No heat or no cooling
Checking the thermostat call, outdoor unit, reversing valve and controls to find why the system runs but does not heat or cool.
Heat pump short cycling, frosting over or heating with cold air? HAXX troubleshoots and repairs ducted and ductless heat pumps in San Anselmo homes.
Serving Sleepy Hollow, Red Hill, the Seminary area, Hawthorne Hills, Yolanda and the downtown flats along San Anselmo Creek and the rest of San Anselmo. Share your address to confirm availability.

Ducted systems, ductless mini-splits and multi-zone heat pumps. Tell us what the system is doing and we start the visit with that symptom.
Checking the thermostat call, outdoor unit, reversing valve and controls to find why the system runs but does not heat or cool.
Some frost in winter is normal. A unit that stays iced points to airflow, refrigerant or defrost-control problems.
Blinking lights and error codes on Mitsubishi, Daikin, Fujitsu and other ductless systems, traced to the sensor, board or refrigerant issue behind them.
Units that start and stop, rattle, hum or trip the breaker are checked for electrical, airflow and sizing problems.
Clogged condensate lines and drain pumps cleared and tested before water damages the wall.
If the system is not worth fixing, you get the reasons in writing and options to compare, not pressure.
San Anselmo heat pumps sit on hillside decks in Sleepy Hollow, in side yards on Red Hill and on raised pads in the creek flats. Placement drives many of the faults we see.
Shaded, damp lots under oaks and redwoods keep outdoor coils wet in winter. Failed defrost boards and outdoor sensors are a frequent cause of weak heat.
Long line-set runs up hillside lots can develop leaks at flare joints. HAXX locates the leak before recharging.
HAXX holds both C-10 electrical and C-20 HVAC licenses, so tripping breakers, disconnects and control wiring get checked on the same call.
Rated 4.8 across 515+ reviews on Housecall Pro, Google and Facebook. Read more reviews.
“Thorough diagnostics of A/C system, identified and repaired the issue quickly!”
“Service was performed well and on time. Service person was highly skilled and provided easy to understand options to deal with the issue. Price for diagnostics was reasonable and easy to pay online.”
“Our commercial building had several HVAC problems, and their team carefully diagnosed each unit, explained the available options, and never pressured us into unnecessary replacements. They worked hard to repair what could be repaired and kept us informed throughout the process.”
Brand, model and what it is doing. Photos of the label or error code help.
The technician tests the system and finds the cause, not just the symptom.
You see the repair price before work starts, and the options if a repair is not worth it.
The repair is completed and tested, or scheduled once the part arrives.
A closer look at recent heating and cooling work by HAXX.

On site during a commercial VAV box repair: access above a suspended ceiling, equipment and the work in progress.
Explore recent projects
Heat pump air handler service.

Compressor replacement.

Mitsubishi leak detection.

After-hours system repair.

Heat pump installation.

Outdoor heat pump installation.

Heat pump air handler installation.

Lennox ac installation.
Common causes are a defrost cycle that will not end, a stuck reversing valve, a bad sensor or low refrigerant. HAXX tests each before recommending a repair.
Yes. HAXX services units on decks, roofs and hillside pads, including multi-zone ductless systems.
It depends on the fault, the refrigerant the system uses and the condition of the compressor and coils. HAXX explains the repair cost against replacement options so you can decide.
Yes. HAXX services wall, ceiling cassette and ducted mini-split heads, single-zone and multi-zone.
Share the property, equipment and questions you have in mind.
(408) 901-8315
Call HAXX to discuss your property and scheduling.
