Has anyone built a bat house?

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Build a Bat House - Garden for Wildlife | National Wildlife Federation

https://www.nwf.org/Garden-For-Wildlife/Cover/Build-a-Bat-House.aspx

You might be surprised: bats don't always live in caves. Some bats spend winter months in caves, but most bats spend summers in trees, under bridges or in old buildings, where they give birth and rear young.

Build a Bat House - Garden for Wildlife | National Wildlife Federation

Hello my bat buds,

I'm considering building a few bat houses to mount on my house. A few of my neighbors have native gardens which draw a ton of insects for them to feed and hopefully the bats will help keep the mosquito population in check. I've heard that building a multi-unit bat house is best course of action to retain heat better and that it also can take a year + for bats to move in as well.

Has anyone built one themselves? Do you have occupants? How long did it take? Got any pics? Any tips?

Cheers friends!

I should mention, I included one resource of thousands available on the subject. Please, if you have a better resource, don't be afraid to post it! Just trying to generate interest in others to build more housing for these wonderful and necessary creatures!