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Thread: Greenhouse heating calculation correct?

  1. #1

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    Greenhouse heating calculation correct?

    So I plugged in some information on heating a greenhouse with natural gas in my area. My natural gas is $ 4.3070 per mcf (mcf=1000 cubic feet). The calculator I used says I'd use 6510 cu ft of natural gas per winter season. Is it naive to believe that that means I'd only use $28 worth of natural gas in an entire season? I'm not the best at math so please feel free to correct me! Just shocked at how little that actually is!


    http://www.littlegreenhouse.com/heat-calc.shtml


    The stats I used were: 165 sq ft greenhouse made with 6 MIL polyethylene (heat lost of 1.15), heated to 40F for 5 months out of the year at an average low temp of 22F.

  2. #2
    Tony C's Avatar
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    I'm guessing that your greenhouse measurement is off unless you have a tiny greenhouse. The calculator requires the total square footage of all exposed surfaces (walls and roof), not the floorspace.

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    Whimgrinder's Avatar
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    Here in the PNW (a mild zone 8a), from December through March it costs me approximately $40 a week to heat my 11 X 16 foot greenhouse with propane. On cold nights I do supplement the heating with a small electric space heater, as needed.

    Unless your greenhouse is no more than a 3 foot cube, I very much doubt your figures are accurate.

    PS: what are you planning on growing that doesn't require temps over 40F? And where are you located? You've supplied zero information about your geography.
    Last edited by Whimgrinder; 07-15-2013 at 08:42 AM.

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