Many retired people do not make enough money to pay income tax to get
a credit.
When I was working I got a credit for my water solar heater and my
heat pump.
To get any credits , ripoff contractors have to do the installations.
If you do any thing yourself you are out of luck
Every week I get 2 to 3 letters from contracters who can get me a
$1600.00 refund from the power company it I will buy one of their
$5000.00 air conditioners.
I had a regular contractor do my last one for $2000.00 and I still
got a refund.
You used to be able to shop for reasonable prices. Now you have to use
only a Power company authorized contractor.
Many years ago when I replaced my first heat pump I just bought one
and installed it my self.