When a heating or cooling system stops doing its job, the house tells you in stages. A room that used to hold temperature no longer does. The system runs longer than it should, or shuts off before the space is comfortable, or makes a sound it never made before. The fault is not always obvious from the outside, and guessing at it is how a repair bill grows. When you call, the situation gets discussed on the phone before anything is scheduled. The scope is confirmed, the price is agreed, and the visit is arranged around what the system actually needs. No guesswork. No shortcuts. No rushed diagnosis.
San Mateo is a city with a wide mix of housing: older single-family homes that were built before central air was standard on the Peninsula, newer construction with more complex multi-zone configurations, and a significant stock of multi-unit residential and commercial buildings whose systems run harder and get less attention than they should. We handle all of it, from a straightforward repair call to a full system replacement.
Call (650) 879-8929 to get the conversation started.
The price for any job depends on what the fault turns out to be, what the system requires to fix it, and whether repair or replacement is the better answer once someone has actually looked at the equipment. A repair that involves a failed capacitor and one that involves a refrigerant leak and a compromised coil are not the same job, and quoting them the same way would not be honest.
When you call, the situation is scoped on the phone. You get a rate before anything is booked, and you know what the visit covers before it happens. On a repair call, the diagnostic comes first and the repair price is agreed before work begins. On installation work, a written scope is provided so the job is defined before it starts. Ask what is included and you get a straight answer.
What moves a quote is straightforward. The fault itself, how accessible the equipment is, whether the existing ductwork or air distribution needs attention alongside the main repair, and whether the system is a candidate for repair or has reached the point where replacement is the more practical path. Those are the variables. The price is confirmed once they are known, not before.
If a system was repaired recently and the same problem has come back, or if the repair resolved one symptom and a different one appeared shortly after, a second look is worth having. We take over jobs that were started elsewhere and we handle calls where a previous repair did not produce the result the customer expected. The diagnostic starts from scratch rather than from the prior technician's notes, because the goal is to find what is actually happening in the system, not to confirm what someone else concluded.
Work that was started and not completed is a different situation. Before we continue anything, we assess what was done, what is still outstanding, and whether the approach taken so far is the right one. The scope and the price are agreed before any further work begins. One call is all it takes to get it looked at.
A system's rated efficiency is a laboratory number. What a property actually sees once the equipment is installed and running depends on factors the rating does not account for: the condition of the ductwork, how well the system was sized for the load, how the building is insulated, and whether the controls are configured to match how the space is used.
A high-efficiency unit installed in a duct system that leaks conditioned air into the attic before it reaches the registers will not perform the way the spec sheet suggests. Duct sealing addresses that directly. A system that was oversized for the space will short-cycle, which drives up wear and reduces efficiency regardless of the equipment's rated output. Sizing matters as much as the unit itself.
Energy-efficiency upgrades make the most sense when the whole picture is understood. That means looking at the equipment, the distribution system, and the controls together rather than treating them as separate problems. A smart thermostat upgrade, for example, delivers its full benefit only when the system it is controlling is running correctly. We will look at the system and tell you what it needs.
When a system goes down entirely, the situation changes. No heat in a San Mateo home on a cold night, no cooling during a stretch of unusual heat, a commercial space that cannot stay open without a functioning system: these are calls we take seriously. We are available every day from 5:30 AM to 8:00 PM. The scope is confirmed on the phone so you know what the visit covers before anyone arrives.
A rental property with a system down has a different urgency than a vacant unit, and a commercial space that has to stay open during a repair has different constraints than a single-family home. HVAC service booked around your schedule means the visit happens when it works for the property, not just when it is convenient for us. Property managers and landlords handling multiple units are welcome to call with questions about how we approach multi-unit work.
A zoning system divides a building into independently controlled areas, each with its own thermostat or sensor, so a home office that runs warm does not force the rest of the house to overcool. In a city where multi-story homes and open floor plans are common, zoning is often the answer to a comfort problem that equipment alone cannot fix. We handle zoning installation, zoning repairs, and comfort-control upgrades, including smart thermostat and programmable control configurations that give more precise management over how a system runs throughout the day.
A room that never reaches the set temperature is not always a sign of failing equipment. Leaking or poorly sealed ductwork bleeds conditioned air into unconditioned spaces before it reaches the register. A damper that is stuck or misconfigured can starve one zone while over-delivering to another. Airflow and uneven-temperature troubleshooting starts with the distribution system, not the unit, because the fault is often there rather than in the equipment itself. Ductwork repair and sealing is part of the regular scope.
