Hello, I'm new to this forum and am hoping to learn a lot of useful information!
I got my HVAC system for my house replaced a 2 years ago, a Lennox 16-seer system (I don't remember the model numbers off the top of my head). Last night I was sleeping and I hear some odd tone coming from my outside unit and wondered what it could be. The tone can be described as: a high pitch sound gradually getting lower and lower over a 3-second span, make sense? This tone sounds like the fan is slowing down and eventually stopping. A few minutes later I hear it again somehow thought it couldn't be the outside unit of my heat pump, because hot air was still blowing out in the house. A few minutes later, again and again all night. Occasionally, it would "sound" like it was normal because it would not shut on/off repeatedly.
Maybe I haven't noticed it until now, but is this normal? I don't want to call a tech over if this is normal behavior of a typical system.
The system (or at least my heater) still works great though.