Shrieking sounds coming from the basement. Rattling noises in the walls. It sounds like something from a scary movie, but if they're coming from your house, they could be signs of trouble with your heating system.
With the weather turning colder and your system coming back on, a little extra noise is not unusual. However, if these sounds are scary enough to send you or your pets running for cover, it may be time to call a pro. Call a qualified HVAC professional if you hear these noises coming from your heating system.
Banging. If you hear a loud banging noise when your system kicks on, it could be the ductwork. Ducts are made of thin metal that expands when heated and contracts when cooled. When metal ducts expand, they can make a banging or booming noise.
Rattling. A rattling noise could mean a loose joint or connection in your ductwork. This sound is not only annoying, but it also likely means that you are losing heat and wasting energy.
Knocking. When you hear a knocking sound coming from your heating system, it's likely an issue with the fan, such as when the blower fan becomes misaligned, and the blades hit another part of the furnace.
Shrieking. If you hear a high-pitched noise coming from your system, it usually means that a part — such as a malfunctioning blower motor or a worn-out belt — needs to be fixed or replaced.
Whistling. If your system makes whistling noises, it is probably due to restricted airflow caused by a clogged filter, something in your ductwork or a closed vent or damper. Try changing your air filter and see if the sound goes away.
Whether your heating system is making strange noises or not, it's important to have it cleaned and inspected annually by a qualified professional.
Heat pumps provide savings, comfort and quiet
If your system is older or in need of major repair, consider upgrading to an air-source heat pump. Heat pumps provide high-efficiency and year-round comfort in a single unit. These super-efficient systems produce no onsite emissions and run quieter than conventional HVAC units, helping make your house safer, healthier and less noisy — no more scary sounds.