It's my drawing, only took half an hour or so, which is okay, 'cause it is also our greenhouse, or our greenhouse as I hope it is in a few months.

We bought it as a kit about a decade ago. It is a redwood frame with glass on the vertical glazing. The roof used to be single sheet fiberglass, but after several years at this elevation it had started to fall apart. I replaced it last year with polycarbonate double wall, which is really nice, and easy to work with.

This winter, I want to dig out the floor and put in something like this, with the ability to extend it to the raised bed gardens that are nearby. I think that with a cover over the raised bed we can be getting greens all winter (I've seen it done) and with the soil heating, can even enhance that. The greenhouse gets hot even in the winter, I want to harvest that heat by storing it in some sort of thermal mass. I usually have to use a mineral oil radiant heater during the winter, which consumes too much juice.