When your HVAC system is working right, it should mostly fade into the background. But if it starts making weird noises, it might be trying to tell you something — and ignoring it could cost you.
Here are 7 common HVAC noises, what they mean, and when it’s time to call in the pros:
1. Banging or Clanking
🔍 Possible Cause: Loose or broken parts
That loud banging could mean a part inside your blower or compressor is loose, broken, or has come completely detached. Left unchecked, this can lead to serious damage — and costly repairs.
💪 What to do: Turn off the system and call a technician immediately.
2. Buzzing
🔍 Possible Cause: Electrical issue or debris
Buzzing could mean electrical components are malfunctioning, a loose part is vibrating, or debris is caught in the outdoor unit. It’s often a warning sign of something brewing behind the scenes.
💪 What to do: Safe bet? Let a pro take a look before the problem gets worse.
3. Squealing or Screeching
🔍 Possible Cause: Worn-out belts or motor issues
Think of it like your HVAC screaming for help. Squeals usually point to worn belts or motor bearings on the fritz — parts that need replacing before a total breakdown happens.
💪 What to do: Schedule service soon. This is usually an early warning, not a death sentence (yet!).
4. Clicking (Repeated or During Operation)
🔍 Possible Cause: Electrical control problems
A single click at start-up is normal. But constant clicking could be a sign of a failing relay, thermostat issue, or loose wiring.
💪 What to do: If your system won’t turn on, or the clicking is frequent, time to call a tech.
5. Hissing
🔍 Possible Cause: Refrigerant leak or duct leak
Hissing isn’t just annoying — it can mean refrigerant is escaping or that air is leaking from a duct. Both reduce system efficiency and can lead to bigger problems.
💪 What to do: Refrigerant leaks are hazardous. Call ASAP.
6. Rattling
🔍 Possible Cause: Loose parts or debris
A rattling HVAC system is often one that needs a good tightening or clean-up. Sometimes it’s as simple as a loose panel — other times, it’s a precursor to failure.
💪 What to do: A technician can quickly pinpoint the source and stop it from escalating.
7. Whistling
🔍 Possible Cause: Airflow restriction
If your HVAC sounds like it’s trying to whistle a tune, chances are your filter is clogged or there’s an issue with ductwork design or sealing.
💪 What to do: Check your filter first. Still whistling? Let us check your ductwork.
🗣️ Hear Something Weird? We’re Here to Help.
The earlier you catch strange HVAC sounds, the more money (and headaches) you’ll save. If you’ve noticed any of the noises above — or something even stranger — don’t wait. Let the experts at Precision Temperature diagnose the issue before it turns into an expensive repair.
👉 [619-588-5321]
