Heating and cooling Fremont homes on one express HVAC permit
Fremont treats a like-for-like heating or cooling swap as express work. Its Residential HVAC record, issued automatically online, covers a furnace, wall heater, air conditioner or mini-duct split replaced in the same location, and ducts and vents as well. What the record does not settle is the Energy Code. In Fremont's climate zone, a straight air conditioner swap skips the refrigerant charge check while a heat pump does not, and both bring duct sealing.
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Rules on this page checked against 16 public sources, October 2026
Express permit
Residential HVAC, for same-location furnace, AC or split swaps
Energy Code zone
Zone 3 for ZIPs 94536, 94538, 94539 and 94555
Quiet hours
10 p.m. to 7 a.m., under the 2021 noise ordinance
Electricity supplier
Ava Community Energy; Fremont is a founding member
The work
What heating and cooling work in Fremont usually turns out to be
01
An air conditioner out, a new one in its place
The express Residential HVAC record covers an A/C system replaced where it stood. In climate zone 3 the Energy Code does not require field verification of an air-cooled air conditioner's refrigerant charge; that check applies to air conditioners only in zones 2 and 8 through 15. Replacing the condensing unit still counts as altering the system, so the connected ducts are tested and sealed, and every thermostat on the system is changed to a setback model.
02
A heat pump for both heating and cooling
Heat pumps get the refrigerant charge check in every climate zone, Fremont's included, and a ducted system is held to a measured airflow of at least 300 cubic feet per minute per ton of cooling unless it qualifies for the code's alternative test. When it is below 55 degrees outside, an installer who weighs in the charge may use a separate verification procedure written for cold days. The old system's refrigerant has to be recovered by a technician holding an EPA 608 Type II or Universal certificate.
03
Replacing a wall heater
Fremont's express HVAC record names wall heaters, and Rule 9-4's 2029 standard names wall furnaces too: any gas furnace manufactured after January 1, 2029, central or not, must emit zero NOx. Going electric has its own limit. The Energy Code bars electric resistance as the primary heat source in a replacement system, unless the heating being replaced was already electric resistance, which points an electric replacement toward a heat pump.
04
New ducts through the attic or crawlspace
Removing and replacing a duct is on the express list as well. Once more than 25 feet of new or replacement duct goes in, the code's duct rules apply: in climate zone 3, new ducts in unconditioned space are insulated to at least R-6, and a complete new duct system connected to the air handler must test at 5 percent leakage or less. A system that is at least three-quarters new duct material counts as a complete replacement.
Fremont grew as subdivisions. The housing chapter of its Housing Element says the General Plan adopted after the city incorporated in 1956 turned large stretches of farm and industrial land into single-family tracts, and in 2020 detached houses still made up 57.8 percent of the housing stock. Another 13.2 percent were attached single-family homes, about a quarter sat in buildings of five or more units, and 0.9 percent were mobile homes. Each type changes an HVAC job. A detached house has its own yard for an outdoor unit, attached and stacked homes share walls and roofs with the neighbors, and a mobile home's furnace falls outside the Air District's furnace rule altogether.
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Free to request, and you agree the scope and price with the person you hire before work starts. In California, a job over $1,000 in labor and materials, or one that needs a building permit, must be done by a contractor licensed by the CSLB in the right class. Ask for the license number and check it at cslb.ca.gov.
Permits and local rules
Fremont, state and Air District rules on an HVAC quote
Express Residential HVAC record
Fremont's express permits are applied for in Citizen Access, the city's online portal, and issued automatically, but only for a limited scope of work. The Residential HVAC record covers installing, or replacing in the same location, a furnace, wall heater, A/C system or mini-duct split system, and removing and replacing a duct or vent. It does not apply to new construction or commercial projects. A heat pump that needs a new panel, subpanel or receptacle adds a Residential Electrical record.
Source: City of Fremont Planning, Building & Permit Services (fremont.gov)
The noise ordinance's night rule
Adopted on April 6, 2021, Fremont's noise ordinance prohibits disturbing, excessive and offensive noise from 10 p.m. to 7 a.m. Among the acts it lists is the sustained operation in those hours of any electric motor, machine or mechanical device, unless it is enclosed in a sound-insulated structure so that it is not plainly audible from any residential property line. The standards it lists for judging a violation include the sound level against the ambient noise, how near it is to sleeping quarters, the time of night, the duration and the tone.
