Is your house trying to tell you something? From mysterious knocks to unsettling creaks, the noises in your home could be more than just background sounds—they might be early warnings of bigger issues. Listen closely, because ignoring these whispers from your walls could cost you more than a good night’s sleep.

Heating and Cooling Systems

Unusual sounds from your HVAC (heating, ventilation and air conditioning) system might mean that it’s struggling. Get these issues checked before you lose heat during the frigid winter months or cooling relief during the hottest time of year.

Squeaking or Squealing: Bearings in the motor may need oiling or a piece could be broken. You also could have a worn-out or misaligned fan belt. Ignoring this sound can lead to motor failure, so address this soon.
Whistling: This could be the sign of air leaks in the ductwork or a dirty air filter. Try replacing the filter first and see if the sound disappears. Filters should be replaced every three months.
Grinding: Moving parts aren’t operating smoothly or it could be worn-out bearings in the motor. Get that checked out.
Popping: This can indicate moisture or a clog in the gas line. It also could be expansion or contraction of the ductwork, especially when turning on the heat.
Clanking or Banging: This happens in air handlers or furnaces due to rusted or chipped metal, or soot buildup.
Clicking: A malfunctioning electrical relay could create a clicking sound.
Boiler Knocking: The circulation pump may be failing.
Hissing: This could signal a leak in the refrigerant line, or there could be an internal valve leak. The compressor pressure also could be too high.
Gurgling: You could be low on refrigerant or have a coolant leak.
Booming: There could be airflow issues where the ducts connect.
Buzzing: This sound could be caused by loose wiring, a failing motor, or capacitors that are malfunctioning.
Rattling: There may be loose parts within your unit, such as screws or fan blades.

Appliances

Unusual noises from appliances with motors might mean a mechanical problem. Homeowner warranties usually cover this type of issue.

Humming Dryer: Your clothes dryer could have an object caught in its blower.
Buzzing Refrigerator: The refrigerator could have an ailing compressor.
Grinding Dishwasher: If your dishwasher sputters or grinds, something could be stuck in its chopper blade.
Popping or Rumbling Water Heater: Water heaters operate almost silently, so if you hear sounds, don’t ignore them. Popping or rumbling could be due to sediment buildup on the bottom. It means it’s struggling to operate and might fail. You may need to flush the inside of the tank.
Noises from Gas Appliances: Don’t wait on gas appliances that are making noises. This may indicate a leak that could be serious.

Plumbing and Pipes

You want your plumbing and pipes to work properly. Water can cause significant damage if problems aren’t addressed in a timely manner.

Clanking: This sound could be a steam radiator that is not draining properly. It also could indicate a loose pipe. Get that fixed, as loose pipes moving around could lead to burst pipes.

Banging or Thumping: This is caused by water changing direction or being brought to a sudden halt. Usually, it doesn’t cause problems, but the sound can be annoying. You can buy a water hammer arrestor for appliances that reduce the noise.
Gurgling Toilet: This could indicate a plumbing backup somewhere. It could be a partially clogged drain, a problem with the flush value, a buildup of sediment in the tank, or inadequate venting in the plumbing system. You will want to call a plumber sooner than later.
Dripping: Water leaks inside a wall can lead to mold or mildew and can destroy insulation. Try to isolate where the dripping sound is coming from. Get professional help as needed.
- Water Loss Test (water meter): If you cannot find the leak, try a water loss test. Look at the water meter and write down the reading. Stop all use of water in your home for 30 minutes. Do not flush the toilet or use the sink, tub, shower, dishwasher or washing machine. Turn off the ice maker and sprinkler. Then check the water meter at the end of the half hour. If the reading is unchanged, you do not have a leaky pipe. You could have a leaky toilet or appliance.
- Water Loss Test (well water): If you have well water, you won’t have a water meter to check. Stop all water use and stand near your water pump for 30 minutes. Listen for clicking sounds from the pump which could indicate a water leak.

Lights and Outlets

The lights and outlets in your home are connected to the electrical system. When components of this system fail, it not only is frustrating but could be dangerous.

Humming, Buzzing, Hissing, Crackling or Popping (light switches and outlets): Buzzing is the sound of electricity arcing across a bad connection. If you hear buzzing from your light switch or outlet, or a hissing/crackling/popping sound, stop using it immediately and call an electrician.
Humming, Buzzing, Whining (bulbs or dimmers): If a fluorescent bulb is making the noise, it means a ballast likely needs to be replaced. That is the part that controls the voltage to the bulb. If the dimmer is making the noise, replace it. You can also try changing the bulb as some bulbs work better with dimmers.

Walls, Ceilings & Windows

Unexpected sounds from above or behind the walls might mean unwanted guests. Noises from your windows could signal hidden openings. Both could translate to expensive repairs if not addressed.

Skittering: This is the sound of critters in your home: raccoons, squirrels, birds, and even insects. The longer they are there, the more damage they can do, from chewing through wiring and insulation to giving birth to babies. When these animals die in your walls, they also cause an awful lingering odor. Take note of when you hear the sounds. Rodents are nocturnal. Call an exterminator. Be sure to search and seal the openings that allowed critters into your house or more could follow.
Buzzing: If you hear a buzzing sound in your walls, it could indicate a colony of bees making their nest there. Carpenter bees are especially known to do lots of damage by burrowing in your wood. Contact a professional pest removal service to safely get rid of this hazard.
Creaking and Squeaking (floors): These sounds could be the house settling, or they could be caused by temperature changes that result in the wood boards rubbing against each other. However, when the squeaking is accompanied by sagging or gaps in the floor, you will want to consult a professional.
Whistling (windows): Whistling sounds could point to improper installation, worn weather stripping, or poor seals. Check the seal around your windows for signs of wear, and caulk or reseal as needed.
Rattling (windows): Something is not fitting quite right if you hear rattling. Get it checked out as this could lead to cracks in the glass.

Your home is your greatest investment. Keep up with winter home maintenance and protect your home with the right insurance for added peace of mind.

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