Is the buzzing all the time or only sometimes? Have not used ours since March, but as I remember, it sounded the same as when running on cooling, except when it when through its defrost cycle, then it made a slightly different set of noises. The HP at my house goes through s similar process and if I'm near it when it does, can be quite noisy.
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Tom
2016 Newmar Bay Star Sport 3004
2021 Jeep Gladiator Sport Willys
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