i kinda feel sorry for my bats. they were living all around the eaves of the house before we renovated, several hundred of them. kept the bugs away good. since metal roof, cement siding, and all gaps neatly filled w/ stout trim work, we have no more bats on the house. call me crazy, but i happen to like the critters (as long as they're not IN the house), and will probably put up a bat house in the near future...
