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.
How Heat Pumps Can Keep You Cool
When people hear “heat pump,” they often think of heating. But a heat pump is just as effective at cooling
May 28, 2026