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@EDESP wrote:

Client purchased ... heat pump

AND single stage multi speed ECM 80% gas furnace. 

I completed form for $600 tax credit

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Have you verified the Heat Pump qualifies for the credit?

An 80% gas furnace does NOT qualify for the credit.  For 2023, gas furnaces need to be at least 97% efficient to qualify for the credit.

$600?  Is this a 2023 tax return?  You may be entering the Heat Pump in the wrong spot.  The credit for an electric heat pump is 30%, up to $2000 (not $600).