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cannesdo's avatar
cannesdo
Explorer
Jul 31, 2015

A/C just started making a deep hum...

I installed a 2nd A/C in the bedroom last summer, a Mach 8. I replaced the fan blade to make it quieter and it's worked great all year. But just recently...just as you're turning the A/C on it sounds normal for a second then this deep hum starts in. It feels like a vibration. You can feel it in the floor. Seems like something might be loose. Do they need tightening after awhile when you first install them? If so, what...the main bolts that secure it to the roof? I got it screwed in so tight when I first installed it. Waited a bit for it to adjust, then tightened it some more. Repeated this until it wouldn't turn anymore. Hard to believe it could be that.

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