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We're too dry here for a bat population -- our substitute is the barn swallow and I can't see any effect on their numbers.
I run two "standard issue" bug zappers w/ the u-tube flurorescents made for the purpose -- one 40W, the other 80. I leave them on 24/7 from "first bug that bugs" 'til first frost. There is no shortage of critters for them to attract although they do make a discernible difference around the house...
Mosquitos are killed only by happenstance by them, of course. For the most part, however, can keep them under control fairly well -- again, being dry helps except for where the yard/garden/etc are irrigated and some problems around the lots where cattle waterers, etc., are provide some breeding grounds that can't be totally eliminated but can be minimized/controlled.
Whatever one does, 'tis a never-ending battle... :(