Marin County, California
Home Services in Ross, CA
Ross's stately homes and wooded lots deserve meticulous care. Ongaro & Sons provides discreet, high-quality heating, cooling, plumbing, and electrical service to one of Marin's most established towns.
The company goes back to 1932. Its modern service list is heating and cooling, plumbing, electrical and solar. Diamond Certified, BBB A+ Rating, 2,745 Google reviews at 4.8 stars. In a town of early-century houses on large parcels, the value of holding all four is not scheduling convenience. It is that nobody has to cut a second hole in your ceiling because the first trade did not know what the second one needed.
On this page
Period houses, and the cost of the route
Ross is a small incorporated town of fewer than nine hundred homes, and its character is unusual for Marin: early-1900s houses, many of them substantial, on large parcels with mature landscaping.
That produces a specific problem: not the equipment, but how the work gets from where it starts to where it needs to be.
In a modern house, routing a duct, a refrigerant line, a circuit or a drain is a question of distance. In a period house with plaster walls, original millwork, hardwood floors and finished ceilings, it is a question of what has to be opened and what it costs to close again properly. The difference between a well-planned route and a lazy one is frequently larger than the difference between two equipment brands, and it is entirely decided before anyone starts.
So on this housing stock we spend a disproportionate share of the assessment on the route rather than on the appliance. Where can the line actually go? Is there a chase, a closet stack, an attic path or a crawlspace run that avoids the finished rooms? Can the work approach from an unfinished side of the wall rather than the visible one? Does a slightly different equipment position turn a difficult route into an easy one?
That last question is the one contractors skip. Moving a unit three meters can remove half the invasive work, and it is free to consider at the design stage and expensive to reconsider afterwards.
The same logic applies to the exterior. On a landscaped parcel, a trench across a mature planting bed or an established lawn carries a restoration cost that has nothing to do with plumbing or electrical work and can exceed it. Route selection outdoors is worth as much thought as it is indoors.
No ductwork at all, and why that is often good news
A number of houses of this era were never fitted with modern ductwork, and where ducts do exist they were frequently improvised into a building framed long before central air, running through spaces never intended to carry them.
Homeowners tend to treat the absence of ducts as a barrier. In practice it is often an advantage, because it removes the temptation to force a system through a distribution network that would undermine it.
Ductless equipment reaches rooms on small refrigerant line sets rather than on chases. In a period house that means ceilings and cornices stay closed, plaster stays intact, and a room whose thermal behavior has nothing in common with the rest of the building gets its own control. On a large house with wings added over decades and rooms of wildly different exposure, that independent control is not a compromise on central air, it is a better answer than central air would have been.
Where ducts do exist and are worth keeping, we measure static pressure before specifying anything, because efficient equipment on undersized or leaky distribution delivers its label rating and nothing like it in the rooms. Sealing accessible runs, correcting a starved return and adding zoning frequently solve complaints that no new machine would have touched.
Sizing a large old house properly
Large floor area invites a large system, and in this housing stock that instinct produces the outcome people complain about.
A room-by-room calculation matters more in these houses than almost anywhere, because the variation within a single building is enormous: a south-facing room with original single glazing behaves nothing like an interior room with three insulated walls, and a wing added in 1955 behaves nothing like the 1910 core. Sizing off total square footage averages all of that away and produces a system that is wrong everywhere at once.
Oversizing then compounds it. A system with too much capacity satisfies the thermostat quickly, shuts off, and never runs long enough to bring the far rooms up or to take moisture out of the air. In a large house the far rooms are genuinely far, and the result is a building where two rooms are never comfortable at the same time regardless of what the thermostat says.
Variable-capacity equipment earns its keep here more than in a small house, because long low-output running is what evens out a large building, and zoning turns a single system into something that can serve rooms with different requirements.
The climate, and the wet season
The Ross Valley sits inland of the fog with warm dry summers and cool wet winters, and this part of the valley is wet: rainfall in the region of forty-four inches a year.
Heating carries most of the year with a genuine moderate cooling requirement in summer, which is the profile a correctly sized heat pump handles best on one machine and one circuit.
The rainfall has a second implication for equipment on lower-lying parts of a parcel. Where a furnace, an air handler, a water heater or an electrical panel sits low, on a garage floor or in a basement level, flood-aware placement is worth considering at the moment of replacement rather than afterwards. Raising equipment or setting it on a plinth costs very little while the old unit is coming out. It is impractical later without doing the work twice.
