Nope. Meant what I said. It is inexpensive cheapo ~ 8 x 8 x 10. If it is -15 outside, it is -10 or so in there. I have seeds started in mid summer in it. Early Spring and late Summer-Fall I have plants in it. I do use it that whole time. From November when I put everything to bed til mid April or so, I use it for storage and keep a few potted plants there. Not many.
During the hottest summer period it has shade cloth covering it. I start a lot of perennials over summer in it. On our hottest days this year, it was between 90 - 100 in there.
Seed seems to not be available anywhere. Oh well.