Why not go back with slate? It’s far superior to any asphalt shingles, and much better in not transmitting heat and cold. The last virtually forever, but Are hellaciously priced! Or how about a concrete tile roof? Almost as good as slate not nearly as high priced! The slate roof that you have on your house now is the top of the line in roofing products, and asphalt roof is the bottom of the food chain, there is nothing below it. It’s kind a like what the hot Rod guys say, “speed costs, how fast do you want to go?”. In other words generally you get what you pay for, long lasting efficient roofing products cost more than one is the don’t.