If there is no heat on in your home and the tempurture is 20 degrees can a cluster fly live there?

Cluster flies can survive in cooler temperatures, but they typically seek shelter in warmer environments during the winter months. At 20 degrees Fahrenheit, the conditions would be too cold for cluster flies to thrive, and they would likely become inactive or die due to the extreme cold. Therefore, without heat in the home, it would be unlikely for cluster flies to live there comfortably.