I have a Harbor Freight 10'x12' greenhouse that we heavily fortified for our midwest winds and storms. We added self-tapping screws, silicone, extra panel clips, etc. to ensure strength.
Now...we need heat for our winters.
We've tried basic heaters with fans in order to heat, but they do not even come CLOSE to doing the trick.
I need some ideas on how to heat this size of a greenhouse in the cheapest manner possible. There's no way for us to pull everything out to run floor heat, water drums, etc., so I need something that will be as energy efficient as possible with probably propane or natural gas.
Ideas? PLEASE!?!?
