Sort of related to some of the above items...
One other option is an additional roof to form an air space between the new roof and the existing one.
The top roof exposed to the sun heats up and the air flows between that roof and the one below keeping it cooler than it would otherwise be.
This is sometimes called a "fly roof" , tropical roof , false roof etc and was an option fitted to Land Rover vehicles heading to the hot areas. The colour was normally white powder coated aluminium in that case.
Pete.
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