Commercial AC Installation and Replacement in San Jose

Commercial AC Replacement in San Jose: The Short Answer

Replacing a rooftop packaged unit, split system or condenser on a San José commercial property takes a City mechanical permit through Standard Plan Review, because commercial air conditioning is not on the City’s online permit list. Since January 1, 2026, the 2025 Energy Code (Title 24, Part 6) decides which replacement units qualify, requires duct sealing and a demand-responsive thermostat in many cases, and calls for acceptance tests by a certified technician. A new system must also meet EPA’s refrigerant limit for its category, while existing R-410A systems can still be repaired.

We replace and install commercial air conditioning for offices, retail, multifamily common areas and schools as part of our commercial HVAC service, under CSLB License #1101278 (C-20 HVAC).

Rules that shape a commercial AC replacement in San José (checked October 2026)

Which San Jose Permits Does a Commercial AC Replacement Need?

The City’s Building Division says that installing or replacing ducts, furnaces and other mechanical equipment requires a mechanical permit. For commercial and industrial properties, it sends applicants to its online permits table: a project marked “Yes” can use SJPermits.org, and one marked “No” needs Standard Plan Review. In that table, air conditioning, heat pumps, and duct or flue alterations are all marked “No” for commercial and industrial properties. Standard Plan Review starts at SJPermits, with plans uploaded through SJePlans, and the permit is issued after the plans are approved and fees are paid.

Rooftop units add two more checks:

• Weight. Equipment mounted on a roof needs no building permit under 100 lbs., a building permit from 101 to 200 lbs., plans from 201 to 400 lbs., and plans and calculations by a licensed engineer or architect over 400 lbs. In all cases it must be positively attached. A like-for-like replacement follows the same chart; if plans were approved for the original unit, the City accepts the original plan set showing the new unit’s listed weight, but a heavier unit may need new plans. Modifying the roof structure to carry a unit always needs plans and a building permit.
• Planning clearance. Whatever its weight, equipment on a roof or exterior wall needs a clearance from the Planning Division unless it sits lower than an existing parapet or roof screen.

What Title 24 Requires When You Replace a Unit

California’s 2025 Energy Code took effect on January 1, 2026, and permit applications from that date use it. For nonresidential buildings, an alteration that adds or replaces space-conditioning equipment triggers these requirements in Section 141.0:

• New or replacement equipment must meet the prescriptive requirements for new systems in Section 140.4 that apply to it, with listed exceptions. The Energy Commission’s compliance manual notes that minor maintenance, such as filter or belt replacement, does not trigger them.
• Small rooftop units. A new or replacement single-zone packaged rooftop unit with direct-expansion cooling under 65,000 Btu/h must meet Table 141.0-E-1 or use the performance path. The requirement does not apply if the change would exceed the existing main service panel or service transformer capacity, shown by a load calculation from a registered professional engineer.
• Thermostat. When an air handler, the outdoor condensing unit of a split system, or a coil is installed or replaced, a thermostat that doesn’t meet the demand-response requirements must be replaced with one that does.
• Duct sealing. The duct system connected to the new equipment must be sealed when it meets the code’s criteria: a constant-volume, single-zone system serving less than 5,000 sq. ft., with more than 25 percent of the duct surface outdoors or in unconditioned space (healthcare facilities excluded). Leakage then must not exceed 15 percent of the air handler’s nominal airflow, confirmed by acceptance testing. Exceptions cover ducts already sealed and verified, and ducts built or sealed with asbestos.
• Acceptance tests. Listed mechanical systems, including constant-volume single-zone units, outdoor air ventilation, economizers and tested duct systems, are tested under Reference Nonresidential Appendix NA7, and a Certificate of Acceptance goes to the building department. Where certification is required, the tests are done by a certified mechanical acceptance test technician.

Table 141.0-E-1 in San José’s climate zone (2025 Energy Code, checked October 2026)

All of San José’s ZIP codes on the Energy Commission’s list, including 951xx and Alviso’s 95002, are in Climate Zone 4. For a new or replacement single-zone packaged rooftop unit under 65,000 Btu/h, the prescriptive options are:

Building types not in the table have no requirement under it, but the general rules above still apply. Multifamily buildings, including their common areas, have their own sections of the Energy Code; we check which apply on each job.

Refrigerant Rules for New Commercial AC Equipment

Under EPA’s Technology Transitions rule, new air conditioning and heat pump systems must use refrigerants under a set global warming potential (GWP). EPA’s table, last updated August 28, 2026, lists:

EPA’s May 2026 final rule removed the January 1, 2026 installation date for residential and light commercial systems built before 2025, so that older inventory can be installed until it runs out. The restrictions apply to new systems. EPA says components used to repair existing systems are not subject to them, so an R-410A unit in good condition can still be serviced and repaired.

Refrigerants EPA lists as acceptable, with use conditions, for new equipment in this category include the A2L (lower-flammability) refrigerants R-32 and R-454B. EPA notes that its rules and industry standards prohibit using refrigerants like these in systems not designed for them, and on replacing a broken R-410A condenser with a lower-GWP one, it says this may be possible depending on the circumstances. Whether a matched replacement works, or the whole system has to change, depends on the equipment, which we check at the survey.

Cranes and Rooftop Access

When a rooftop unit is set by crane and the crane stands in a City street, San José Public Works issues a revocable encroachment permit for crane construction in the public right-of-way, which typically requires a plan, fees and a security deposit. Cal/OSHA’s Title 8 Section 5006.2 requires operators of cranes used in construction to be certified by an accredited certifying entity or licensed by a government entity, with exemptions such as equipment rated at 2,000 pounds or less. The lift, roof access and fall protection are planned per job.

Planning a Replacement Before a Failure

A planned replacement leaves time for the permit, the Energy Code choice and the lift; an emergency one in a heat wave doesn’t. Units that need repeated refrigerant service, compressor or fan motor repairs, or that can’t hold temperature on hot afternoons are the ones to survey first. A maintenance plan with pre-season A/C tune-ups gives you a record of each unit’s condition, so replacements can be budgeted rather than forced. For general signs, see how long air conditioners last.

Sources

Checked October 2026. City of San José: Mechanical Projects · Online Building Permits · Equipment Suspended or Mounted on Roofs, Floors or Walls · Encroachment Permits (Public Works) · SJPermits: Available Online Permits. California Energy Commission: Blueprint, Fall 2025 (2025 Energy Code changes and effective date) · Restructured 2025 Energy Code, Title 24 Part 6 (for information only, PDF) · 2025 Nonresidential Compliance Manual (PDF) · Acceptance Test Technician Certification Provider Program · Building Climate Zones by ZIP Code. U.S. EPA: Technology Transitions HFC Restrictions by Sector · Final rule fact sheet, May 2026 (PDF) · Substitutes in Residential and Light Commercial Air Conditioning and Heat Pumps (SNAP) · Frequent Questions on the Phasedown of HFCs. Cal/OSHA: Title 8, Section 5006.2, crane operator certification in construction.