This is the bat house.  It is made of plywood and furring strips.  It was built by stacking the four sheets of plywood, one in front of the other. Each seperated by two pieces of furring strips, one running down on each side. This creates three chambers for them to crawl into and make home.  

The dimension are 36" X 48", including the 12" landing strip located on the bottom.  The plywood was scuffed up with a saw and drill to provide places for the bats to hold on to and noseeums netting was stapled to the landing pad at the bottom. Bats like a variety of microclimates so the bigger the bathouse the more places for the bat to move around in.  Of course not all bats live in big spaces.  This house was placed in front of the flowering yucca and marshmallow plants, which hopefully will attract pollinators which will attract the bats.

In my region bats generally find homes in the spring when they are migrating to the area and raising their young.  They also find new cooler places in the fall to help them reach a state of reduced body heat and metabolism called torpor.