@sharpnado IRS Form 5695 Residential Energy Credits instructions (2023) page 3 - https://www.irs.gov/pub/irs-pdf/i5695.pdf#page=3
The credit limit for each property is as follows.
• $1,200 for insulation or air sealing material system.
• $250 for one exterior door and $500 for all exterior doors.
• $600 for windows.
• $600 for central air conditioners.
• $600 for natural gas, propane, or oil water heaters.
• $600 for natural gas, propane, or oil furnace or hot water boilers.
• $600 for improvements or replacements of panelboards,
subpanelboards, branch circuits, or feeders.
• $150 for home energy audits.
• $2,000 for heat pumps and heat pump water heaters; biomass
stoves and biomass boilers
