I voted for the bats. There are quite a few bats living in my neighbors attic. He doesn't know it but in the summer, right as the sun is setting and the mosquitos are coming out, several dozen bats come out of the neighbor's attic. I like watching them come out and begin to dart all around the local back yards. If you toss a pebble up in the air they will swoop on it to see if it's a bug. They are peaceful and quiet.
I have seen many purple martin houses filled with sparrows and other such birds. I think you'll have better luck with the bats.
__________________ Honor Student: School of Hard Knocks To the world you may be one person, but to one person you may be the world. Quando Omni Flunkus Moritatus
The Mexican Free-tail bats in the Austin are are quite famous. Mosquitos are active both day and night. Martins and bats will cover both bases.
A bat house is a great idea. I have a "bat bridge" about a mile from my house, but am planning on building a bat house soon. Our bat bridge has about 50,000 bats, but they need more room. I am going to invite them to live at my house. At least 50-100 or so.
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"Robo is right" Fuzzball
The Mosquitos that live high in the Rocky Mountains and Alaska are very bad. During Spring run off or in slews in some areas losing your face mask can be dangerous. I live in a mountain valley, the village has to be sprayed by air craft every week during the season.