A cracked heat exchanger is one of the more serious faults a furnace can develop, because it allows combustion gases to mix with the air circulating through the home. It does not always produce obvious symptoms. A heat exchanger inspection is part of a thorough furnace service call, and it is the right call whenever a carbon monoxide detector has activated near the furnace, or whenever a furnace is producing a smell the homeowner cannot place. If the heat exchanger is compromised, the repair options and the replacement options are both explained before any work begins.
A full HVAC system replacement is the right answer when repair costs are recurring, when the equipment is no longer able to meet the load the space demands, or when the system is old enough that its efficiency has dropped significantly relative to current equipment. Central air installation in a home that has never had it, a heat pump replacing a gas furnace as part of an electrification project, or a like-for-like swap of aging equipment: all of these fall within scope. The written scope provided before an installation job covers what is being replaced, what the new system includes, and what the visit entails. Questions about the equipment get answered before anything is booked. Each service is described in more depth on the page covering our heating and cooling services.
We cover San Mateo and the surrounding communities across San Mateo County. Residential and commercial properties throughout the area are within scope, whether the call is for a repair, a maintenance visit, or a full system installation.
Neighboring communities we serve include:
If your property is nearby, call (650) 879-8929 and we will confirm coverage when you reach out. Most of the county is within the regular service area.
Duct problems are found through a combination of airflow measurement, visual inspection where the ducts are accessible, and in some cases pressure testing. Leaks in an attic or crawl space are often visible once the space is entered. Leaks inside finished walls are harder to locate without more involved testing. We describe the approach and what it covers when the job is scoped.
Yes. After an installation, the equipment documentation, including any registration materials that came with the unit, is handed over to you. Keep those records with the property file. If you need them for a future service call or a property sale, having the model and serial number on hand speeds up the process.
Older homes in the area were often built without central air and may have ductwork that was added later and never properly sealed or balanced. That history matters when diagnosing a comfort problem, because a system that appears to be underperforming may actually be fighting a distribution issue rather than a mechanical one. When you call, describing the home's setup helps scope the visit accurately before anyone comes out.
A humidifier or dehumidifier installation adds to the existing HVAC system rather than repairing it. A whole-home humidifier typically connects to the air handler and the ductwork, conditioning the air as it circulates. The visit covers compatibility with the existing equipment, placement, and how the control integrates with the thermostat. It is scoped and priced the same way as any other job: discussed on the phone, confirmed before the visit, and explained before work begins.
Yes. If the visit uncovers a secondary issue that is not part of the original scope, we flag it and discuss whether to address it on the same visit or schedule a separate one. Nothing outside the agreed scope is done without your approval first.
Yes. Multi-unit properties have their own scheduling and access considerations, and we work with property managers and landlords who need repairs or replacements handled across more than one unit. The process is the same as a single-family call: the scope is confirmed on the phone, the price is agreed before work begins, and the visit is arranged around what the property needs.
The answer to that question is not something this page can give you. It depends on the age and condition of the equipment, what the fault turns out to be, and what a repair would cost relative to what a replacement would run. The only way to know is to have someone look at the system and explain both options honestly. That is what the diagnostic visit is for.
Call (650) 879-8929 every day from 5:30 AM to 8:00 PM.
The scope is confirmed on the phone, the price is agreed before anything starts, and the system is tested before the visit ends. System tuned. Airflow balanced. Home comfortable.
Browse our list of local areas. We also take heating and cooling work in: Foster City, Burlingame, San Carlos, Millbrae, Redwood City.
We handle the full range of heating and cooling work in San Mateo and across San Mateo County, from a single-room ductless install to a whole-system replacement on a commercial property. The table below covers every service we offer, who it fits best, and what is worth knowing before you call. If you have questions about a specific job, call us and we will talk through what the work involves before anything is scheduled.
| System Service | What the Service Includes | Best For | What to Keep in Mind |
|---|---|---|---|
| AC Repair & Service |
| Homeowners or property managers with a system that has stopped cooling or is underperforming | A system that runs but does not cool often has a refrigerant, coil, or compressor issue rather than a simple part failure. Diagnosis comes before any repair quote. |
| Full System Installation & ReplacementMost Popular |
| Homeowners whose system is aging, repeatedly failing, or unable to keep pace with the home's demands | An oversized unit short-cycles and wears out faster. An undersized one runs constantly. Correct sizing is confirmed before equipment is ordered. |
| Ductless Mini-Split Installation |
| Older San Mateo homes without existing ductwork, additions, or spaces where central air cannot reach | Many Peninsula homes built before the 1980s have no duct system. A mini-split avoids the cost of running new ductwork through finished walls and ceilings. |
Call us at (650) 879-8929 to talk through your system, get a price, and find out what the visit covers before anything is scheduled.
(650) 879-8929