Source: Fremont Police Department (fremontpolice.gov)
Health and Safety Code Section 17926
California requires the owner of every existing dwelling unit that has a fossil-fuel heater or appliance, a fireplace or an attached garage to install a carbon monoxide device listed by the State Fire Marshal, a duty that has applied to single-family homes since July 1, 2011. Devices go where the standards for new construction, or the manufacturer's instructions, place them. A Fremont house that trades its gas furnace for a heat pump still needs one if it keeps a gas range, a fireplace or an attached garage.
Source: California Legislative Information (leginfo.legislature.ca.gov)
Rule 9-4, as amended on March 15, 2023
The Air District's furnace rule applies to anyone who sells, installs or offers a gas furnace for sale in the Bay Area. Its zero-NOx standard covers every gas furnace manufactured after January 1, 2029, wall furnaces and non-residential units included, and it does not apply to furnaces in mobile homes. The rule also requires the Air Pollution Control Officer to bring the Board a report at least two years before that date on available technology, its cost, incentives and infrastructure readiness.
Source: Bay Area Air District (baaqmd.gov)
State license for this work: C-20 Warm-Air Heating, Ventilating and Air-Conditioning, C-4 Boiler, Hot Water Heating and Steam Fitting, C-10 Electrical. Look up a contractor's license on the CSLB website (cslb.ca.gov).
Timing
Crew hours, quiet hours and the 2029 manufacture date
Fremont lets paid contractors work from 7 a.m. to 7 p.m. on weekdays and 9 a.m. to 6 p.m. on Saturdays and holidays, and not at all on Sundays. Owners doing their own work, alone or with unpaid help, get 7 a.m. to 8 p.m. on weekdays and 8 a.m. to 8 p.m. on weekends. Once the system runs, the hours that count are the noise ordinance's 10 p.m. to 7 a.m. Rule 9-4 keys its zero-NOx standard to when a furnace was manufactured, so check the date on any gas unit offered after January 1, 2029.
Before you hire
Put these to the Fremont contractor before you sign
Will the job go in as Fremont's express Residential HVAC record, and does the heat pump also need a Residential Electrical record?
For a heat pump, who carries out the refrigerant charge and airflow checks with the ECC-Rater, and on which visit?
Where will the outdoor unit sit relative to the neighbors' bedroom windows, and how loud is it running at night?
If ducts are being replaced, will new runs in the attic or crawlspace get at least R-6 insulation?
Is your C-20 license current on cslb.ca.gov, and is a C-10 electrician part of the price for any new circuit?
Questions
Fremont heating and cooling questions
Does Fremont require new homes or replacement systems to be all-electric?
Not under its reach codes. Fremont's green building page lists them as EV readiness, lower wattage limits for commercial outdoor lighting, and mandatory solar on new residential construction, and it says developers are encouraged to design for all-electric systems. Nothing there requires a heat pump when an existing furnace is replaced; which gas furnaces may still be sold is decided by the Air District's Rule 9-4.
The furnace in our Fremont mobile home failed. Does the zero-NOx rule apply?
No. Rule 9-4's furnace standards state that they do not apply to furnaces used for mobile homes, and the Air District's Myths vs. Facts sheet confirms that mobile home water heaters and furnaces are exempt from the zero-NOx requirements of both appliance rules. Its FAQ adds that the rules cover natural gas equipment only, so a propane-fired furnace is outside them as well.
Are there heat pump rebates for Fremont homes right now?
Check before counting on one. Ava Community Energy's Incentive Finder sorts rebates, tax credits and discounts by ZIP code, household size and income. TECH Clean California's single-family heat pump HVAC incentives have been fully reserved statewide since January 17, 2025, and the income-qualified HEEHRA rebates for single-family homes since February 24, 2026, with new requests waitlisted and eligible only if the heat pump goes in after a reservation is approved.
We are only replacing the air conditioner. Why does the quote include a duct test?
Because the 2025 Energy Code treats a new outdoor condensing unit as an alteration of the whole system, and the ducts connected to it must then be sealed and verified by an ECC-Rater. Three cases are exempt: ducts already sealed and verified on an earlier job, duct systems under 40 linear feet, and ducts built, insulated or sealed with asbestos.
Checked against these public sources in October 2026. Rules and programs change: confirm permit requirements with the city before work starts, and a contractor's license on the CSLB website.
