229. Humming Noise in HVAC Unit
28 Jan 2026 · 1 min
A humming HVAC unit that won't start usually means a failed capacitor. Running it risks burning out the motor. Kill the power and replace the capacitor, possibly the motor too.
Chapters
Foreign. Hey, this is Derek Cole. Welcome to the Derek Cole Podcast. Thank you so much for listening. And the majority of this podcast come from clips of videos with Q and A sessions. Sometimes I put the clip, sometimes the whole show. But usually the clips are kind of bite sized pieces, so you don't, you know, have to listen to me all the time for, you know, seven, 10 minutes. But these are helpful clips and I hope you enjoy it. Again, let's get right into it.
Think about a spinning a ball on your finger. You know, a basketball. The basketball would be the motor and your hand would be the capacitor. So for the motor to keep spinning, you need the capacitor. So once that capacitor has failed, the ball falls, the motor doesn't run. You get a humming noise where it's trying to start, wants to start, it might even get hot, but it can't do it because the capacitor is not allowing it to do it. So that sounds like a capacitor problem. But I would, if that is happening, I would not try to run the unit because you don't want to further damage the motor by not running, by getting hot and then the motor going out. So then you have a motor and a capacitor. So as soon as you see that happening or know that's going on, make sure you kill the power to the unit. Stop the unit, make sure you don't run it because you don't want to cause any further damage.
Hey, guys, hope you enjoyed this episode of the Derek Cole Podcast. Did you like it? Did you love it? Share it with somebody and pass on the word. If you want to see more of this, you can always go to Simmons One Hour Comm. That'll lead you to all of our social links and our YouTube page. Thank you so much for listening and we'll see you next time.
More from Derek


713. Fan "On" or "Auto"? The Thermostat Setting That Could Be Making Your Home More Humid


712. Why Is My Upstairs Always Hotter Than Downstairs? The Truth Every Homeowner Should Know