Greenhouse: -21° outside and 65° Inside, 1 by boxcar_grower

boxcar_grower wrote:
Last winter when I decided to heat my Rion 8 x 16 greenhouse I went back and forth on how to do it. I ended up with a direct vent propane heater with a thermostat. The heater rep. said that a 25K BTU would be more than enough and I disagreed. I wanted a 35K BTU. The price difference was peanuts. I used the common greenhouse BTU calculator.

I am sure glad I did.

With my lantana's, hibiscus, veggies, and recently started annual seeds, the greenhouse was warm and toasty this morning. We hit record cold of -21°. The heater has been running in this very cold New England winter coupled with the low December/January sun. This morning was its biggest test. Passed with plently to spare.

If any of you decide to heat your greenhouse, bigger is better if you live in a very cold climate like mine.