Heat conservation is first. Seal and insulate where needed.
- Heat only as much as your plants require (this may
feel cool to you).
- Reduce heat loss by using a Heat-Saver
Fan to pull heat off the ceiling.
- Our Prewired
Portable Heater Thermostat will also save heat by accurately turning
your 120 volt heater on and off.
How To Calculate Heat Requirements
The following formula can be used to determine the approximate
heating requirements of your greenhouse: A X D X 1.1 = Btus. 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. "Btus" 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 wall.