When a component fails on an otherwise sound system, the job is contained: a part identified, a repair confirmed, the system tested before the visit ends. When the equipment has reached the end of what repair can reasonably accomplish, the job becomes a replacement, and that is a different conversation entirely. We handle both for homes and properties across Portola Valley, and the call that starts either one goes the same way: scope the job on the phone, confirm the price before anything is scheduled, and explain what the visit covers.
Portola Valley is a town of older homes on generous lots, many of them built before central air conditioning was standard in this part of the Bay Area. Systems here often have histories: additions that were never properly tied into the ductwork, equipment that has been repaired more than once, or controls that predate the smart-thermostat era by a decade or two. We work on all of it.
Call (650) 955-4592 to get a quote or schedule a visit.
A full system replacement is the larger job, and it deserves a more deliberate approach than a repair call. The first decision is sizing. Equipment that is too large for the home short cycles, which means it runs in short bursts, never completing a full conditioning cycle, and the result is uneven temperatures and higher wear on the components. Equipment that is too small runs constantly and still does not reach the set temperature on the days it matters most. A load calculation for the actual space is the starting point, not a guess based on what was there before.
From there, the conversation moves to equipment type. A straight replacement of an aging gas furnace and central AC is one path. A heat pump system that handles both heating and cooling in a single unit is another, and it fits this region's mild winters well. Ductless options are worth considering where the existing duct runs are in poor condition or where an addition was never connected. Each path has a different installation scope, and the quote covers what that scope includes before any work is agreed.
The property will be without heating or cooling for part of the installation day. How long depends on what is being replaced and whether the ductwork needs attention at the same time. That is a fair question to ask when the job is scoped, and we will give you a straight answer. The system is tested through both heating and cooling modes before the visit ends, so the result is confirmed rather than assumed.
Equipment selection, thermostat compatibility, and whether the existing duct system is worth keeping are all things to work through before installation day. Upgrading to a smart thermostat or programmable control at the same time as a system replacement is often the most practical moment to do it, since the wiring is already being touched. We walk through the options on the call so nothing is a surprise when the technician arrives.
Before calling for a repair, a few checks are worth doing. A thermostat set to the wrong mode, a tripped circuit breaker, or a supply switch turned off at the unit are all things that look like equipment failures and turn out to be something simpler. A clogged filter is one of the most common causes of weak airflow and a system that seems to be running but not conditioning the air, and it is something a homeowner can address without a service call.
If the system is short cycling, running in brief bursts and shutting off before the space reaches temperature, the cause is usually a refrigerant issue, an airflow restriction, or a control problem. None of those resolve on their own, and a system that short cycles is putting extra wear on the compressor each time it restarts. That is worth addressing before it becomes a larger repair.
If you have checked the controls and the filter and the system is still not performing, that is when a diagnostic visit makes sense. Describe what the system is doing when you call and we can usually narrow the likely cause before anyone comes out.
We are open every day from 9:00 AM to 8:00 PM, including weekends. For properties with no heating or no cooling at all, those calls are treated as urgent and we work to get a visit scheduled as quickly as the calendar allows. The scope and the price are settled on the phone before anything is dispatched, even on a short-notice call.
For rental properties and homes where someone needs to remain comfortable while the work is underway, we talk through the situation when you book. A repair visit is usually contained enough that the disruption is limited to the area around the equipment. A full replacement takes longer, and if the property is occupied, knowing that in advance lets us plan accordingly.
Clear notes on what was found and what was done go with every visit, so the person responsible for the property has a record of the work regardless of whether they were on-site when it happened.
A SEER rating on an air conditioner or an HSPF rating on a heat pump describes performance under controlled test conditions. What a property actually sees depends on how well the equipment is matched to the space, the condition of the ductwork carrying the conditioned air, and how well the system is maintained over time. A high-efficiency unit installed on a leaking duct system will not deliver the savings the rating implies.
Duct sealing is one of the most direct paths to better efficiency in an older home. Air escaping into unconditioned spaces before it reaches the living area means the system runs longer to compensate. Fixing those losses often improves comfort in rooms that have always been too warm or too cold, without touching the equipment itself.
A thermostat upgrade is another practical step. A smart or programmable control that adjusts the setpoint based on occupancy reduces runtime during hours when no one needs the space conditioned. Paired with a well-maintained system, the difference shows up in energy bills rather than just on a spec sheet.
Whole-home humidifier and dehumidifier installation fits here too. Bay Area homes in the hills can see significant humidity variation across seasons, and a system that is fighting moisture is working harder than it needs to. Addressing humidity at the HVAC level, rather than with portable units, keeps the equipment operating in the range it was designed for.
The symptom a system shows before a visit often points toward the cause. Working through the job types we handle most in homes like those in Portola Valley, here is what each one usually involves.
A faint burning smell at the start of the heating season can be dust burning off a heat exchanger that has been sitting idle. If it clears within a few minutes, it is usually harmless. A smell that persists, or one that appears during normal operation, points to an electrical or mechanical issue that needs a diagnostic visit. A musty smell from the vents is almost always mold or mildew somewhere in the duct system or on the evaporator coil. Cleaning the coil and, where appropriate, installing a UV air purifier addresses the source rather than masking it.
