Esschert Design Bat houseItem Number: NKVM Dimensions: 15. 80 x 6. 50 x 7. 50 inches A single bat can eat up to 1,000 mosquitoes in one hour! Bats like to nest in warm, tight places, and you can keep them nearby by providing a nice bat house such as this. Bat houses should be placed where they receive six hours of morning sun, and are 10 15 feet off the ground. The best time to install a bat house is either late winter or early spring, but they can be installed at any time.