Quick q for anyone who's explored this before. I'll be asking a builder as well but there's plenty of knowledge to float around here. We're enclosing a porch for a cat litter/'outside' cat room/tiny storage space. It's north facing (in the north) so what I'm hoping is that we can fully enclose it in glass/plexiglass, and not have any venting for heat/cool so we don't have to condition the air in any way. I'm expecting that space still be mostly ambient in the summer/winter which is fine. Am I correct in that assessment? It gets very brief evening sun (maybe an hour or two) but otherwise shaded. Thoughts?