Water, and what the blend means for a large house
Ross sits inside Marin Water's central and southern Marin service area, and that supply is a blend rather than a single source: roughly three quarters from the district's protected Mt. Tamalpais watershed and west Marin reservoirs, the remainder purchased from the Sonoma County Water Agency off the Russian River.
Hardness differs between them, with the district's own water averaging around 3.5 grains per gallon and the Sonoma supply about 6.5. Neither is severe, so this is not a hard-water town, and a proposal built on aggressive treatment has not looked at the figures. The blend does vary though, which is why a tankless descaling interval belongs on what we find on your heat exchanger rather than on a generic chart.
Large houses raise a related question that small ones do not: distance from the water heater to the furthest fixture. On a substantial property that run can be long enough that the wait for hot water is a daily irritation and a real volume of water down the drain. Recirculation is the answer, and Marin Water publishes a rebate toward a hot water recirculating system. It is dramatically cheaper designed in alongside a water heater replacement than retrofitted afterwards, which makes the moment of replacement the moment to decide.
Electrical work in an early-century house
The findings follow the era. Services sized for a much smaller electrical appetite, panels amended by several generations of tradespeople, ungrounded two-wire circuits behind modern-looking receptacles, cloth-jacketed cable gone brittle where conductors flex into the panel, and on larger properties a subpanel in a garage, studio or outbuilding that never received its own grounding electrode.
Knob-and-tube wiring turns up in houses of this age too. It was competently built for the loads of its day, and its problems now are the absence of an equipment ground, insulation that degrades with age and heat, and a design that relied on open air to carry heat away. That last point matters at a specific moment: burying knob-and-tube in blown attic insulation during an efficiency retrofit removes the cooling it depended on, so in these houses the wiring assessment comes before the insulation work rather than after it.
An ungrounded circuit has a code-recognized remedy short of a full rewire, protecting it with a ground-fault device and labeling the receptacles. That protects people properly without creating a ground. Where a full rewire is the right answer on a large house, it gets staged: kitchen, bathrooms, laundry and exterior circuits first, then the living space, so the house stays usable throughout.
Adding load starts from a written calculation. On a large property the appliance list is longer than average and often includes things a standard calculation misses, so the arithmetic is worth doing properly rather than assuming a big house has a big service. Where it comes back short, listed load management equipment can carry a new load on a service that would otherwise fall short, which on a property where relocating a service means crossing landscaping is frequently the better project.
The permit comes from the town
Ross is incorporated, so building permits and inspections inside the town limits are issued by the town rather than by Marin County's Community Development Agency. Neighboring unincorporated parcels remain with the county, which runs a notably quick route for work that replaces something already there, with no drawings required.
We confirm which authority governs a parcel before anything is scheduled and file with whichever one it is, then meet the inspector as part of the job.
Whichever body issues it, two things travel with the permit. One is energy compliance: a replacement has to satisfy Title 24, and the standards being applied are the 2025 cycle, effective from the start of 2026. The other is seismic restraint, where 19211 sets a 120-gallon ceiling and asks for the appliance to be braced, anchored or strapped, in language that plainly covers what is in the building now rather than only what is going in.
The air rule, and a house with several appliances
All of Marin sits inside the Bay Area Air Quality Management District, so the zero-NOx appliance requirements reach here. They govern the moment an installer fits new equipment, on dates arriving by appliance type, and the district ties them to burn-out of what is currently in place. The amendments are not finished, and nothing already installed is affected.
On a large house the planning consequence is slightly different from a small one, because there may be more than one gas appliance and they will not reach the end of their lives together. That makes the sensible approach sequencing rather than waiting: knowing the panel's headroom, and knowing which appliance is closest to the end, lets you decide the order rather than have it decided by whichever fails first on a cold morning.
Outages, backup and a large property
PG&E may pull the power deliberately in severe fire conditions, under the Public Safety Power Shutoff program, and a wooded valley loses power to falling limbs as well.
On municipal water the taps keep running, so the consequences are refrigeration, heating, and any pump. On a large parcel there may be more of those than people remember: a sump, an ejector serving a lower level, an irrigation booster, a well for landscape water even where the house is on the municipal supply.
