Whether a system can be repaired or needs to come out entirely is almost always the first question on the call, and it is the right one to start with. We scope the situation on the phone before anything is scheduled, so you have a real answer rather than a guess before anyone comes out.
We cover heating and cooling for homes, rental properties, and commercial spaces across South San Francisco. The city has a mix of residential construction and light commercial buildings that generates the full range of HVAC work: first-time cooling installs in homes that were never set up for air conditioning, furnace repairs in older properties, heat pump replacements, and commercial rooftop units that need attention before they take a building out of service.
Call (650) 879-8929 to get the conversation started. We are available every day from 5:30 AM to 8:00 PM.
Getting your comfort back is easier than you think, but the path to it depends on what the system is actually doing. These are the situations that most often lead to a call.
A sound that was not there last week is worth paying attention to. A rattling from the air handler often points to a loose component in the blower assembly. A grinding or squealing sound from the outdoor unit is frequently a bearing failing in the fan motor or compressor. A banging sound on startup can mean something has come loose inside the cabinet. None of these are the same repair, and the diagnostic visit establishes which one it is before any work is quoted.
A furnace that will not ignite, one that starts and shuts off before the house reaches temperature, or one that runs but blows air that never gets warm are three different problems with three different causes. Ignition component failure, a tripped limit switch, and a heat exchanger issue each produce symptoms that can look similar from the thermostat. We work through the system from the controls down to the burner assembly to find the actual fault, not the most common one.
When a room is added to a home, the existing duct system is rarely extended to match. The result is a space that the equipment cannot properly reach, and the rest of the house often suffers too because the system is now pushing air through a layout it was not designed for. Duct design for an addition means assessing what the current system can support, sizing the new branch correctly, and sealing the connection so conditioned air reaches the room rather than bleeding into the wall cavity.
Standing water near an air handler or furnace is usually a condensate drain problem. The drain line that carries moisture away from the evaporator coil can clog with algae or debris, and when it does, water backs up into the drain pan and eventually onto the floor. Clearing the line and inspecting the pan and the coil is a straightforward repair when it is caught early. Left alone, it leads to coil damage and, in some cases, water damage to the surrounding structure.
The honest answer is that the price depends on what the system actually needs, and that does not become clear until the diagnostic is done. A repair call that turns out to be a failed capacitor costs a different amount than one that uncovers a refrigerant leak alongside a fouled evaporator coil. Both can start with the same symptom at the thermostat.
What moves a quote in one direction or another is the fault itself, how accessible the equipment is, and whether repair is the right answer or whether replacement makes more sense given the age and condition of the system. On installation work, the scope covers what is being installed, whether existing ductwork needs attention, and what the connection to the distribution system involves. A written scope on installation work is provided before anything starts, so there are no open questions once the job is underway.
When you call, the situation gets discussed and the rate is confirmed before anything is scheduled. Ask what is included and you get a straight answer. HVAC service booked around your schedule, whether that is early morning or a weekend appointment.
If a previous diagnosis did not sit right, or if the repair that was done did not hold, those are both good reasons to call. A second opinion on a system that was quoted for full replacement is worth having before that decision is made. In some cases the original diagnosis was correct. In others, a different technician working through the system finds a fault that was missed or a repair path that was not offered.
We also take over work that was started by somebody else and not finished. That happens more often than it should, and the approach is the same regardless of how the job got to that point: the system gets assessed from where it stands, the scope of what remains is established, and the price reflects that scope. One call is all it takes to get it looked at.
A system that stops heating or cooling entirely gets treated differently than a routine repair. When there is no heat in the house or no cooling and the weather is not cooperating, we take those calls and arrange visits as quickly as the schedule allows. The scope is confirmed on the phone so the visit is set up correctly before anyone arrives.
For tenants and businesses that need to stay operational, access and timing get worked out on the call. A commercial space that cannot close for a repair, or a rental property where the tenant needs advance notice, are both situations we handle regularly. The system tested before the visit ends is how we confirm the repair held, not how we assume it did.
We are available every day from 5:30 AM to 8:00 PM. If you want to see the whole range first, try our services page.
Call (650) 879-8929 and we will work out what the schedule allows.
