Reply #6: Another reason, usually "vouchers" are a promise to take the

[shraby]

cost off the tax bill at tax time, the Senior has to pay the costs upfront out of their social security. Most Seniors don't make enough for the voucher to have any effect on their taxes which is often very little anyway.
We bought a new furnace but had no use for the energy tax credit for this reason. You can't reduce what you don't owe because you don't make enough to pay much in taxes at all.