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Re:Ask HN: Any Interesting Niche Hobbies? by 101008 on Wednesday April 08, 2026 @06:55PM (#47697259)
Sorry if this is not the place to do it. I live in a city that has bat at nights, so if you live above 6th floor and you leave your windows open, there are chances some confused bats go into your apartment.

Even worse, they can go into the blind box of your rollover. After two traumatic events where I had bats going into my apartment (and it took me 5 days/nights where I didnt sleep at all to take them out alive), I put something in the opening of the blind box to avoid them getting into it.

However, I don't feel safe. I wake up in the middle of the night with any sound thinking they are trying to get into.

All this introduction is to ask if there is something that detracts bats going near my window. Maybe some kind of ultrasound (that I could play with some kind of speaker), or odor? I don't know, but I'd like to try something that could make me sleep more relaxed.

Re:Ask HN: Any Interesting Niche Hobbies? by echoangle on Wednesday April 08, 2026 @07:43PM (#47697601)
Can’t you do some kind of mesh? For bats, it doesn’t even have to be very fine.
Re:Ask HN: Any Interesting Niche Hobbies? by 101008 on Wednesday April 08, 2026 @10:04PM (#47698535)
I asked about this to people who put meshes but they said the mesh goes into the window (it's mostly for mosquitoes), and the open would be outside the mesh, so it wouldn't cover it. I would be OK but I can't find anyone who would be willing to put the mesh on the outside of the window.
Re:Ask HN: Any Interesting Niche Hobbies? by neves on Wednesday April 08, 2026 @11:09PM (#47698869)
Mosquito sound repellents are useless for insects, but solved my bat problem.

A bat loved to defecate in my son's bathroom. The most internal room of the house. I've put a sound repellent in the bathroom and it stopped happening

Re:Ask HN: Any Interesting Niche Hobbies? by thinking_cactus on Thursday April 09, 2026 @01:03AM (#47699459)
Just probably don't want to put those outside, that would probably count as noise pollution for them.
Re:Ask HN: Any Interesting Niche Hobbies? by globular-toast on Thursday April 09, 2026 @03:35AM (#47700425)
That's funny because bats would eat the mosquitos so by driving away bats you're actually making the mosquito problem worse.
Re:Ask HN: Any Interesting Niche Hobbies? by 101008 on Thursday April 09, 2026 @10:03PM (#47712729)
Interesting. What's the brand that worked for you?
Re:Ask HN: Any Interesting Niche Hobbies? by neves on Friday April 10, 2026 @10:50AM (#47719009)
A cheap one from AliExpress.