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We're getting a cat next week and we'd like to place the litter box in the cold room. There is just one catch: there is a super-loud dehumidifier running in that room and it would drive us crazy to hear that noise 24/7.

The noise is inaudible when the door to the cold room is closed, but when it is opened a crack the noise level is bad.

One option we're looking at is to install a cat door instead of leaving the human door open. I am afraid the cat door will reduce the noise insulation properties of the human door.

Another option I was thinking of is installing a spring that would slide the door closed, but I don't want the cat to get locked in the room.

Is there a way to soundproof a cat door so we can all be happy? Is there an better solution than installing a cat door?

Update: I found another option: https://www.youtube.com/watch?v=201ITM4ANno. I could leave the door open and cover the crack with acoustic blankets. Based on this video, the noise level should increase by 5 dB instead of 10 dB without the blankets. The cat should be able to step around the "curtain". Downside: this will look ugly.

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    a tunnel lined with sound absorbing material may be the way to go, for that to work you'll probably need to put the cat door in a wall. – Jasen Sep 5 '20 at 6:13
  • Wouldn't the cat have more fun going through a tunnel and back up through the floor? – DMoore Sep 5 '20 at 6:31
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    The cat may also object to the noise and refuse to use the box in that location as a result. – Ecnerwal Sep 5 '20 at 13:08
  • @Ecnerwal that's exactly what I was thinking ... I'd strongly suggest to the OP that they try out having the litter box in this room for at least a few days before attempting any soundproofing to ensure that' it's acceptable to the kitty. – brhans Sep 5 '20 at 15:21
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    @Jasen The adjoining wall is the foundation of the house (very thick concrete) so we won't be drilling through that :) On the plus side, I've discovered that if I level the dehumidifier the noise level goes down substantially (no more rattling sound). I might be able to leave the door open without losing my mind. Time will tell. – Gili Sep 6 '20 at 17:45

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