How many bats can live in a single-chamber and double-chamber house?

The single-chambered BatBnBs can comfortably accommodate between 40-50 bats and the dual-chambered BatBnBs can hold up to 120 bats. The Mammoth BatBnB can comfortably house up to 240 bats.

See here for a full list of BatBnB features that make them excellent bat homes.