HVAC in Novato

What is my system telling me when it does that?

Symptoms are more specific than most homeowners assume, and the specific version is worth reporting when you call.

On the cooling side, air that leaves the registers warm while the outdoor unit runs points at refrigerant charge, a failed capacitor, or a compressor that is drawing but not pumping. Frost on the copper line at the outdoor unit almost always means the indoor coil is starved for air, and adding refrigerant to that system makes it worse. Those belong in a real AC repair diagnosis, not a parts swap.

On the heating side, a furnace that lights and shuts down ninety seconds later is usually misreading its own flame or tripping a high limit because heat cannot leave the cabinet fast enough. No ignition at all is a different family: igniter, gas valve, pressure switch, blocked flue. A boom at the moment the burners light deserves a same-week look, because that symptom sits next to heat exchanger damage. We treat those as furnace repair calls with a combustion inspection attached.

Heat pumps have their own vocabulary. A unit that runs continuously through a cold snap and leans on its auxiliary electric heat is saying something about charge, defrost control, or sizing. Ice on the outdoor coil that never clears points at the defrost cycle. A shudder when the system flips from heating to cooling points at the reversing valve.

Then there is the symptom that is not the equipment at all: one room that never comes around while the rest of the house is fine. That is a distribution problem, and no new condenser fixes it.

Should I repair this system or replace it?

We check four things on every aging system, in this order.

Age. Residential equipment that has run through fifteen or more Novato summers is past the point where a major component failure is worth funding.

Refrigerant. R-22 has not been produced or imported in the United States since 2020, so any repair that requires it draws on reclaimed or stockpiled stock. On a pre-2010 air conditioner, a leak is often the end of the conversation. R-410A systems are in a different position: that refrigerant is being phased down under the AIM Act and new residential equipment is moving to lower global warming potential blends, but an R-410A system that is running well does not need replacing on account of the phasedown.

Repetition. One failure is a repair. A third call on the same circuit inside two seasons is a system telling you it is done, and we will say so.

And the one people skip: whether the rest of the house can support what you would install. The ducts, the return path, the electrical panel and the space around the equipment all constrain the replacement. Finding that out during the install is the expensive way to find out.

What should replace it: a furnace and air conditioner, a heat pump, or ductless?

There are really three paths in Novato, and the house usually picks.

A ducted heat pump handles heating and cooling from one outdoor unit and is the strongest fit for a house with duct runs worth keeping. It is also the path that every current incentive program is pointed at. We are a Mitsubishi Diamond Contractor Elite and a Trane Comfort Specialist, which is a manufacturer tier, not a dealer badge, and it governs which equipment we can commission and warrant. A full heat pump conversion is the most common project we quote here now.

A dual fuel system pairs a heat pump with a gas furnace and hands the load to whichever is more efficient at the outdoor temperature. It suits homeowners who want cooling and lower operating cost without retiring a furnace that has years left.

Ductless multi-zone is the answer where there are no ducts to save: additions, converted garages, rooms over garages, and older houses where running new trunk lines would mean opening ceilings. Each head is controlled independently, which is useful in a house where one wing bakes and another stays cold.

The path you can afford to take is partly an electrical question. A heat pump, especially one with electric backup heat, adds a substantial load, and the answer starts with a load calculation on the existing service rather than a guess. Older Novato panels frequently have no spare double-pole spaces left, and on some of them the bus itself is the limit. Where that is the case, an electrical panel upgrade becomes part of the mechanical project rather than a separate errand.

Why does the duct system decide the outcome more than the equipment does?

Because a system can only move the air its ducts allow. We measure static pressure before quoting a replacement, and in Novato's mid-century housing the number comes back high more often than not. The usual cause is return air: one undersized return grille trying to feed a blower that wants far more than it can pull. Manufacturers rate their equipment at a design static pressure, and a system fighting a restricted return never reaches its rated capacity no matter what the label says.

Leakage is the second half of it. Duct runs in an unconditioned attic lose conditioned air into a space that gets punishingly hot on a Novato summer afternoon, and disconnected boots and crushed flex are common in houses where cooling was retrofitted decades after the original build. Sealing and correcting the distribution often buys more comfort per dollar than a larger condenser, and it is why we would rather fix the ducts and install correctly sized equipment than sell a bigger unit to overpower a bad system.

Replacements also have to meet California's Title 24 energy requirements, and the 2025 Building Energy Efficiency Standards took effect January 1, 2026. What that means in practice is that the paperwork now follows the physics, so a design that ignores the duct system has a harder time getting through inspection.

What drives the cost of an HVAC project in Novato?

