|
I'm currently running an experiment with three identical 40' shipping containers sitting next to each other. I painted one with "mobile home" white coating. Stuff from Home Depot, total material cost about $100. The second unit I painted with the fancy NASA-spin off "ceramic" white paint. Material cost on this was around $800! The third unit was left uncoated as a control.
The white roofs were 36 degrees F cooler than the uncoated unit. This was measured on the exterior with a laser thermometer. The interior temperatures were 16 degrees cooler for the "mobile home" white and 18 degrees cooler for the NASA-spin off white.
Important to note: I did not coat the exterior walls. I think that would make a big difference... similar to the heat gain through the windows in a car. That said, back in the '70s I put chrome film on the windows. Much cooler. I later went to a very dark window tint and it seemed cooler.
By the way, I live in Louisiana and have been driving white trucks for 20 years.
|