Yes. You may be able to claim the energy-efficient home credit for a new Rheem HVAC system if the HVAC unit qualifies. The documentation you describe here may not be enough on its own. The IRS requires proof that the specific system installed meets applicable energy-efficiency standards.
The invoice should show proof of purchase and that the system was placed in service (date and seller/installer).
To be sure you are clear to claim this, be sure to note the model numbers of the installed equipment. You can also take a photo of this. Usually, the manufacturer will have a certification statement confirming the model qualifies under IRC §25C. You should retain the model numbers and manufacturer certification with your tax records. It doesn't need to be filed with the return.
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