Heat Pump Repair in Atherton, CA
Heat pump repair in Atherton starts at the thermostat, and I mean that literally.
My own Atherton records are thermostats and indoor air quality gear ahead of anything mechanical. On a gas furnace a thermostat is close to a switch. On a heat pump it is not. Its configuration decides when the compressor gives up, when the auxiliary heat takes over, and whether the machine ever gets to do the efficient thing. A heat pump set up as though it were a furnace will heat your house perfectly well and hand you a bill that makes you think the equipment is failing.
Two things that are not faults, so you do not pay me to explain them at your kitchen table. Cool air for a few minutes while the outdoor unit steams is a defrost cycle. Give it fifteen minutes. And supply air that feels cool against your hand while the room temperature climbs is normal. A heat pump moves a lot of warm air, not a little hot air.
What is worth a call. Heat that never comes back after a defrost. Auxiliary heat running constantly. A system that cools in summer and will not heat in winter, or the reverse. A winter bill the weather does not explain.
I am John Towner. I own Silicon Valley Comfort, I do the work myself, and it is me who answers the phone. 408-691-5940.
Why heat pump repair in Atherton is its own job
I will be straight about what my Atherton records say about heat pumps, because the honest answer beats a confident one.
They do not say anything. There is no heat pump on my Atherton list. If your heat is a heat pump you are not the typical Atherton job in my records, and I am not going to invent a paragraph claiming otherwise.
What is on it is thermostats, more than anything else. That is not a consolation prize on a heat pump page. It is the most useful thing my file could have handed you, because the thermostat decides whether a heat pump behaves.
Four settings inside it decide most of how one lives. The balance point, the outdoor temperature below which the machine stops carrying the house alone. The staging, how big a gap it takes before the next stage comes on. The droop, how far behind the room falls before the strip heat is invited in. And the auxiliary lockouts, which keep that strip heat out of it above a given outdoor temperature.
Get any of those wrong and nothing looks broken. The house is warm, the equipment runs, the bill is the only symptom, and no part has failed. That is the fault I expect here more than a bad compressor, and the cheapest one to fix, which is exactly why nobody is selling it to you.
One more thing from the file. Every install year on it is 2021. Equipment that recent logs its defrost terminations, a different record from a furnace lockout counter, and it is the log I want in front of me before I touch a heat pump.
What actually fails on a Atherton heat
Three things account for most of what I find on heat pumps, and the famous one is not first.
Auxiliary heat running when it should not. This is the expensive one and it usually costs nothing in parts. Strip heat exists for the coldest hours and the few minutes after a defrost. If it energizes any time the thermostat sees a couple of degrees of difference, or got wired to run alongside the compressor instead of in place of it, the house stays warm, the bill climbs and nothing looks broken. Configuration and wiring, not a new machine.
Defrost that does not work properly. The coil frosts in heating, and the control has to notice, reverse the system, clear it, then terminate on the coil sensor rather than run out on a timer. When that sensor is loose, dirty or dead you get ice building until the unit is a block, or defrost cycles one after another so the house never gets warm. This is where the oak canopy earns its mention. Litter mats into that coil and sits on that sensor, and unlike an air conditioner the coil gets fouled in both directions, shedding heat in summer and pulling it out of cold air in winter.
Charge that is off. Heat pumps are less forgiving than air conditioners because they work both ways, and a unit added to serve one wing often runs a long line set nobody charged for its length. That reads as marginal heating when it is cold, marginal cooling when it is warm, and a compressor working harder than it should.
A reversing valve that will not shift does happen. I check it after the cheap causes, because good valves get condemned when the real problem is the control never telling them to shift.
Dual Fuel Systems On Big Houses
Many Atherton homes that added a heat pump kept the gas furnace as backup. In a dual fuel setup, the heat pump carries the house most of the year and the furnace takes over below a set outdoor temperature. When it is configured right, it is quiet and cheap to run. When the balance point is set wrong, the furnace runs on mild days it should not, or the heat pump struggles on cold mornings with no help.
Heat pump repair in Atherton on a dual fuel system starts with the controls: the outdoor sensor, the balance point, and how the thermostat stages the two. A surprising number of comfort and cost complaints are settings, not failed parts.
Defrost, Reversing Valves, And What Is Normal
On cold, damp mornings a heat pump frosts its outdoor coil and runs a defrost cycle to clear it. The outdoor fan stops, the system reverses for a few minutes, steam rolls off the coil, and heat returns. That is normal and it takes a few minutes. A defrost that never ends, ice that builds up on the bottom of the coil and stays, or a system stuck in cooling mode in January points at a defrost sensor, a defrost board, or the reversing valve.
The reversing valve is the part that lets a heat pump switch between heating and cooling. When it sticks or its solenoid fails, the system blows cool air when it should heat. Measuring line temperatures on both sides of the valve tells us whether the valve is the problem or something upstream is.
Ductless Systems In Guest Houses And Studios
Guest houses, pool houses, studios, and offices on larger properties often run on ductless heat pumps. One outdoor unit may feed several indoor heads. When one head underperforms and the rest are fine, the issue is usually specific to that zone: a dirty blower wheel, a restricted line, or an expansion valve. Each head gets its supply air temperature measured so the weak one stands out. When it is time to replace equipment, check that the exact outdoor unit and indoor heads are a matched rating in the AHRI directory. A mismatched combination can fall well short of the advertised efficiency.
A yearly check covers the outdoor coil, the defrost controls, the charge in heating mode, and the electrical, with the readings saved for next time.
