Swinging for Divorce…

I agree with several of the insulating methods already mentioned as being potentially effective. There is a product I've used in the past that you simply mix with paint, and it adds "refractive" properties to the paint (California's way of legislating their version of saying 'insulating'). Here is an Amazon link:

Amazon product ASIN B01AC5KRJ6
You can go to the company web site and the "purchase price" is the same as Amazon, but shipping is MUCH higher if you order direct. They have different sized packages where you can treat upwards of 30+ gallons of paint. You'd be surprised just how effective this stuff really is!