The neighbours have had a hot tub installed. It seems to be running 24/7 with perhaps the odd break. I'm assuming this is to keep the water at a constant temperature. You can't hear it much during the day, but it's running all night and it is annoying. We sometimes sleep out in the back garden and it's definitely too loud to be able to do that now. It's a constant low frequency hum, like when a vehicle is parked and running its engine.
Ds2 is autistic and can't have his bedroom window open overnight as his bedroom is just across from the neighbour's hot tub.
Is this type of noise usual with these things? Would it be reasonable to expect it to be turned off overnight?
Please don't flame me, I'm not a hot tub snob and each to their own, it's just the constant noise that's causing concern.