For solar air, my idea was to have an insulated flap to block off the air flow that is connected to a thermostat circuit that also controls that fan to avoid overheating. ...if I can manage to get hot enough to where I'd consider raising the thermostat, I'd be extremely happy. Then again, the thermostat has to go up whenever I have people over for their different comfort needs than mine, so it isn't very high to begin with. If a unit produced around 15k during 'January full sun', I would have had next to zero heating bills all winter outside of the coldest points of the night. I'd have to do some math on that but my sizing is more or less stuck to the size of free glass I can get when I build it.
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