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Alan Williams is the founder of SmartHeatSolution.com. He spent years working hands-on with heating and cooling systems while writing SmartHeatSolution.com’s practical HVAC troubleshooting tips and thermostat wiring guides. SmartHeatSolution was acquired by Thermostating in 2024, and Alan’s guides are now part of the Thermostating library and are kept up-to-date by our editorial team.