My neighbors bought a hot tub with them when they moved in four years ago, it was an inflatable that only made any noise when in use. I try to be a live and let live type of person, so I never minded when they had friends round for parties or when they just used it for family fun - it all sounded quite jolly in fact.
BUT, now they have replaced it with a permanently installed variety that is plumbed in. I know nothing about hot tubs, so couldn't say what type it is, but what I do know is it sounds like a very loud humming refrigerator on a very regular basis, even when not being used, including at various times throughout the night. This is making it hard to go to sleep and has sometimes woken me in the early hours. From what I've managed to find out, this is something to do with keeping it clean and happens whether they have used it or not.
Does anyone have one of these and if so could you please explain to me why it has to be switched on all the time? I really don't want to fall out with them over it, and as I said, I don't want to be a killjoy, but I wonder if there is anything I could ask them to do that would mitigate some of the annoyance.
Thanks for any insight you may be able to share