Video Link:

https://www.youtube.com/watch?v=Lu6DNkWRxJU

Notes:

1/4in Sintra PVC vs 1/16in FRP Shields

Conclusion:

The Light Tan Seaford Box with PVC Shields was up to 3.3°F cooler than the Light Tan Seaford Box with FRP Shields.

The most important factor to reduce heat is color of nest box. On sunny hot days light colored heat shields can be added to light colored boxes to reduce temperatures another 2°F-3°F.

Recommendation:

Use a light colored paint and/or heat shields to protect your nest boxes and provide adequate top cross ventilation.

Note:

There was a question about ventilation in these boxes. There is a 1/2in high 4in long vent in the front and also a pair of vents in the upper back. See photos below.