10/30/2026
It's Halloween, so we'll say it: the noise coming from your rooftop unit is not a ghost.
It's a mechanical problem that hasn't failed yet. Equipment usually makes noise before it stops working, and most of the sounds above are early signs of wear. Catching them in that window means a scheduled repair instead of an emergency call.
If you or your tenants hear something new, write down which unit it is, what the sound is, and when it happens (at startup, under load, all the time). That detail shortens the diagnosis.
Happy Halloween from all of us at IAH.