Permits and inspections for heat pumps

Whether you need a permit, which permits, and what the inspector checks are set by your city or county building department under the codes it has adopted. A DOE guide for homeowners puts it this way: "Your contractor will check with your local building department to determine what building codes apply and to obtain any needed permits. Depending on the extent of your project, you may need a building permit and plumbing, electrical, or mechanical permits."^{[Source 2]}

ENERGY STAR lists permits among the things a written contractor proposal should specify, alongside model numbers, warranties and the payment schedule.^{[Source 3]}

What usually gets submitted

A DOE and New Buildings Institute checklist, written for code officials and based on the 2021 International Codes, lists what a permit application for a heat pump might include:^{[Source 1]}

• a combination permit application (electrical, mechanical, plumbing)
• a floor plan
• the mechanical design: equipment specifications, mounting, line set location and length, ducts, condensate and controls
• an electrical line diagram
• the load calculation
• the manufacturer's installation manuals

Not every jurisdiction asks for all of this; ask your building department what it requires.

What the inspection checks

The same checklist gives a picture of what inspectors look at. Items include:^{[Source 1]}

Area	Examples from the DOE/NBI checklist
Equipment	Installed per the manufacturer's instructions; listed to UL 1995 or UL 60335-2-40; meets federal minimum efficiency (7.5 HSPF2, 14.3 SEER2 for the equipment it covers)
Sizing	Sized with ACCA Manual S based on Manual J loads
Electrical	Service load calculation, conductor size, overcurrent protection, a disconnect within sight of the outdoor unit
Location	Supports, working space for service, above the snow line where snow is expected, flood-zone elevation where relevant
Controls	Backup heat lockout as required by the energy code
Condensate	Drain slope, secondary drain or overflow protection where needed
Refrigerant lines	Insulation, support and UV protection
Fuel	Gas line capped if a furnace is removed

The checklist states that projects must meet "locally adopted codes," so the actual requirements depend on where you live.^{[Source 1]}

Why the permit matters

• Inspection is an independent check on electrical and mechanical safety items that a homeowner cannot easily verify.
• Incentive programs may need it. Many rebate programs ask for installation documentation. For example, Colorado's state heat pump tax credit is claimed by registered contractors under program rules that include equipment requirements; check each program's terms for whether a permit is required.^{[Source 4]} See Heat pump rebates and incentives.
• Records. A closed permit is part of the house's record when you sell.

Practical points

• Ask the contractor who pulls the permit and include it in the written quote (How to read a heat pump quote).
• Ask to see the final inspection result, or look it up on your building department's permit search if it has one.
• If the job includes a panel or service upgrade, ask whether it needs its own permit. See Heat pump electrical requirements.
• Refrigerant work must be done by an EPA Section 608 certified technician regardless of permit rules. See What a good heat pump installation looks like.