isee;
Don't worry about coming across harsh. We've all been there.
Using solar heated air , if done with cast off "stuff" (stuff=beer cans
or the like ) can pay for the labor in about two winters.
There are quite a few posts here , as well as another site"
http://www.builditsolar.com/ " that can give you real world experiences.
Gary Gary : still posts here sometimes and will certainly answer most questions. He is a very well respected poster and his site is from him doing the actual work with other possible avenues.
Having a wife in the food biz; I can understand the needs for high temps to keep the food within safe temps and the high energy uses that comes along with that too.
Your energy needs may not be typical.
The stainless steel chill table I built for her to temper chocolates, using solidstate peltier devices could certainly be a battery killer!
Best of luck