HVAC units usually produce subtle humming noises when they are functioning correctly. If you notice unusual sounds coming from your system, you may need to contact an HVAC contractor for repairs. Understanding the potential causes of common noises can help you diagnose an issue and be prepared for what a technician might recommend. To help you care for your unit, here are a few to listen for and what might be their source.

HVAC Noises That May Point to a Problem

1. Pops

Popping usually means the metal in your ducts is expanding and contracting. This might be natural when you turn the system on and off. However, if the sound is too loud, it may be because the area isn’t properly insulated.

2. Loud Bangs

Loud banging may be linked to insufficient airflow. Check that all vents are open, and if they are, inspect your filter for clogs. If these areas are clean, your HVAC’s ignition may be damaged. There could also be a faulty pilot light in the heating portion of your system. An HVAC contractor will locate the source of the banging to reduce the noise caused by the operation.

3. Scraping & Clanking

Usually, scraping or clanking noises mean there is a loose or broken component rattling around inside the unit. Anything from the blower wheel to motor parts may be at fault. The remedy can be as simple as tightening lose knobs, but if that doesn’t solve the issue, you may need to replace a piece.

4. Hissing

When you hear hissing, the air is escaping. This tends to happen in the ducts, where seals experience regular wear. Not only is the noise disruptive, but leaking ducts waste energy, which will cause your utility bills to rise. Prevent issues by having an HVAC contractor replace the seals.

5. Rattles

Rattling or flapping noises also indicate that something is moving around in your system. In this case, the source depends on where you hear the noise. If it’s in the ductwork, debris or loose screws can be stuck in your vents and rattling with the air. If the sounds come from the unit itself, your AC may be damaged and require replacement.

If you need an HVAC contractor to inspect odd noises in your system, call Hands On Heating Inc. Located in Stratford, CT, their professional team has been helping customers throughout Fairfield and Westchester counties since 2006. From furnace and HVAC repairs to boiler cleaning and water heater service, your residential or commercial property is covered. Learn more about what they offer on their website or call (203)-612-1904 to make an appointment.