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This is attached to the south side of our house opening into our home with two open doorways.
We heat our house with wood heat, an open air design with a high cathedral roof.
We have an inline fan that gathers the heat from at the top of our ceiling and blows it into the bottom of the sun room. There is a thermostat that regulates the fan turning on if the temperature drops below 18 degrees Celsius.

That is a VERY cool design! Thanks for explaining it.

We had intended a similar design on our house also south facing, but alas, chronic illness nixed that...

Sorry to hear that there is illness preventing you from expanding. It looks like you have lots of growing space with all your windows though.

Yes, due to this being a passive solar heated house, I have a lot of prime windows and make the most use of them that I can. But it would have been nice to have a space devoted to that, so I don't lose so much living space for 4 months every year....

I hear you!