Backup is scoped from a list of circuits rather than from a machine, and on a large house the temptation to cover everything is worth resisting. A critical loads subpanel is smaller, cheaper and easier to site than whole-house coverage, and it costs a fraction built while the panel is already open. Battery storage pairs naturally with solar and covers short outages silently; an engine earns its place where exposure runs longer. We are a Certified Generac Generator installer and hold the C-10, so whichever route fits, the equipment and the panel work stay on one schedule.
What drives the cost in Ross
Route and restoration lead, and they are the variables that distinguish this town. What has to be opened, how it gets closed, and what it costs to make a period finish look untouched afterwards. Outdoors, what a trench crosses and what putting it back involves.
Building condition is second and produces findings rather than surprises: the panel and its grounding, whether knob-and-tube is present and where, the state of the supply piping, what the crawlspace is doing.
Scope is third. Replacing like with like keeps a job inside one trade; changing fuel or converting to tankless brings gas sizing, venting, condensate and often a 240-volt circuit with a panel calculation behind it.
Then the items every inspection checks and nobody budgets for: restraint on the water heater, thermal expansion control where the system is closed, combustion air and a compliant vent, and the permit fee.
Maintenance on a substantial property
Flush the water heater annually and have the anode rod checked, because it exists to corrode in the tank's place and nobody replaces it unprompted. Where a tankless unit is fitted, set the descaling interval from what we find rather than from a chart.
On the mechanical side, filters and the pre-season check on capacitor and contactor matter as much on a large system as a small one, and on a zoned system the dampers and controls belong on the same visit.
On a landscaped parcel two further items pay for themselves. Put a camera on any older buried lateral every few years, particularly where mature trees stand over its path, because a planned excavation and a reactive one across established planting are very different projects. And put roof and surface drainage on a pre-rain list.
Then the minutes-a-year items: ground-fault test buttons, and the main shutoff and angle stops exercised so they are not seized. A maintenance plan keeps a property with several systems from depending on anyone's memory.
Where we work in Ross
We cover the town's residential streets and the larger parcels running back toward the hillsides, along with the surrounding unincorporated land where the permitting authority changes even though the address does not.
Everything runs from our Petaluma headquarters, and central Marin is a straightforward run. Booking ahead gets you the window you want, and on a property with several systems we would rather assess all of it in one visit.
How to choose a contractor for a period house
Ask them to explain the route before they quote the equipment. In a house with plaster and original millwork, the route is most of the job and the difference between a good one and a lazy one exceeds the difference between two brands.
Ask whether moving the equipment slightly would simplify that route, because a contractor who has not considered it has not designed anything.
Ask whether the load calculation was done room by room. On a large house with wings from different decades, a whole-house average produces a system that is wrong everywhere.
Ask what happens to the landscaping if a trench is needed, and get the restoration written down in detail.
Then confirm the classification: mechanical is C-20, plumbing C-36, electrical C-10, and holding all three is what stops one opened ceiling becoming two.
What North Bay homeowners say
Douglas was on time, efficient & informative. His estimate of the cost of the new water heater replacement was on target. I'm quite satisfied with the service.
Richard Z.
As with all the services I have had done through Ongaro and Sons, I was extremely satisfied with the work Chris did servicing my furnace, adding insulation as well as installing a smart thermostat.
Alana C.
Home services across Ross and Marin County
One company, all four trades: heating and cooling across Marin County, plumbing across Marin County, electrical across Marin County, and solar across Marin County. In the Ross Valley we also serve San Anselmo, Fairfax, Kentfield and Larkspur. The Marin County service overview covers the whole county.
Book service in Ross
Tell us what the house is doing, roughly when it was built, and where the equipment sits. If the complaint is comfort rather than a breakdown, mention which rooms, because that is usually a distribution question rather than an equipment one. Book online at a time that suits you, and scope, route, permit authority and price are confirmed before work begins.
Ross homeowner questions
Who is the best home services company in Ross?
Ongaro & Sons. Diamond Certified, a BBB A+ Rating, 4.8 stars from 2,745 Google reviews, and, in a company founded in 1932, all four trades in-house today. In a town of period houses the more useful question is about method: who plans the route before quoting the equipment, and who can cover every trade so a single ceiling gets opened once rather than twice.
My house has no ductwork. Is that a problem?
