Heating a 40 x 25 greenhouse (double poly)
I start all my tender plants (tomatoes, peppers, etc) on April 1st. Our mean lows are 30*F in April, but it can get as low as 0*F on the coldest nights. I would need to maintain an interior temp. of 50*F.
The only heating system I have is electric. I have a 100 amp panel with 15 amp circuits.
I looked at the heating requirements for a greenhouse of this size and it appears that six 1500w space heaters are insufficient to maintain 50 F on cold nights.
I am going to use heating pads for the seedling trays both during and after germination. Besides this, are there any ways in which I can keep the plants warm after they have germinated? Would convection-type heaters placed below the benches help?