An opening along the bottom, back of the ChirpyNest cavity provides for a fresh air flow and ventilation into the cavity. The fact that warm air naturally rises allows this air to flow through the cavity, under and around the nest tray, and exit the cavity at the entrance and the two martin shape openings in the door panel . The ChirpyNest cavity maintains aa internal temperature within a degree of the outside air temperature during the nesting season. This cooler cavity results in the young staying in the nest longer until they are ready to take flight on their own. In 2019 and 2020, after eliminating plastic gourds at my site I had ZERO premature fledges, or Jumpers, at my site.
In the studies I have done recording the temperature in Chirpynest houses, and plastic gourds, s/a the Troyer horizontal and supergourds, I have found the internal temperatures in these plastic gourds to be up to 5 degree more than the outside air temperature, even on ventilated plastic gourds. ChirpyNest provides a much cooler cavity environment, improving the conditions in which the young develop.