The short answer
Heating problems in San Gabriel tend to appear at the start of the cool season, after months of inactivity, and again during the coldest stretch of winter. SummitAir repairs furnaces, wall and floor heaters and heat pumps, with gas safety checks on every visit.
Few people in San Gabriel think about their heater until the first night in late fall when the house feels cold and nothing happens after the thermostat clicks. By then the system has been idle for months, and whatever weakened during that time shows up all at once. SummitAir HVAC Contractors handles heating repair for houses, townhomes and small multi-unit buildings in ZIP 91776, a short drive of about four miles from our base in Pasadena. We work on gas furnaces, wall heaters, floor furnaces and heat pumps. Below is a season-by-season look at heating trouble in this part of the valley and the repairs that usually solve it.
First cold night of the season
The most common calls come right when heating season starts. A furnace that worked fine last February suddenly clicks and quits, or a wall heater pilot will not stay lit. Typical culprits include a coated flame sensor, a cracked igniter, a thermocouple at the end of its life, a pressure switch hose that cracked in attic heat, or a dead thermostat battery that nobody noticed while the AC was off.
Many of these are quick repairs once diagnosed. The key is testing each step instead of swapping parts until something works.
Deep winter problems
Once the system has been running steadily for a few weeks, a different set of issues appears. Blower motors that were already weak begin to overheat. Filters fill with dust and lint, starving the furnace of air and causing it to shut down on its high-limit switch. Heat pumps run defrost cycles more often on cold, damp mornings, and a faulty defrost board or sensor can let the outdoor coil ice over.
In homes with attic ducts, a disconnected run that went unnoticed in summer becomes obvious when one bedroom stays chilly every night.
Systems we repair
San Gabriel has a wide range of housing ages, so the heating equipment varies just as much.
- Forced-air gas furnaces in attics, closets, garages and crawl spaces
- Wall furnaces and direct-vent wall heaters in older homes and apartments
- Floor furnaces with grates set into hallways
- Central heat pumps and ductless mini-split heat pumps
- Thermostats, including programmable and smart models
- Duct sections that leak, sag or have come loose in the attic
Safety comes before comfort
Every gas heating repair includes a look at the parts that keep combustion safe. We check the vent connector and flue for gaps or corrosion, confirm there is enough combustion air, look for gas leaks at accessible fittings, and inspect for signs of flame rollout or soot. If a carbon monoxide alarm has gone off, leave the home and contact the gas utility or emergency services before calling us.
If we find a hazard, we explain it and recommend keeping the appliance off until it is corrected. We would rather give you an honest answer than restart something that is not safe.
Details that speed up the diagnosis
A few notes from you can save real time once our technician is on site. Tell us the type of heater you have and roughly where it is located, since an attic furnace and a hallway floor unit need different access and tools. Mention whether the problem is constant or comes and goes, and whether it started after a power outage, a thermostat change or work on the house.
If the furnace has a small window on its front panel, the blinking light behind it is a fault code. Counting the flashes, or snapping a quick photo of the code chart on the door, gives us a head start. Noises are worth describing too: a squeal usually points toward the blower, while a click with no flame points toward ignition. None of this replaces testing, but it helps us bring the right parts on the first trip.
Spring and summer: the right time to plan
The quiet months are a good time to decide whether an old heater is worth keeping. If replacement is on the table, note that South Coast AQMD Rule 1111 limits emissions from new gas fan-type central furnaces in this region and is being amended toward zero-emission requirements, with dates the district sets and revises. Some homeowners use the opportunity to move to a heat pump, which also covers summer cooling.
Equipment rebates depend on which utility serves your address, and we confirm the current offer before quoting. Our heating repair service also covers Rosemead, San Marino, Alhambra, Temple City and South Pasadena.
More services in San Gabriel
- AC Repair in San Gabriel
- Heat Pump Installation in San Gabriel
- AC Installation in San Gabriel
- Furnace Repair in San Gabriel