I've heard similar about the solar shingles. The watts per sqft and $$ aren't very good. Its a better investment to go more standard on the roof and add typical solar panels especially now when panels are hovering close to $1 a watt. There are more efficient roof designs. Lighter colored or white shingles reflect more heat off your home. If you go asphalt I highly recommend a ridge vent if your roof shape and attic allow it. Metal roofs can be very efficient and are very long lasting. My current build uses a Texas cool roof design, recommended by Dablack. Very nice inside for what is now an unconditioned space. This is also a relatively easy retrofit to an existing house.
Cool Roof Design for Hot Texas Climate | Houston Cool Metal Roofs
And I believe AC has aluminum shingles which has some great virtues as well.
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1.47 kw solar, R-40+ attic insulation, 4 layers radiant barrier, solar attic fan, solar mini pool pump
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