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It’s as noisy as an air conditioner. Because it is an air conditioner — just run in reverse. Some AC compressors are noisier than others depending on manufacturer and quality.
Just replaced a couple of 25 yr old ACs with heat pumps and this is the answer.
That said, the two noisy parts are in my basement and outside, so meh, whatever. It's never bothered me. Every now and then I'll be in the basement when it kicks on, and it's mostly just reassuring, like at least that things still working fine.