Older homes and buildings in South San Francisco present a specific set of challenges that newer construction does not. Equipment that is past the point where parts are readily available, ductwork that was sized for a smaller or differently configured property, and systems that have been repaired multiple times without the underlying issue being resolved are all common.
When a system is old enough that a repair would cost more than the equipment is worth, or when parts are no longer available for the make and model, replacement is usually the more practical path. We walk through both options where both apply and give you the numbers before any decision is made.
Additions and renovations that were never properly connected to the existing HVAC system are a related problem. A room that was added without extending the ductwork, or a garage conversion where the heating and cooling was never addressed, leaves the space uncomfortable regardless of how well the main system is running. Ductwork repair and sealing, or a ductless mini-split for a space that cannot be practically reached by the existing distribution system, are both within scope.
For rental properties, the call often comes from a property manager or landlord rather than the person living in the unit. That changes how the visit gets arranged. Access needs to be coordinated with the tenant, and the invoice typically goes to the owner or the management company rather than to whoever was home when the work was done.
We handle that coordination on the call. The scope of the work is confirmed with whoever is authorizing it, the tenant is factored into the scheduling, and the documentation reflects what was done and what was found. A property manager handling multiple units across the city, or a landlord with a single rental, gets the same process either way.
Preventive maintenance visits are worth scheduling before a system fails rather than after. A seasonal tune-up that catches a component that is starting to degrade costs less than an emergency repair call in the middle of a heat event. We will look at the system and tell you what it needs.
South San Francisco is our primary focus in this part of San Mateo County, and we work across the neighboring communities as well. Brisbane, San Bruno, Millbrae, Colma, and Burlingame are all within the area we cover for both residential and commercial calls.
If your property is in the area and you are not sure whether we cover it, call and we will confirm when you reach out. Most of San Mateo County is within scope. We pick up the phone and take care of it.
Yes. We work on equipment regardless of who installed it originally. The make, model, and condition of the unit matter more than its history. If you have the equipment documentation, that helps, but it is not required to get a diagnostic visit booked.
Someone needs to be able to provide access to the equipment. That can be the tenant, a property manager, or the landlord, depending on how the property is managed. We work with whoever is available, as long as access to the system is arranged before the visit.
Yes. A thermostat upgrade is a standalone job and does not require other system work to be done at the same time. If the existing control is not reading correctly, is failing to communicate with the system, or simply lacks the scheduling features you want, a thermostat replacement is a straightforward visit.
It depends on the building. Adding ductwork to a home that was never built with it involves running ducts through walls, ceilings, or a crawl space, which is a significant job. In many cases, a ductless mini-split system is the more practical approach for homes without existing ductwork. We assess the building on the visit and walk through both options.
Maintenance visits for occupied commercial spaces get scheduled around the building's operating needs, and access and timing are worked out on the call before anything is booked. A rooftop unit or packaged system that serves an office or retail space can usually be serviced without disrupting the tenants, and we confirm what the visit involves before anyone arrives.
Call (650) 879-8929 and describe the property and we will work out what the schedule allows.
Yes. If a property has multiple systems, we can assess them on the same visit. Let us know when you call how many systems are involved and where they are located so the visit can be scoped correctly.
The most common path for a home without existing ductwork is a ductless mini-split, which mounts an air handler on the interior wall and connects to a compact outdoor unit through a small wall penetration. For homes that already have a forced-air furnace and ductwork in reasonable condition, a central AC installation may be the more efficient option. The visit determines which approach fits the property, and the scope and price are confirmed before any work begins.
The question of whether to repair or replace does not have a default answer, and a page cannot give you one. What the system actually needs, what it would cost to bring it back to proper function, and what a replacement would involve are all things that get established on the call and confirmed on the visit. We give you both numbers where both apply, so the decision is yours once you have the full picture.
Call (650) 879-8929 for a quote. We are available every day from 5:30 AM to 8:00 PM.
There is more on our list of local areas. We serve these towns nearby as well: San Bruno, Millbrae, Burlingame, Daly City.
We handle the full range of heating and cooling work in South San Francisco 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 |
|---|---|---|---|
| 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. |
| 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. |
| Ductless Mini-Split Installation |
| Older South San Francisco 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