Farm Wholesale Greenhouses: your source for hobby greenhouse kits and supplies, utilizing corrugated plastic panels and steel reinforced pvc framing.
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    Heater Calculator

    If you live in a cool region, you'll probably need to purchase a greenhouse heater. Heaters are rated by the amount of BTU's they produce. You may be wondering, how do I find the right heater for my greenhouse? In order to determine the correct size of heater you'll need, you'll first need to gather some information on the size of your greenhouse, the minimum outside temperature you expect for your area, and the minimum temperature you want to maintain in your greenhouse.

    Use the JavaScript Greenhouse Heater BTU Calculator to determine your heater needs:

    JavaScript Greenhouse Heater BTU Calculator
    Do This JavaScript Calculator Example (consider our 8' Oasis Greenhouse)
    find the total square feet of exposed surface area of your greenhouse. 9 sheets of corrugated plastic (at 4x8 sheet) would be 9 x 32 = 288 sq.ft.
    determine the maximum inside temperature you want to keep your greenhouse at. you're growing seedlings, so you want the inside temperature to stay at 60 degrees f.
    determine the minimum outside temperature you expect for your area. you live in oregon, and you expect temperatures to be down to 20 degrees f this winter.
    determine the heat loss factor for the greenhouse covering material. corrugated plastic has a heat loss value of .48
    multiple the square feet by difference in temperatures, then by the heat loss factor. the total square footage of the covering surface area is 288. the temperature difference is 40 degrees f (60 degrees f minus 20 degrees f). the heat loss factor is .48
    this is the minimum heater btu rating to keep your greenhouse at the desired temperature during the coldest time of year. 288 x 40 x .48 = 5529.60

    Our Electric heater provides 5,118 BTU's to heat your greenhouse. Our Non-vented Gas Heaters provide 20,000 BTU's for those larger greenhouses.


    Farm Wholesale Greenhouses
    3740 Brooklake Road NE
    Salem, OR 97303    		 call toll-free (800) 825-1925
    email: greenhouse@farmwholesale.com
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    www.farmwholesale.com