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 losing the fight against a 90-degree Pittsburg afternoon, icing up or tripping its breaker? HAXX repairs ducted and ductless heat pumps citywide.
Serving Old Town, Oak Hills, San Marco, Vista Del Mar, Highland Meadows and Hillsdale and the rest of Pittsburg. 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.
Pittsburg sits in the Mt. Diablo rain shadow, with average June and July highs near 90°F. A heat pump here does heavy cooling duty, and summer is when weak parts give out.
Capacitors, contactors, outdoor fan motors and dirty condenser coils fail most often when the unit runs for hours in East County heat.
Reversing valves, defrost boards and sensors cause a heat pump that blows cold in winter. Each is tested before any part is quoted.
HAXX holds C-10 electrical and C-20 HVAC licenses, so a burnt disconnect, breaker or control wire is handled by the same team.
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 failed capacitor, a stuck reversing valve, low refrigerant or a clogged outdoor coil. HAXX checks each one before recommending a fix.
HAXX repairs both ductless mini-splits and ducted heat pump systems, including multi-zone setups.
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.
