Not all heat pumps are noisy. How loud something is, is measured in decibels (dB). According to experts, 30 dB is considered very quiet.Your heat pump has valves that backflow the refrigerant between heating and cooling modes. Many pool owners notice that their heat pump gets louder during the winter. This is because the heat pump’s defrost mode is kicking in and causing the aforementioned valves to shift, causing a whooshing sound, according to Hannabery HVAC
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Are heat pumps louder than air conditioners?
As a residential air conditioning installation, heat pumps do make noise, and if these noises seem louder than usual it could mean one of two things: the compressor is operating at a higher setting, or the whole unit is in “defrost” mode.
Most heat pumps produce sound between 50 and 90 decibels. The higher the decibel rating of the heat pump, the more noise it will make during normal operation. The quietest heat pumps on the market run as low as 50 decibels, which is equivalent to the sound of a conversation at home or light traffic.