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...
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Doug, are you by chance an RV Tech? You seem very knowledgeable and have helped a lot of of folks here including the OP. :)
