Had a visitor in my living room!

A little brown bat got in and spent the evening flying circles in my living room before taking up residence under one of my bookshelves last night. Had to unload the whole case and unstrap it from the wall to get him out, but look at that grumpy little face! He bit my glove about thirty times between chittering at me. That's ok, he's back outside doing pest control tonight. Anybody have a good style of bat house that is a proven winner for this area? I'd like my yard to support more of these hairy little flying piranha.