Nobody can price this from a phone call, but the variables are knowable, and they are mostly not the equipment.

The largest swing is the duct system: reusing sound ducts, sealing and repairing them, or replacing the distribution entirely are three very different projects. Electrical capacity is next, since a conversion that requires panel work carries that work with it. Equipment staging matters, because a variable-capacity system costs more up front and less to run than a single-stage unit. Zoning adds dampers and controls. Access is real money: a tight attic with a small hatch takes longer than a garage. Changing fuel adds gas line abandonment and sometimes venting removal. Permit, inspection and haul-away are line items.

We give you the exact number for your house before we start, and we would rather lose a job on price than discover the price halfway through it.

Do I need a permit for this, and who issues it?

Yes, on any replacement or new installation, and no legitimate contractor will tell you otherwise. Inside the city, permits are issued by the City of Novato Building Division, and the city takes applications through its online permit portal. Where a property is in unincorporated Marin County, the permit goes through the Marin County Community Development Agency instead.

Novato is fully inside the Bay Area Air Quality Management District, so the district's building appliance rules apply here. Those rules set zero-NOx requirements on gas appliances, phased in over time, with fan-type residential central furnaces covered under Rule 9-4 on a later schedule than water heaters.

Read that as a live rule, not a ban. Your gas furnace is not illegal and you are not being forced to remove it. What we do is confirm what the district actually requires on the day your project is permitted, because the answer in 2026 is not guaranteed to be the answer in 2028.

What rebates can I get in Novato right now?

Novato's community choice energy provider is MCE, and MCE runs the heat pump rebate that matters most here. Eligibility is narrower than most people expect. MCE describes it as open to "MCE customers who own and have lived in their single-family detached homes for at least 12 months in MCE's service area," and requires the work be done by a licensed contractor from its own list, with the contractor handling the rebate application and program requirements.

One condition deserves attention before you plan anything else. MCE states that "you will not be able to install other home electrification projects (including solar, battery storage, or EV charging) for 12 months after your heat pump unit has been completely installed." That is a strict sequencing rule. If solar, a battery or a home charger is anywhere in your two-year plan, the order you do things in changes what you can claim, and that decision has to be made before the heat pump goes in, not after. Details are on MCE's heat pump rebate page.

The application also has to be filed before installation rather than after, because MCE does not apply rebates retroactively.

Should losing power change what I install?

For hillside Novato, it should at least be discussed. PG&E turns off power during severe weather to reduce the chance its equipment starts a wildfire, through its Public Safety Power Shutoff program, and the parts of town with the most fire exposure are the parts most likely to see one.

This matters more after electrification than before it. A gas furnace still needs power for its blower and controls, but an all-electric house has no thermal fallback whatsoever when the service drops. Standby generation and battery storage both answer that, and both are cheaper planned alongside a mechanical project than retrofitted later, because the panel work overlaps. We are a Certified Generac Generator installer holding a C-10 electrical license, so our electrical team can scope backup power, the panel and the heat pump as one job.

What maintenance keeps this system out of trouble?

Filters first, because restricted airflow causes more avoidable failures than any other single thing. Check them monthly during heavy heating and cooling stretches rather than trusting the interval printed on the box.

Rinse the outdoor coil annually, and more often near the water where salt accelerates everything. Keep plantings and fencing back so the condenser can reject heat. Book cooling ahead of the first heat wave and heating in the fall, when a weak igniter or a marginal capacitor turns up on a calm day rather than a hard one. Clear the condensate drain and confirm its safety switch, because a plugged drain is a ceiling repair waiting to happen.

Systems on a maintenance plan get this on a schedule, which mostly means the failures we find are small ones.

How do I choose an HVAC company in Novato?

Ask five questions and the field narrows quickly.

Ask whether they run a room-by-room load calculation or size from square footage and the old unit's tonnage. Ask whether they measure static pressure before quoting, since anyone who has not measured your ducts is guessing at your capacity. Ask who pulls the permit and whether inspection is in the price. Ask which rebate programs they are enrolled in, because on the MCE program the contractor's status decides whether you qualify at all. Ask what the labor warranty covers and who honors it in five years.

Then check what is independently verifiable: license class, years operating in Marin, and the review record. Ours is public, and we carry a BBB A+ Rating alongside Diamond Certified status.

What North Bay homeowners say

These came from Novato-area customers on our own service calls.

Where else do you work in Novato and Marin County?

Ongaro & Sons covers every trade in this town under one license and one crew list. See HVAC across Marin County for how we work county-wide, or the full Novato service matrix for plumbing, electrical and solar alongside heating and cooling.