Are Heat Pumps Noisy: When You Should Be Worried

“Are heat pumps noisy?” This is a question many homeowners ask themselves when considering a heat pump system for their homes. 

While it’s true that all HVAC appliances do make some noise, modern heat pumps should never be noisy. In fact, if your heat pump is excessively noisy or makes  unusual rattling sounds, it’s probably a sign  it needs service from a licensed HVAC technician. 

Understanding the difference between the normal and abnormal sounds a heat pump makes is essential for system maintenance and prolonging the lifespan of your unit. Keep reading for our ultimate guide to heat pump noises, and know when to ask the professionals for help.

How Noisy Are Heat Pumps?

Heat pumps, like other HVAC appliances, make some noise while they are running. While this sound can be heard clearly, it is not loud enough to be annoying or disturbing.

Heat pump noise levels max out at around 76 decibels, which is as loud as a dishwasher, refrigerator, or a conversation. You may hear common heat pump sounds, such as humming, whizzing, and blowing sounds while the unit is running. 

Heat Pump Noise Level by Type

There are three types of heat pumps used by Canadians—air, water, and ground source. While they all run quietly, their noise levels vary. 

• Air source heat pumps: The loudest because of their external units. These contain a large fan that draws outdoor air and extracts heat during heating and cooling. The fan emits noise, but not loud enough to disturb neighbours. 
• Water source heat pumps: Second loudest in sound rating. They may not have a noisy outdoor unit, but their fans cause loud operations. 
• Ground source models: The quietest heat pump type, because they don’t rely on fans to circulate heat indoors. Instead, they absorb the ground’s heat and transfer it through ducts or radiant floor heating. 

Heat Pump Making Loud Noise in Cold Weather

The heat pump noise level will be higher in winter when it works hardest and longest. At this time, you may hear occasional rattling due to ice build-up on the fan blades, triggering the defrost mode. 

During this cycle, the heat pump system temporarily switches to a “cooling cycle” that draws heated air and uses it to melt the ice. You may hear a whooshing sound lasting a few seconds. Its frequency depends on how fast frost forms on the outdoor unit. 

Related: The Ultimate Heat Pump Buying Guide for Homeowners

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Heat Pump Noise: When Should You Worry?

The moment you ask “Why is my heat pump so loud,” it’s time to check the unit and investigate. Keep an ear out for the following sounds that could indicate a problem. 

Loud Vibrating Sounds

With an efficient heat pump, you’ll be accustomed to the quiet buzzing or humming sounds your unit makes. However, intense vibrations aren’t normal and may indicate your unit has an issue.

Incorrect installation could be the answer as to why your heat pump is making a loud humming noise. If the indoor and outdoor units are unleveled, the shaking resulting from the imbalance can cause a rattling noise.

Screeching and Squealing Heat Pump Noises

If your heating system is making a screeching or squealing sound, it’s time to have it serviced. These abnormal noises may be a sign of a faulty compressor or a worn-down fan motor, both of which will reduce the efficiency of your unit. 

Related: How Heat Pumps Work

Gurgling Unit

Gurgling sounds aren’t normal heat pump noises. If you hear this sound, it may be due to a low refrigerant change or a refrigerant leak, which will make it difficult for your heat pump to absorb and dissipate heat.

Metal on Metal

Sometimes the inside unit is quiet, while the outdoor unit is causing a ruckus. Nobody wants a noisy neighbour, so have a professional take a look at your unit for any obstructions to the fan blades. Metal scraping sounds are often signs of the fan blades hitting ice or loose components within the unit. 

Clicking Noises

Occasional clicking sounds are completely normal as the unit powers on and off. However, if your heat pump is making these sounds continuously, it’s probably an electrical issue. Address these issues promptly as they could eventually lead to system failure.

What to Do With Heat Pump Noise Inside the House

Your heating and cooling system should make your life easier, not disturb you with loud noises. If your heat pump noise level is louder than a gentle humming, it may have an issue that should be seen to by a pro. 

While it may be tempting to save money with DIY diagnostics and repairs, trying to fix the unusual noises yourself could make the problem worse. An HVAC professional will diagnose the strange noises and restore your heat pump noise to normal operation levels.

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Quiet Heat Pumps Need Maintenance

Regular heat pump maintenance keeps all of the unit’s components in check. This step keeps your heat pump unit running efficiently, preventing problems that cause noise down the line. A professional HVAC technician can inspect for issues, report current conditions, and provide actionable solutions.  

Ontario’s Top Heat Pump Services

Are heat pumps noisy? The answer should be no.

If your peaceful home environment is disturbed by noise issues, it could be a serious problem. Avoid the guesswork, and let Ontario’s leading HVAC specialists take care of it.

Whether you need repairs to your current unit or installation of a new heat pump, our licensed professionals are available with same-day service to get warm air flowing in your home. We  offer 24/7 support, and promotions and rebates to make fixing a noisy heat pump easier than ever. Contact us today for a quote!