Belmont HVAC Company handles heating and cooling for homes, rental properties, and commercial buildings across Belmont and San Mateo County. Whether the call is for a repair, a seasonal tune-up, or a full system installation, heat pumps, furnaces and mini-splits all within scope. No guesswork. No shortcuts. No rushed diagnosis.
Call (650) 879-8929 for a quote.
From a quick tune-up to a whole-system replacement, the diagnosis comes first, and the service list covers everything in between. We work on residential properties of all ages, multi-unit buildings, and commercial spaces, handling the full range of heating and cooling work that keeps a property comfortable year-round.
Services include:
Reach out and we will talk through the symptoms.
Two calls come in more than any other: the heat stopped working overnight, or the AC quit on the warmest day of the month. Both situations get the same response. The symptom gets scoped on the phone before anything else happens.
A furnace that won't turn on, a heat pump blowing cold air when it should be heating, an AC pushing warm air through the vents, a compressor that won't respond, refrigerant leak symptoms that show up as ice on the lines or a steady drop in cooling output. These are all diagnosable, and they all start with a call.
When someone reaches us, the situation gets discussed, a visit is arranged, and the system is tested before the visit ends. We are available every day from 5:30 AM to 8:00 PM.
Call (650) 879-8929 if the system is down.
Ready for your system. Call now.
Belmont sits in a mild marine climate that historically kept air conditioning off most shopping lists. That has shifted after back-to-back heat events in recent years, and wildfire smoke seasons have made indoor air quality a practical concern rather than a luxury. At the same time, San Mateo County is one of the more active markets in California for gas-to-electric transitions. The three services below reflect what comes up most often here.
A large share of homes on the Peninsula were built without central air. Ductwork was never roughed in, and retrofitting it through finished walls and ceilings is disruptive and expensive. A ductless mini-split solves that directly. A wall-mounted air handler goes inside the room, an outdoor condenser unit sits outside, and a refrigerant line set connects the two through a small penetration in the wall. Individual zones can be controlled separately, which suits older construction with irregular floor plans. We handle the equipment installation and the low-voltage wiring between the indoor and outdoor units. One call is all it takes to get it looked at.
Bay Area wildfire seasons have made poor outdoor air a recurring reality, and the indoor air in a home without upgraded filtration reflects that. A standard HVAC filter is rated for dust and larger particles. MERV-13 and higher filtration captures fine particulate matter, including the particle sizes that carry the most risk during smoke events. Options include upgrading the filter media in an existing air handler, installing a whole-home air scrubber in the duct system, or adding a UV light system that handles biological contaminants alongside particulates. Compatibility depends on the current setup, and a visit determines what the existing system can support. HVAC service booked around your schedule means the assessment happens when it works for you.
A heat pump replaces both a furnace and an air conditioner in a single system, which is why the gas-to-electric transition in San Mateo County so often starts here. Two formats are common. A ducted heat pump connects to an existing forced-air distribution system and handles the whole house. A ductless heat pump mini-split works without existing ductwork and suits additions, older homes, or properties where a full duct system was never installed. The job involves removing the old heating unit, installing and commissioning the heat pump, and connecting it to the existing air distribution or configuring new air handlers where needed. We speak to the heat pump and the air-side installation. The household electrical circuit and disconnect are outside our scope. A written scope on installation work is provided before anything starts.
Choosing the right HVAC fix is easier than it sounds, and most repairs follow a clear path once the system is diagnosed.
On the cooling side, common calls involve refrigerant leaks, evaporator coil buildup that restricts airflow, condenser coil fouling from outdoor debris, and failed capacitors or contactors that leave the compressor or fan motor unable to start. Blower motor issues show up as weak airflow even when the system is running. An AC tune-up before summer covers the coils, refrigerant charge, electrical connections, and drain line, and it catches most of these problems before they become failures.
Furnace calls tend to cluster around the same symptoms: the furnace blowing cold air, the system failing to ignite, or the unit cycling on and off without reaching temperature. Gas furnace service includes inspecting the heat exchanger, testing ignition components, and checking the flue. Where a furnace has reached the end of its useful life, heating system replacement and new furnace installation are both within scope.
