I'm trying to make my porch into a seasonal "greenhouse". I'm finishing up building my little house, and I'm in Texas so a big porch was obviously very important. Now I'm working on gardening; I made a greywater bed (kind of like the earthship design) spanning the whole front length of my porch, facing SE. Because its so hot here most of the time, and constantly getting water, I put a bunch of tropical food in there, and everything is growing beautifully.
Now, I know these plants can't handle a freeze. It freezes here maybe a few nights (for only a few hours) in the winter, if that. I guess I could just put a blanket on em and they'd be fine. But, I'd be way happier if I could keep my porch/garden warmer than just "not freezing", not to mention the plants.
I'm looking into roll up vinyl curtains (too expensive, but I have sewing skills so maybe can make my own), or maybe can collect enough old windows to make removable "panels" and store em under the porch for the summer. I know these options won't provide any insulation, so then I wonder about supplemental heat without racking up the utility bills?
I'm trying to balance ease of changing between seasons with durability and R-value. It'd be a dream if I could keep it up to 40 or 50 in the porch garden on a cold night. Any thoughts?
(Pardon the messy picture, its a work in progress)