In fact, the only moving parts are pumps and they can easily be placed indoors. Usually, a typical ground source heat pump makes approximately 40 to 50dB of noise. So, compare this with a quiet library at 30 to 40dB and a dishwasher at 50 to 60dB.
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Answer: All heating products make some noise, but heat pumps are usually quieter than fossil fuel boilers. A ground source heat pump may reach 42 decibels, and an air source heat pump may reach 40 to 60 decibels, but this depends on manufacturer and installation. As a rule, heat pumps are not noisy
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.
Geothermal heat pumps aren’t noisy, and even entry-level ones that produce more sounds are still quieter than those that run on fossil fuel. However, it doesn’t mean that you should expect a quiet operation when switching to geothermal heat pumps
Heat pump, 50dB, Doesn’t cause any discomfort
Washing machine, 70dB, Can be annoying