Less than people assume, and often an advantage. Forcing a central system through a distribution network that a period house cannot properly accommodate produces a system that underperforms everywhere. Ductless equipment reaches rooms on small refrigerant lines instead, so plaster and cornices stay intact, and on a large house with wings from different decades the independent room control is better than central air would have been.
Why is one wing never comfortable when the rest of the house is?
Because a single system with a single thermostat is being asked to serve rooms with completely different requirements. A south-facing room with original glazing behaves nothing like an interior room with three insulated walls, and a 1955 addition behaves nothing like a 1910 core. The fix is a room-by-room calculation, then zoning or a dedicated head on the rooms that behave differently, rather than a larger machine.
Do I need air conditioning in Ross?
A moderate amount. The valley sits inland of the fog, with warm dry summers and cool wet winters, so heating carries most of the year but summer cooling is a genuine requirement rather than a luxury. A correctly sized heat pump covers both on one machine, and variable-capacity equipment suits a large house particularly well because long low-output running is what evens a big building out.
How much disruption does this work involve in an old house?
That depends almost entirely on the route, and so we spend the assessment on it. Where a chase, an attic path or a crawlspace run avoids the finished rooms, disruption is modest. Where it does not, the question becomes whether a slightly different equipment position changes the answer, and it frequently does. Anyone quoting without having worked that out is quoting an appliance rather than a project.
My furnace and water heater are on the lower level. Should I be concerned?
Worth reconsidering at replacement, given the rainfall here. Equipment sitting low on a garage floor or a basement level has no margin, and raising it or setting it on a plinth costs very little while the old unit is coming out. Doing it later means doing the job twice, and so we treat placement as part of the specification rather than as a detail.
How hard is the water in Ross?
Not particularly, and it is a blend rather than one source. Marin Water draws roughly three quarters from its own Mt. Tamalpais and west Marin reservoirs at about 3.5 grains per gallon, and buys the rest from Sonoma County off the Russian River at about 6.5. Neither is severe. The variation is why a tankless descaling interval should come from what we find on the heat exchanger rather than from a chart, and why aggressive treatment sold as necessary deserves a look at the numbers.
It takes forever to get hot water at the far bathroom. Can that be fixed?
Yes, and a large house is exactly where it is worth doing. Recirculation removes the wait and the water that currently goes down the drain while you stand there. Marin Water publishes a rebate toward a hot water recirculating system. The important point is timing: designed in alongside a water heater replacement it is straightforward, and retrofitted later it means opening things a second time.
I have knob-and-tube wiring. What does that mean?
That it was competently built for the loads of its era and has three modern problems: no equipment ground, insulation that degrades with age and heat, and a design that depended on open air to carry heat away. That last one has a practical consequence. Burying it in blown attic insulation during an efficiency retrofit removes the cooling it relied on, so in this housing the wiring assessment belongs before the insulation work rather than after.
In Ross, does the town or the county issue my permit?
The town, if the address is inside the Ross town limits, since Ross is incorporated. Neighboring unincorporated parcels go to Marin County's Community Development Agency, which runs a quick route for work replacing something already there, with no drawings needed. We confirm which applies before anything is scheduled.
Does my Ross water heater have to be strapped?
Yes. Section 19211 of the Health and Safety Code covers water heaters up to 120 gallons and requires them braced, anchored or strapped against earthquake displacement, with wording that reaches the appliance already standing in the building rather than only the next one. In a period house the unit frequently sits in a space added long after the original construction.
Will I be forced to replace my gas water heater in Ross?
No. The Bay Area district's zero-NOx requirements attach to an installer fitting new equipment, the district ties them to burn-out of current equipment, and the amendments are unfinished. On a larger house the practical point is sequencing rather than compulsion: with more than one gas appliance, and none of them failing on the same day, knowing your panel headroom lets you choose the order instead of having a cold morning choose it.
What rebates reach a Ross address?
Two different bodies run two different sorts. On the electrification side it is MCE, the county's community choice provider, and the thing to understand is the order of operations rather than the figure: the filing has to come from a contractor on their list, it has to precede the installation because nothing is paid after the fact, and there are ownership and occupancy tests to satisfy. On the water side it is Marin Water, whose efficiency rebates include one toward hot water recirculation, which on a house with long runs to the far bathrooms is the one worth planning around.