We have them on our house. In Australia it's very much worth getting awnings and ceiling fans as well as having a heat pump.
In summer afternoons they can make a really remarkable difference.
Lots of countries even where electricity is cheap use awnings as it's just better to not need to cool something down if it can be avoided.
My childhood home in WA (Western Australia) had awnings, along with shade trees and a patio and it made a huge difference. noticed especially where the west facing Window got setting sun in summer and had no awnings