That link is cool, but glass isn't something I'd recommend for the overwintering house. I had a clear triplewall unit before we built the current one, and I learned my lesson about sun, and heat buildup.
But for those of us in colder climates, I think it's something everyone could benefit from. It allows me to work on my trees in the dead of winter, with no worries about it. I also don't have to be concerned with the weather (except for long warm spells) at all. The only thing I do have to do is keep an eye on watering more. I find with the heat mats, I have to water more frequently than my outdoor stored trees.