conservation is first. Seal and insulate
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only as much as your plants require (this may
feel cool to you).
heat loss by using a Heat-Saver Fan to
pull heat off the ceiling.
Prewired Portable Heater Thermostat will also
save heat by accurately turning your 120
volt heater on and off.
How To Calculate
The following formula can
be used to determine the approximate heating requirements
of your greenhouse: A X D X 1.1 = Btu's. "A" is
the total wall and roof surface area of your greenhouse.
"D" is the difference between coldest outdoor
winter temperature and the night temperature desired
in your greenhouse. "Btu's" is the heat
requirement. Subtract 30% if greenhouse is insulated
using double glazing or polyethylene liner. Subtract
another 30% if it is a lean-to greenhouse on heated