Heat pump and mini-split calls follow similar patterns. A heat pump blowing cold air in heating mode, a unit that won't turn on, or a system that runs but doesn't move enough conditioned air through the space. Heat pump maintenance, including coil cleaning, refrigerant checks, and defrost cycle verification, extends the service life of the equipment and keeps efficiency where it should be.
Ductwork and thermostat work rounds out the everyday list. Leaking ducts drive up energy costs and create uneven temperatures across a building. Duct sealing and air duct inspection address both. On the control side, a thermostat not reading correctly or failing to communicate with the system is a straightforward fix, and smart thermostat installation gives homeowners and property managers more precise control over schedules and set points. We will look at the system and tell you what it needs.
From aging systems to brand-new installs, commercial properties have different demands than residential ones, and the equipment reflects that. We handle repair, maintenance, and installation for offices, retail spaces, multi-unit residential buildings, and light industrial properties across the area.
Commercial work covers rooftop units, packaged systems, multi-zone configurations, and commercial heat pumps. A rooftop unit that trips out on a warm afternoon, a packaged system running at reduced capacity, or a multi-zone setup with uneven performance across floors. Commercial HVAC maintenance schedules keep these systems running between calls, and system-down diagnosis gets the right repair scoped quickly. The rate is confirmed before a visit is scheduled, and pricing is explained up front so there are no open questions before work begins.
One call is all it takes to get it looked at.
Heating and cooling work gets explained in plain terms. When you call, the situation gets discussed, the scope is outlined, and the rate is confirmed before anything is scheduled. That applies to repair calls, maintenance visits, and installation work alike.
On a repair visit, the technician diagnoses the system first and the repair scope is agreed before work begins. On installation work, the quote covers what is being installed, how the job will be approached, and what the visit includes. Questions about what is covered get straight answers on the call.
We are available every day from 5:30 AM to 8:00 PM.
Call (650) 879-8929 to get a quote.
Belmont is the primary service area, and we work across the surrounding Peninsula communities in San Mateo County as well. Residential and commercial properties throughout the region are within scope.
Nearby areas served include:
We serve Belmont as our primary area and work across San Mateo County, including San Carlos, Redwood City, San Mateo, Foster City, Burlingame, Millbrae, Hillsborough, and Half Moon Bay.
If your property is nearby, call (650) 879-8929 and we will confirm coverage when you reach out.
Most Peninsula communities in the county are within scope for both residential and commercial calls.
We are available every day from 5:30 AM to 8:00 PM, including weekends. That covers repair calls, tune-up visits, installation consultations, and urgent calls when a system goes down without warning.
Call (650) 879-8929 and we will get the job scoped on the phone before anything is scheduled.
Yes. We work on single-family homes, multi-unit rental properties, offices, retail spaces, and light commercial buildings across Belmont and San Mateo County. The diagnostic process is the same regardless of property type: the system gets looked at, the fault gets identified, and the price is confirmed before any work begins. Property managers and landlords are welcome to call with multi-unit or portfolio questions.
When you call, we discuss the situation, scope the job, and confirm the rate before anything is scheduled. The price you get on the call reflects what the visit covers, whether that is a diagnostic, a repair, or an installation. Ask what is included and you get a straight answer before we book anything.
The rate confirmed on the call is what the visit is booked at. On a repair call, the diagnostic happens first, and the repair scope and its cost are agreed before work begins. On installation work, a written scope is provided so you know exactly what is included before the job starts.
The most useful details are the equipment type (furnace, heat pump, central AC, mini-split), the symptom you are seeing, and roughly how old the system is if you know it. If the system has a make and model on the data plate, that helps too. The more the call covers upfront, the more accurate the scope and price will be before anyone comes out.
Warm air blowing from the vents when the AC is running, a furnace that cycles on and off without reaching temperature, weak airflow from the registers, or unusual sounds like banging, grinding, or rattling from the unit are all reasons to call. A burning smell from the vents or around the equipment is a reason to shut the system off and call immediately. These symptoms tend to get more expensive the longer they go unaddressed.
