The call we get most often from North Fair Oaks is a system that has stopped doing its job without much warning. An AC that ran fine last summer and now blows room-temperature air, a furnace that cycles on and clicks off before the house warms up, a heat pump that has been coasting on the wrong setting for weeks. Homes in a town this size tend to have equipment that has been in place for a long time, and when something finally goes wrong, the question is usually whether to fix it or replace it. That conversation starts on the phone, before anyone comes out.
We handle the full range of heating and cooling work across North Fair Oaks, from a single repair visit to a complete system replacement. Homeowners dealing with a system that has never been right, property owners managing a rental that needs a working heat source before a tenant moves in, small business operators with a rooftop unit that has been struggling through the season: those are the calls we take, and we scope every one of them the same way. You get a price before anything is scheduled, and the visit is explained before it happens.
Call (650) 955-4592 or reach us at [email protected].
When the system is completely down, no heat or no cooling at all, that call goes to the front of the line. We are open every day from 9:00 AM to 8:00 PM, and short-notice calls are handled the same way as scheduled ones: the problem is scoped on the phone, the price is confirmed before anyone heads out, and the visit covers what was agreed. You are not waiting on a callback before anyone looks at the system.
For rental properties and commercial spaces that cannot simply shut down for a repair, the visit is planned around what is actually happening in the building. A tenant who needs to stay comfortable, a business that has to stay open: those are conditions we work around, not reasons to delay. The scope and the price are settled before the visit, so there are no decisions being made on the fly once the work starts.
Clear answers. Real pricing. Real fast response.
A few things are worth looking at before picking up the phone, because they turn out to be the whole problem often enough to matter.
Start with the thermostat. Confirm it is set to the right mode, that the temperature setting is where it should be, and that the display is responding. A thermostat that has lost its settings, or one that has simply lost power, can stop a system that is otherwise working fine.
Check the filter next. A filter that has not been changed in several months can restrict airflow enough to cause the system to shut down on a high-temperature limit, which reads like a breakdown but clears once the filter is replaced and the system has cooled down. If the filter is visibly clogged, replace it before calling.
Finally, check the supply switch on or near the air handler or furnace. It looks like a light switch and is sometimes turned off accidentally. If it is off, turn it on and give the system a few minutes to respond before assuming something else is wrong.
None of this replaces a diagnostic visit when something is genuinely wrong. But it rules out the easy answers first, which saves time on both sides.
Leaking or poorly run ductwork is one of the most common reasons a system in an older home works harder than it should without keeping the house comfortable. Air that escapes into an unconditioned space, attic, crawlspace, or wall cavity, never reaches the rooms it was meant to condition. The result is uneven temperatures, a system that runs longer than it should, and energy bills that reflect the extra load.
Ductwork repair and sealing addresses this without tearing into walls. The visit covers an inspection of the duct runs to find where air is escaping, followed by sealing the affected sections. In homes where the original duct layout never properly reached an addition or a back bedroom, targeted repairs can make a more noticeable difference than adjusting the equipment itself. We'll confirm the repair with you before it goes ahead.
The price for a heating or cooling visit depends on what the system turns out to need, and that is not always clear until a diagnosis is done. What actually changes a quote is straightforward: what the fault turns out to be, how accessible the equipment is, whether parts need to be sourced, and whether the right answer is a repair or a full replacement.
A repair on a system that is within its useful life and in otherwise reasonable condition is usually the lower-cost path. A system that has needed repeated attention, or one where the cost of the repair approaches what a new unit would run, is a different calculation, and that conversation happens before any work is agreed. You do not need to know what is wrong before you call. Describe what the system is doing and we will scope the visit from there.
The rate is discussed on the phone. The price is confirmed before the visit is scheduled. What the visit covers is laid out before anyone comes out, and work is carried out to code on every job.
A furnace that starts, runs briefly, and then shuts off before the house warms up is often dealing with a flame sensor that has become coated with residue and can no longer confirm a steady flame. The control board reads this as a failed ignition and shuts the burner down as a safety measure. The fix is cleaning or replacing the sensor, and it is one of the more common furnace calls we handle in homes with older heating equipment.
Water collecting around an air handler or furnace is not a plumbing problem. It is almost always a blocked condensate drain or a cracked condensate pan, both of which belong to the HVAC system. Left unaddressed, standing water causes secondary damage to the surrounding area and can trigger the system's float switch, shutting the unit down entirely. The visit covers clearing the drain, inspecting the pan, and confirming the condensate path is clear before the visit ends.
When a room is consistently harder to heat or cool than the rest of the house, the duct run serving it is usually where the investigation starts. A section that has separated at a joint, a run that was never properly sealed at installation, or a flex duct that has kinked over time can all reduce airflow to the point where the room barely responds to the system. Sealing and repairing the affected sections restores the balance without touching the equipment.
