
# of Heating Months - Number of months used to determine the Average Low Temperature above.
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.
 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
.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 - - - - - - -
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.
.
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
Aspen Greenhouses
7' x 7' 221 9' x 9' 336
7' x 9' 262 9' x 12' 387
    9' x 14' 432
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' Conservatory 362 7' x 7' BloomHouse 305
9' x 9' FarmHouse 335 6' x 6' HotHouse 145
8' x 8' DreamHouse 247 6' x 6' SpringHouse 177
5' x 5' PlantHouse 5 150 6' x 6' OrchidHouse 210
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


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