Hi everyone,
I'm looking for advice from those experienced in heating and insulating greenhouses for winter. I just bought myself a big, nice greenhouse. Nice as it is, I will still need to heat it. I'm shopping for an electric heater, and am wondering if anyone has any tips or recommendations. My greenhouse is 8' x 20' with an R value similar to single-pane glass. From my calculations I'll need a heater that puts out about 20,000 BTU/hr.
My concerns are as follows:
Will I be better off with two smaller heaters instead of one large one? As in... one in each corner of the greenhouse? Or will a heater on one end with a fan be sufficient? I don't want any cold spots. I'm considering 1 King Pic-A-Watt 240v Electric Heater, or two Dayton U36 Heaters. I found them here:
http://www.littlegreenhouse.com/accessory/heaters3.shtmlWill too high a wattage dry my plants out?
Will greenhouse humidity kill electric heaters too easily?
I'm also looking into bubble insulation. Any knowledge on that topic will be appreciated as well. I'm concerned that with the insulation, enough light won't be able to pass through when it's dark and overcast here for a few months.
Thank you all, as always!