A rattling or humming sound during normal operation can often wait for a scheduled visit, but a banging or grinding noise from the compressor or blower motor is worth shutting the system off for.
Call (650) 879-8929 and describe what you are hearing.
We can help you decide on the phone whether the system should stay off until someone looks at it.
Lead times depend on the season and how busy the schedule is. Routine tune-ups and maintenance visits are easier to book in the shoulder seasons before peak demand hits in spring and fall. Repair calls and urgent situations are handled as quickly as the schedule allows.
Call (650) 879-8929 and we will tell you what is available when you reach out.
A repair is the right call when the fault is isolated and the cost of fixing it makes sense relative to the age and condition of the equipment. Replacement becomes the better path when repair costs are stacking up, the system is past its useful service life, or the equipment simply cannot meet the load the space demands. The diagnostic visit answers that question directly: we look at the system, explain what it needs, and give you both options where both apply.
On a repair call, the cost is confirmed after the diagnostic, so the quote reflects the actual fault rather than a guess. On installation work, factors that affect the final scope include whether existing ductwork needs attention, whether the electrical disconnect is already in place (that work belongs to an electrician), and whether the new equipment requires different line sets or mounting than the old unit. All of that gets covered in the written scope before the job starts.
We cover repair, maintenance, and installation for residential and commercial properties, every day from 5:30 AM to 8:00 PM. Belmont HVAC Company is the call to make when the system needs attention, whether that is a straightforward repair or a full replacement. System tuned. Airflow balanced. Home comfortable.
Call (650) 879-8929 for a quote.
We handle the full range of heating and cooling work in Belmont 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. |
| Heat Pump Repair & Service |
| Homes in Belmont already running a heat pump that is not reaching temperature or switching modes incorrectly | Belmont's mild winters are well suited to heat pump operation. A system that blows cool air in heating mode often has a reversing valve or refrigerant fault. |
| Heat Pump Electrification |
| Belmont homeowners replacing a gas furnace or older AC and looking to move to an all-electric heating and cooling system | California's incentive environment has made heat pump electrification more cost-competitive. The electrical circuit and disconnect are handled as part of the installation scope. |
| 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. |
| Heating & Furnace Repair |
| Households where the furnace is not igniting, cycling off early, or producing less heat than expected | Fall is the busiest window for furnace calls. Scheduling before the first cold stretch means shorter waits and a system ready when temperatures drop. |
| Seasonal Maintenance & Tune-Ups |
| Homeowners who want to catch a marginal component before it becomes an emergency call | A spring AC tune-up and a fall furnace tune-up are the two most common schedules. Either visit can surface a developing fault before the peak season puts the system under full demand. |
| Indoor Air Quality & Air Filtration |
| Households dealing with dust, allergens, wildfire smoke, or occupants with respiratory sensitivities | Filtration upgrades are most effective when the air handler and duct system are assessed together. A filter upgrade that strains the blower can reduce airflow across the whole system. |
| Ductwork Repair & Sealing |
| Homes with uneven temperatures between rooms or energy bills that have crept up without an obvious cause | A duct system with significant leakage loses conditioned air into the attic or crawl space before it reaches the register, making the equipment look like the problem when the ducts are. |
| Wildfire-Smoke Air Filtration (MERV-13+) |
| Bay Area households with respiratory concerns or homes that experienced smoke infiltration during fire events | Not every air handler can pull air through a denser filter without straining the blower. We check compatibility before upgrading the filtration media. |
| Thermostat & Smart Controls |
| Homeowners who want better schedule control or whose current thermostat is reading inaccurately | A thermostat placed in direct sunlight or near a heat source will run the system in ways that do not match the rest of the house. Location matters as much as the unit itself. |
| Ductless Mini-Split Installation |
| Older Belmont 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. |
| Emergency HVAC Service |
| Any household or commercial property where the heating or cooling system has stopped working entirely | We take emergency calls every day from 5:30 AM to 8:00 PM. The scope and the price are discussed on the phone before anyone is sent out. |
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