Solar researcher Dennis Burkholder devised a solar control system that blows heat from his solar heater into his house when he needs it and shuts off when he doesn't.
Schematic for the collector thermostat control system.
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PHOTO 1: This wiring junction connects the fan to the thermostat. PHOTO 2: The upper thermostat is connected to the solar collector. The lower thermostat is the house's main thermostat. PHOTO 3: This blower fan moves air from the collector. PHOTO 4: This thermometer measures the collector's temperature output.