Your thermostat gives you a choice–fan on, off, or auto. What’s best? Harold Wilkes says leave it on all the time if your furnace and/or AC has a DC variable speed motor. If not, you can still leave the fan running for extended periods during the day. But why not just leave it on auto? Turns out there is a reason, and Harold explains why in this quick video.
A Tiny White Ball and an Open Mind
Mechanical Extremes owner Harold Wilkes regularly solves HVAC problems that stymie others. That...