Fees
Estimated city fees
Baseline for a simple permitted hvac: $75–$200 estimated mechanical permit fee (varies by project valuation, with electrical sub-permit additional if circuit or panel work is included)
| Fee | Amount | Notes |
|---|---|---|
| Mechanical permit (HVAC replacement) | $75–$200 | Phoenix calculates mechanical permit fees on project valuation. A typical 4-ton residential HVAC replacement valued at $6,000–$10,000 typically yields $75–$175 in city fees under the current Planning and Development Department fee schedule. Confirm current amounts at phoenix.gov/pdd/permits before filing. |
| Electrical sub-permit | $50–$175 | Required when the scope includes a new disconnect, circuit upgrade, or service-panel modification. Fee varies by scope. Filed separately from the mechanical permit. |
| Inspections | Included | Rough-in inspection (before refrigerant charge and electrical enclosure) and final inspection are included under the mechanical permit. Duct-leakage test results must be submitted before rough-in approval when new ductwork is involved. |
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Conditions
The rules that apply
- A mechanical permit is required for any HVAC system replacement in Phoenix, including central air conditioners, heat pumps, gas furnaces, packaged units, and mini-split systems.
- There is no exemption for like-for-like replacement. Swapping an aging unit for identical equipment still requires a City of Phoenix mechanical permit.
- Replacing only the outdoor condensing unit or only the indoor air handler still requires a mechanical permit when refrigerant connections or electrical circuits are involved.
- A separate electrical permit is required if the replacement involves a new or relocated disconnect switch, a new or upgraded circuit, or any change to the electrical service size to the HVAC equipment. Upsizing system capacity commonly triggers a panel-amperage verification.
- Manual J load calculations are required per the 2018 IECC (Section 401.2) for new system installations. Phoenix is in IECC Climate Zone 2B (hot/dry), with extreme summer cooling loads regularly exceeding 115°F design day temperatures. Oversizing a system for Phoenix's climate causes short-cycling and humidity problems in the shoulder season.
- Duct-leakage testing is required for new duct systems or duct additions per 2018 IECC Section 403.3.2 (≤4 CFM25 per 100 sq ft of conditioned floor area). Equipment replacement on an existing, unmodified duct system does not require a new duct test unless ducts are extended or meaningfully repaired during the same scope.
Documents
What you'll need to file
- Completed residential mechanical permit application submitted through the City of Phoenix Planning and Development Department (PDD) permit portal.
- Scope of work description specifying the existing equipment (make, model, tonnage/BTU, fuel type) and the proposed replacement equipment.
- Equipment specification sheets for the new unit demonstrating compliance with the 2018 IECC minimum efficiency requirements (SEER2 for cooling, AFUE for gas heat) applicable to Climate Zone 2B.
- Manual J load calculation report when upsizing or downsizing the system, or when requested by plan review for any new installation.
- Duct-leakage test results if ductwork is new, added, or materially repaired (must be submitted before rough-in inspection passes).
- Electrical permit application and licensed electrical contractor information if disconnect, circuit, or panel work is included.
- Mechanical contractor license number and contractor registration with the City of Phoenix.
Process
How the permit process works
Each step must finish before the next one starts.
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Confirm system sizing for Phoenix's extreme cooling load Phoenix's 2B climate requires accurate Manual J load calculations. The city's design cooling day regularly exceeds 115°F, so over- or under-sizing is a significant comfort and equipment-life issue. Have your contractor confirm or update the load calculation before selecting replacement equipment. SEER2 minimums for Climate Zone 2B apply under the 2018 IECC.
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Apply through Phoenix PDD permit portal Submit a residential mechanical permit application through the City of Phoenix Planning and Development Department portal at phoenix.gov/pdd/permits. Provide equipment specifications and scope of work. If circuit or panel work is included, file the electrical sub-permit application at the same time. Plan review for standard HVAC replacement is typically 1–3 business days.
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Pay permit fee and post permit on site After plan review approval, pay the permit fee. Keep the permit accessible at the job site. Work may not begin before the permit is issued.
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Schedule rough-in inspection After the new equipment is set, refrigerant lines are connected (but before the system is charged), and electrical connections are made (but before they are enclosed), call for a rough-in inspection. If new ductwork or duct repairs are part of the scope, the duct-leakage test must pass before the rough-in inspection can be approved.
