The short answer
We repair every common heating system found in Alhambra homes: central gas furnaces, older floor and wall furnaces, heat pumps and ductless mini-splits. Each visit starts with a safety check and a clear explanation of what failed before any repair begins.
Heating in Alhambra comes in more varieties than people expect. Walk down a single block in 91801 and you might pass a house with a central gas furnace in the attic, a bungalow still warmed by a floor furnace in the hallway, a condo with a wall heater in the living room and a remodel running a ductless heat pump. Each of those fails in its own way, and each needs a technician who recognizes it. SummitAir HVAC Contractors handles heating repair for all of them, sending technicians about four miles south from Pasadena to Alhambra and to nearby South Pasadena, San Gabriel, Monterey Park, San Marino and Rosemead. This page is organized by type of system, so you can jump to the one in your home and see what usually goes wrong, what we check and what choices you have.
Floor and wall furnaces in older houses
Gravity floor furnaces and recessed wall heaters are still in service in plenty of older Alhambra homes. They are simple appliances, but age catches up with them: thermocouples wear out, pilot lights will not stay lit, gas valves stick, and grilles collect years of dust and debris that can scorch when the heater fires.
We clean and test the burner and pilot assembly, check gas pressure and look closely at venting, because these units rely on natural draft. If parts are no longer available or the unit shows signs that it is unsafe to keep using, we explain that directly and talk through replacement options, including ductless heat pumps that fit homes without ducts.
Central forced-air systems
Ducted furnaces are the most common setup in houses here. When one stops heating, the cause is often in the ignition sequence, such as an igniter, flame sensor or pressure switch, or in airflow, such as a clogged filter, a failed blower or a disconnected duct in the attic.
Uneven heating deserves its own mention. If the furnace runs fine but one bedroom never warms up, the problem is often in the ductwork rather than the furnace. Attic ducts in older homes come loose, crush under stored items or were never sized for a later addition. We inspect them as part of the visit rather than replacing parts that are not at fault.
Heat pumps and ductless systems in heating mode
Heat pumps reverse the refrigerant flow to bring heat indoors. Typical heating-mode problems include a stuck reversing valve, defrost controls that fail and let the outdoor coil ice over, sensor faults and refrigerant leaks that show up first as weak heat.
Ductless mini-splits add their own issues: dirty indoor filters and coils, blocked condensate lines and communication errors between the indoor head and the outdoor unit. We read error codes, test sensors and pressures, and clean what needs cleaning.
- Outdoor unit iced solid and not clearing: defrost control or sensor fault
- Air from the vents feels cool in heat mode: reversing valve or refrigerant problem
- Indoor head blinking an error code: communication, sensor or board issue
- System heats but much more slowly than last winter: dirty coils, low charge or airflow restrictions
Thermostats and controls
A surprising number of no-heat calls come down to the thermostat or its wiring. Batteries die, smart thermostats lose their configuration after an update, wires loosen at the terminal, or a thermostat meant for a gas furnace was installed on a heat pump. We check the control side early so you are not paying for a part the equipment never needed.
Safety comes first on every call
Any fuel-burning heater gets a carbon monoxide check and a look at its venting before we leave. If we find a cracked heat exchanger, a damaged flue or a gas leak, we explain the risk and will not leave the appliance running in an unsafe condition. If you ever smell gas, get everyone outside and contact the gas utility from there before calling us.
When a repair is not worth it, we help you plan ahead. South Coast AQMD Rule 1111 limits NOx emissions from fan-type gas furnaces sold and installed in the region and has been amended toward zero-emission requirements, with compliance dates the district sets and revises. Utility rebates depend on whether your address is served by Southern California Edison or LADWP, and we confirm current offers before quoting them.
More services in Alhambra
- AC Repair in Alhambra
- Heat Pump Installation in Alhambra
- AC Installation in Alhambra
- Furnace Repair in Alhambra