In this troubleshooting situation, we have a customer who has called to say that their 12,000 Btu through-the-wall unit is “blowing cool air even though it’s set for heat.” Here’s the unit’s profile: ...

Figure 1. This is the circuit board from the service call. Note that the four-way valve connections are on the bottom right of the board. Tim followed the wire from the valve to the RV terminal and ...

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The garage got hot in the summer, too, but I solved that problem with solar-powered ventilation fans, plus a cheap air conditioner for the really hot days. Murilee Martin Insulation and paneling ...