The short answer
We repair every common heating type found in Atherton homes: gas furnaces, boilers and radiant floors, heat pumps, ductless mini-splits, wall heaters and the thermostats and zone controls that tie them together. Each visit starts by pinning down which system serves the cold area.
Heat in an Atherton house can come from more places than a single furnace. Over the decades, homes in 94027 have collected boilers feeding radiant floors, wall heaters in additions, heat pumps installed during remodels, and ductless heads in pool houses or offices. ExpertFlow HVAC Repair Service repairs all of them, making the nine-mile drive northwest from Los Altos into San Mateo County. When a room goes cold, the first job is to identify which heat source serves it, then trace the fault through that system's controls, power and distribution.
Heating systems we see in 94027
Knowing what you have helps us bring the right tools and parts. Tell us which of these you are dealing with when you call:
- Forced-air gas furnaces, single or multiple, in attics, basements, closets or crawlspaces
- Hot water boilers serving radiant floor loops, baseboard convectors or panel radiators
- Ducted heat pumps that replaced an older furnace and AC pair
- Ductless mini-split heads in additions, studios or guest quarters
- Gas or electric wall heaters in older wings and converted spaces
- Zone panels, dampers and smart thermostats that coordinate several systems
Radiant and boiler problems
Hydronic heat is quiet and even, which is why owners love it, but its faults are less obvious than a furnace's. A floor that warms in one room and stays cool in the next often points to a stuck zone valve, a failed actuator, or air trapped in a loop. A boiler that short-cycles may have a pressure problem, a faulty low-water cutoff, or a circulator pump that is wearing out.
We check system pressure, purge air where needed, test each zone valve and circulator, and look at the expansion tank and relief valve. On modulating condensing boilers we also review the control settings, since an outdoor reset curve set too aggressively can make the house feel cold on damp mornings.
Heat pumps in heating mode
A heat pump that blows lukewarm air in winter is not always broken. Supply air from a heat pump is cooler than furnace air by design. But a unit that never catches up, frosts over without defrosting, or keeps switching to electric backup strips needs a closer look. Common causes include a failed reversing valve, a defrost sensor or board fault, low refrigerant, or a thermostat configured for the wrong equipment type.
We test the reversing valve, defrost cycle, refrigerant circuit and auxiliary heat staging, then make sure the thermostat is set up for heat pump operation. Getting that configuration right often fixes complaints about high electric bills as well.
Controls that tie several systems together
In a large home, the trouble is sometimes not the equipment at all. A zone board that has lost a relay, a damper motor stuck closed, or a smart thermostat that lost its Wi-Fi schedule can all leave one area cold while everything else runs normally. We test low-voltage wiring, zone relays and damper operation, and we can simplify an overcomplicated control setup if it has become hard to live with.
Repairs and the Air District rules
If your gas furnace or boiler is old, you may have heard about new Air District requirements. The rules do not require replacing working equipment. For furnaces, Rule 9-4 sets a zero-NOx standard for units manufactured from 2029, so a future replacement will likely point toward a heat pump. Repairing what you have today is perfectly allowed, and usually the right first step.
When repairs start piling up, we can price a replacement alongside the repair so you can compare. Local electrification incentives through BayREN or your clean energy provider change by funding cycle, and we confirm what is available before quoting it.
Neighboring areas
Heating repair calls from Menlo Park, Palo Alto, Portola Valley, Los Altos Hills and East Palo Alto are handled by the same Los Altos team. Damp Peninsula winters rarely bring hard freezes, but a cold house is still miserable, so let us know which rooms are affected and what kind of system serves them.
More services in Atherton
- AC Repair in Atherton
- Heat Pump Installation in Atherton
- AC Installation in Atherton
- Furnace Repair in Atherton
