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Something like the reflective white roof paint?
There is also a reflective insulating paint that is Nano-something paint that reflects radiant heat and insulates at the same time.
I use reflectex insulation, it's basically bubble wrap made out of silver plastic like the space blankets are made out of, only the bubble wrap part creates air gaps that slow heat transfer as well, it comes in 50 foot rolls that are 12" wide, 16" 24" or 4 feet wide with tabs for stapling, they also make hot water heater blankets and pipe insulation rolls.
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