Keep the outdoor unit clear of leaves and mulch.
When you book, tell us whether the system is dual fuel, ductless, or a straight heat pump, and which building it serves. Guest houses and studios often have their own equipment, and knowing that in advance means the right tools and parts come along. If the thermostat is showing an error code or an auxiliary heat message, write it down before calling.
How I diagnose it
A heat pump takes longer to diagnose than an air conditioner. I say that before I start rather than after.
The thermostat configuration comes first, not last. Balance point, staging, droop, auxiliary lockouts, and whether somebody left in defaults written for a much colder climate than this one. I read the settings, not the temperature on the screen. Where the complaint is a bill rather than a temperature, that is often the whole visit.
Then the data plate, then the system running in both modes.
Superheat and subcooling in heating and in cooling, because a charge that reads acceptable one way can be clearly wrong the other. An air conditioner call never needs that reading twice. A heat pump call always does.
Supply air temperature with the auxiliary heat locked out, then again with it available. That shows whether the heat pump has been doing the work or the strip heat has quietly carried the house all winter.
Compressor amp draw against rated load amps.
Then defrost, the step most often skipped because it takes time. I want to watch a cycle start, complete, and terminate on the coil sensor instead of timing out. Sometimes that means forcing one.
Static pressure across the air handler if the numbers point at airflow rather than refrigerant. If they do not, I leave it. On a heat pump that hour is better spent watching a defrost cycle.
Repair or replace
Most of what I find on a heat pump is a repair or a setting, and on a fair number of calls the fix needs almost no parts, because it was configuration the whole time.
Worth saying plainly, because the two look identical from the living room. A heat pump heating poorly while the strip heat carries the load feels exactly like one that is worn out. One is a settings problem that costs a service call. The other is a machine problem that costs a machine. Anyone quoting the second without measuring supply air with the strip heat locked out has not checked which you have.
So the replacement conversation on this page is short, on purpose.
A failed compressor, particularly one that has put acid through the system, is a real replacement.
A leak in the outdoor coil is usually a real replacement too, because on a heat pump that coil is a large share of what the unit is worth.
Past those two, I want the thermostat, the wiring and the defrost control ruled out before anybody prices equipment. That order matters more here than on an air conditioner, because a heat pump has twice as many ways to look broken while being mechanically fine.
And if your complaint is that the air just feels cool, hear me out before you spend anything. It may be airflow, it may be configuration, and it may be a system working exactly as designed that nobody ever explained to you.
Atherton neighborhoods I cover
A heat pump does something outdoors in winter an air conditioner never does. It makes water on purpose every time it defrosts, and that water has to go somewhere.
Atherton is flat. That is most of the problem in one word. On sloped ground the melt runs off on its own. Here it sits, and a wet mat of leaf litter under the coil freezes into a pad that blocks the bottom of the unit and traps the next round of ice. A unit on a raised pad with clearance underneath and drainage away runs its defrost cycles as designed. One set flush into a bed of bark does not.
Lot size decides which version becomes your problem. On the large parcels in West Atherton and Lindenwood the unit tends to sit far enough out that the meltwater is nobody’s business, and far enough out that nobody walks past it between October and April, so nobody sees it icing. Around Lloyden Park it is the reverse. You will notice the unit, because it is close, and so is the foundation and the fence line the water runs toward.
Either way, go and look at it once during a cold snap. Frost on the face of the coil is normal and defrost will clear it. Ice built up around the base of the unit, or a fan grille packed solid, is not, and that is worth a call the same day.
Straight Pricing, No Surprises
Residential Diagnostic
$99
Standard hours. After 6:00 PM, Saturdays, and holidays: $149. The standard diagnostic is credited toward your repair if you approve the work on the same visit.
Commercial Diagnostic
$199
Business hours. After-hours: $299. Light commercial, retail, and multi-family equipment.
Repairs and Installations
Quoted before we touch a wrench. Supplier invoice attached to your job sheet.
Heat Pump Repair Atherton: common questions
My heat pump is blowing cool air and steaming outside. Is it broken?
Almost certainly not. That is a defrost cycle. The system reverses itself to melt frost off the outdoor coil, so for a few minutes the indoor air goes cool and the outdoor unit throws steam. It should end on its own inside fifteen minutes. If the heat never comes back, or the unit runs defrost over and over without warming the house, that is worth a call.
Why did my winter electric bill jump when nothing feels different?
Usually because the auxiliary heat is doing work the compressor should be doing. Electric resistance heat is expensive compared with the heat pump itself, so if the thermostat brings it on too easily you get a comfortable house and a painful bill with nothing visibly broken. That is a settings and wiring check, and it is the first thing I look at here.
Can I keep my gas furnace and run a heat pump too?
Yes, and in houses that already run more than one system it is common. It can be one system with the furnace as backup heat, or separate systems serving separate parts of the house. Both work when the controls know which is which, and both throw confusing symptoms when they do not.
It cools fine in summer but will not heat. What does that tell you?
That the compressor and the basic refrigerant circuit are alive, which rules out a lot. It points at the heating side specifically. The reversing valve or the signal that shifts it, the defrost control, the outdoor sensor, or a charge that is only marginal in one direction. Tell me that on the phone. It narrows the job before I get there.
Do you work on ductless heat pumps as well as ducted ones?
Yes. Ductless is a reasonable answer where an addition or a wing has no ducting to work with, and the diagnosis is the same craft with different access. Fault codes come off the indoor unit, and plenty of ductless problems turn out to be a filthy blower wheel or a blocked drain, not the refrigerant circuit.