When a system has reached the end of its useful life, a replacement quote covers a load calculation for the home, equipment selection based on the actual heating and cooling load, and a clear breakdown of what the installation involves. Getting the sizing right matters more than the brand. An oversized system short cycles, never runs long enough to properly dehumidify the space, and wears out faster than a correctly sized unit. The system is tested through both heating and cooling before the visit closes. The system tested before the visit ends is standard on every replacement job.
A rooftop unit that is underperforming in one zone affects the comfort of the whole building, and a unit working harder than it should will show up in the energy bill before it shows up as a breakdown. Rooftop unit service covers the same diagnostic process as a ground-level system: refrigerant check, coil inspection, airflow assessment, and electrical connections. Commercial quotes follow the same process as residential ones, and clear notes on what was found and what was done go with every visit.
The region's mild winters make heat pump systems a strong fit for properties that are ready to move away from a gas furnace. A single heat pump handles both heating and cooling, which means replacing two pieces of aging equipment with one. For homes in North Fair Oaks that have never had central air conditioning, a ductless mini-split system is often the more practical path, particularly where existing ductwork is absent or undersized. A first-time install quote covers a room-by-room assessment, equipment selection across ducted and ductless options, and a full breakdown of the installation scope. We're one phone call from getting your comfort right.
We serve North Fair Oaks and the surrounding communities throughout San Mateo County. That includes Atherton, Redwood City, West Menlo Park, Menlo Park, and Emerald Lake Hills. Both residential and commercial properties across the area are within our service range. If you are not sure whether your address is covered, call and ask. Most of the practical detail sits on our page of HVAC services.
Yes, and it is one of the first things we ask about. A tripped breaker or a disconnect that was switched off during a previous service visit is a common cause of a system that will not start. If the breaker is tripped and resets but trips again immediately, stop there and call us rather than resetting it a second time.
Yes. A complete service visit covers both the indoor unit and the outdoor unit, because problems in one affect the performance of the other. Checking only one side of the system gives an incomplete picture of what is actually going on.
Yes, and it is often the most straightforward path for homes in this area that were built before central air conditioning was standard. A mini-split system places an outdoor compressor unit outside and routes refrigerant lines through a small wall penetration to one or more indoor air handlers, with no duct runs required. The number of indoor units and their placement are determined by the size and layout of the home, and that is part of the planning conversation before anything is ordered.
Call (650) 955-4592 and describe the home and we will scope the options from there.
A no-heat situation is treated as an emergency, and we handle those calls with the same urgency as a no-cool call in summer. The scope and price are confirmed on the call before the visit is dispatched, and the system is diagnosed as soon as access is available.
It depends on the condition of the ducts and whether they are sized correctly for the new equipment. Ductwork that is leaking, undersized, or deteriorated should be addressed as part of the replacement rather than left in place, because it will limit the performance of the new system from day one.
Yes. If the fault has a preventable cause, such as a filter that was not changed often enough or a drainage line that was not cleared, we explain what contributed to it and what to watch for going forward.
The process is the same as for any other call: the problem is scoped on the phone, the price is confirmed before the visit is scheduled, and the visit covers what was agreed. If a tenant needs to be present for access, that is noted when the appointment is arranged. Clear notes on what was found and what was done are provided after the visit, so the property owner has a record of the work regardless of whether they were on-site.
One call. One clear diagnosis. One price, agreed first.
You do not need to know what is wrong before you call. Describe what the system is doing and we will scope the visit on the phone, confirm the price, and schedule from there. No forms, no waiting for a callback before anyone looks at the system.
Call (650) 955-4592 to get a quote or schedule service with Los Altos HVAC Company. We are open every day from 9:00 AM to 8:00 PM.
Heating and cooling work also reaches these towns: Atherton, Stanford, Los Altos Hills, San Lorenzo, Ashland. Check 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 North Fair Oaks 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 |
|---|---|---|---|
| Heat Pump Repair & Service | Refrigerant charge check, Reversing valve inspection, Coil and compressor condition, Repair confirmed before work proceeds | Properties where the heat pump has stopped heating or cooling, or short cycles through both modes | Heat pumps handle both heating and cooling from one system, so a fault in one mode often points to a shared component worth checking in both. |
| Wildfire-Smoke Air Filtration (MERV-13+) | Compatibility check on existing air handler, MERV-13 or higher filter installation, Airflow assessment after upgrade, Review of filter replacement schedule | San Mateo County households affected by recurring wildfire smoke seasons who want filtration that goes beyond a standard residential filter | Standard one-inch filters are not rated to capture the fine particulates wildfire smoke carries. MERV-13 and higher addresses that gap, but the air handler needs to handle the added resistance without straining the blower. |
| 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