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Complete installation and request final inspection After the system is fully installed, refrigerant-charged, and operationally tested, request a final inspection. The inspector verifies installation per 2018 IMC and IECC requirements, confirms refrigerant line insulation, verifies disconnect labeling and clearances, and checks thermostat wiring and condensate drainage.
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Provenance
Code basis & official sources
Last verified 2026-05-06.
2018 International Mechanical Code (IMC) and 2018 International Energy Conservation Code (IECC) as adopted by the City of Phoenix and the State of Arizona, with Arizona state amendments. Climate Zone 2B minimum equipment efficiency standards apply (SEER2 ≥15.2 for split A/C systems, AFUE ≥80 for gas furnaces in AZ). Phoenix City Code Chapter 9, Article III (Mechanical Code).
If you skip the permit
- Phoenix Building Safety can issue a stop-work order and require removal and re-inspection of equipment installed without a permit.
- Unpermitted HVAC work can void homeowner's insurance coverage for fire, water damage, or equipment-related property losses.
- An unpermitted system must be disclosed at time of sale and may require a retroactive permit and inspection, which can require exposing connections.
- An improperly sized or installed system operating without inspection in Phoenix's 115°F+ summers poses serious equipment-failure and indoor-air-quality risks.
- Unpermitted electrical work on the HVAC circuit is a separate code violation with its own fines and corrective requirements.
FAQ
Common Phoenix hvac permit questions
Do I need a permit to replace my AC unit in Phoenix, AZ?
Yes, always. Phoenix requires a mechanical permit for any HVAC equipment replacement, whether it's a like-for-like swap or a capacity or equipment-type change. There is no exemption for residential HVAC replacement in the City of Phoenix.
Does HVAC replacement in Phoenix require an electrical permit too?
It depends on the scope. If the replacement involves no changes to the electrical disconnect, circuit, or service panel, the mechanical permit covers the installation. If the job includes a new or relocated disconnect, a circuit upgrade, or a panel modification (common when upsizing from an older system), a separate electrical permit pulled by a licensed electrician is required.
What SEER rating is required for AC replacement in Phoenix?
U.S. DOE regional efficiency standards effective January 1, 2023, require a minimum SEER2 of 15.2 for split-system air conditioners in the Southwest region, which includes Arizona. This applies to new central AC units and the outdoor condensing unit in a split-system replacement. Your contractor should provide equipment specifications confirming compliance.
Is a Manual J load calculation required for HVAC replacement in Phoenix?
Yes, for new equipment installations under the 2018 IECC. Phoenix's extreme summer design temperatures and low humidity make accurate sizing matter. An oversized system will short-cycle in spring and fall, fail to dehumidify during the monsoon season, and wear out compressors prematurely. Your contractor should have an existing load calculation on file or prepare a new one if the system capacity is changing.
Does Phoenix require a duct-leakage test for HVAC replacement?
Only if new ductwork is being added or existing ducts are materially modified during the replacement scope. Swapping equipment on an existing, unmodified duct system does not trigger a new leakage test. For new duct sections, Phoenix enforces the 2018 IECC requirement of ≤4 CFM25 per 100 sq ft of conditioned floor area, verified before rough-in inspection passes.
How much does an HVAC permit cost in Phoenix?
Most residential HVAC replacement permits cost $75–$200 in Phoenix city fees, calculated on project valuation. A typical 4-ton system replacement runs $6,000–$10,000, putting the permit fee in the $75–$175 range. Add $50–$175 for an electrical sub-permit if circuit or panel work is included. Inspections are included in the mechanical permit fee.
Are heat pumps common in Phoenix, and do they require the same permit?
Heat pumps are increasingly common in Phoenix. The mild winters mean they operate efficiently year-round as cooling-dominant systems, and Arizona utility rebates (SRP, APS) have made them cost-competitive. A heat pump replacement follows the exact same mechanical permit pathway as a central air conditioner replacement. The same rough-in and final inspections apply.
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Disclaimer: Informational only, not legal advice. Rules change. verify with Phoenix permitting staff before you build.