Satellite White paint is the #1 best tool.
Then ventilation.  Convection ventilation with some scotchbrite pads for 
filters works fine.  

Cut holes and install something like this:
https://www.digikey.com/product-detail/en/qualtek/09150-F-45/CR287-ND/250528

From: Sterling Jacobson 
Sent: Friday, July 13, 2018 5:51 PM
To: AnimalFarm Microwave Users Group 
Subject: [AFMUG] How to reliably cool a small enclosure in direct sunlight?

I’ve got a few side of the house enclosures exposed to direct sunlight part of 
the day.

 

Inside the electronics are about ready to melt. Like 90C+ CPU temps.

 

These are about 3’ x 3’ x 12 deep or something like that, so not a lot of room.

 

What are you guys using to keep these things decently cool?



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