Weak airflow at the supply registers usually traces to one of three places: a clogged filter, a duct leak or disconnection between the air handler and the register, or a blower that is not operating at full capacity. The diagnostic covers all three. A duct that has pulled loose in a crawl space or attic is a common finding in older homes, and reattaching and sealing it restores airflow to the room it was supposed to serve.
Homes with multiple floors or distinct wings often have temperature variation that a single thermostat cannot address. A zoning system adds dampers to the duct runs and separate controls for each zone, so the system conditions each area independently rather than averaging across the whole house. The visit covers an assessment of whether the existing ductwork can support zoning, followed by installation and calibration of the controls. This is also where smart thermostat upgrades make the most difference, since each zone can be programmed around how that part of the home is actually used.
Some older homes in this area heat with hot water circulated through radiators or radiant floor systems rather than forced air. A boiler that is not maintaining temperature, circulator pumps that are running but not moving water effectively, or radiators that are not heating evenly all have specific diagnostic paths. We service hydronic space heating systems on the heating side: the boiler, the distribution loop, and the controls that manage it. The domestic hot water side of any combination system belongs to the plumbing trade, and we stay on the heating side of that line.
The price for a repair visit is discussed on the phone before anything is scheduled. What moves a quote is the fault itself, how accessible the equipment is, and whether the diagnostic uncovers something beyond the original scope. If it does, we explain what was found and confirm the updated price before any additional work proceeds.
A replacement quote is scoped differently. Equipment selection, the condition of the existing ductwork, and whether any additional work is needed to bring the installation up to code all factor into the final number. Work is carried out to code on every job, and the scope is settled before the work begins. Ask what the visit covers and you get a straight answer.
We serve Portola Valley and the surrounding communities throughout San Mateo County. That includes Woodside, Ladera, West Menlo Park, Los Altos Hills, and La Honda. Both residential properties and rental homes throughout the area are within our service range. If you are not sure whether your address is covered, call and ask. For a fuller picture of the job, see our services page for heating and cooling work.
Yes. Some older homes in this area heat with hydronic systems rather than forced air, and we service the space heating side of those: the boiler, the distribution loop, the circulator pumps, and the controls. If the system is not maintaining temperature or certain radiators are not heating evenly, that is a diagnostic visit we can scope on the phone. The domestic hot water side of any combination system is a separate trade, and we stay on the heating side of that line.
Call us and describe the access. Most private roads are not an issue. If there is a gate code, a weight restriction, or a surface condition that might affect access, let us know when you book so we can plan accordingly.
Many homes in this town were built before central air conditioning was standard in the region, and not all of them have ductwork that can support a ducted system without significant work. A ductless mini-split installation is a practical alternative, conditioning individual rooms through a small wall penetration without requiring new duct runs. The right path depends on the home's structure and how many areas need to be conditioned, and we work through those options on the call before anything is quoted.
Yes. Clear notes on what was found and what was done accompany every visit. If the invoice and service record need to go to the property owner or management company rather than the tenant, that is arranged when the job is booked.
Whatever brought us out, a repair or a replacement, the visit ends with the system running and the result confirmed. The visit ends with the system tested, not just the part swapped.
Call (650) 955-4592 and let us come and look at it. We are open every day from 9:00 AM to 8:00 PM.
Also close at hand: Woodside, West Menlo Park, Los Altos Hills. The rest are on our full service area.
Whether you are dealing with a system that stopped working this morning or planning a seasonal tune-up before temperatures shift, we cover the full range of residential and commercial heating-and-cooling work across Portola Valley and San Mateo County. The table below lays out what each service covers, who it fits best, and a practical note to help you decide where to start. Call us with any question and we will scope the job on the phone before anything is scheduled.
| Service Type | What It Covers | Common Needs | Things to Know |
|---|---|---|---|
| Indoor Air Quality & Air Filtration | Assessment of existing filtration setup, Review of what the air handler can support, Filter upgrade or filtration system installation, Airflow check after installation | Households concerned about allergens, particulates, or wildfire smoke affecting indoor air | Higher-rated filters restrict airflow more than standard ones. We confirm the air handler can handle the added resistance before upgrading. |
| Ductwork Repair & Sealing | Duct inspection and leak detection, Sealing or repair where needed, Airflow assessment after sealing, Identification of rooms with uneven coverage | Homes with uneven room temperatures, a system that runs constantly, or a spike in energy bills without an obvious equipment cause | Fixing leaking ducts often makes a bigger difference to comfort and energy use than adjusting the equipment itself. |
| Full System Installation & ReplacementMost Popular | Load calculation for the space, Equipment selection based on actual building needs, Full installation scope breakdown, System tested before visit closes | Homes or commercial spaces where repair costs have climbed or efficiency has dropped enough to show up in energy bills | A load calculation sizes the new system to the building rather than matching the old unit. Oversized equipment short-cycles and undersized equipment runs constantly. |
Call us at (650) 955-4592 to talk through your system, get a straight answer on pricing, and schedule service that fits your timeline.
(650) 955-4592