If I build it, will they come?

(I hope this isn't a duplicate. My initial post froze or something) Anyway, I've got mosquitoes galore in my tree-filled yard. They are eating very well off me, my kids and dogs! I've been doing some reading on mosquito control and am seriously looking at a bat house. My question is ... if I haven't really seen many bats around, if I build a bat house, how do I attract the bats to it?
Has anyone done this before and had success?
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