Heating & Furnace Repair in Phoenix Metro, AZ

Heating equipment in the Phoenix area lives an odd life. It sits idle for most of the year, collecting dust, and then it is expected to fire up perfectly on the first chilly night. Most heating problems here trace back to that long idle stretch, not to hard use.

Absolute Air AZ repairs gas furnaces, heat pumps in heating mode, electric heat strips and rooftop gas-electric package units. You get upfront, flat-rate pricing before any work begins. Our office is open Monday to Friday, 9:00 AM to 5:00 PM, with emergency service available outside those hours.

Signs your heating system needs repair

• The thermostat calls for heat and nothing happens
• The furnace lights, runs briefly, then shuts off
• The blower runs but the air stays cool
• A burning smell that lasts beyond the first hour or so of the season
• Banging, rumbling or squealing at startup
• A burner flame that is yellow or flickering and not a steady blue
• The breaker trips when the heat comes on
• Your winter electric bill jumps without a change in habits

How Phoenix-area homes are heated

There are three common setups in the Valley. The most widespread is the heat pump, which heats by running the air conditioning cycle in reverse. Many heat pump homes also have electric heat strips in the air handler as a backup.

Homes with natural gas service often pair an air conditioner with a gas furnace, usually in the attic, a garage closet or an indoor closet. The furnace and the AC share the same blower and ductwork.

The third is the rooftop package unit, common on flat-roof homes. Some are heat pumps. Others are gas-electric units, sometimes called gas packs, which hold a small furnace and an air conditioner in one cabinet. Knowing which system you have helps us show up prepared.

What a long off-season does to a furnace

Dust is the main culprit. Over the summer, fine desert dust settles on burners, flame sensors and heat exchanger surfaces. On the first heat cycle it burns off, which is the familiar hot, dusty smell that fades within an hour or so. Dust left on the flame sensor is more stubborn. The sensor cannot confirm the flame, so the furnace lights and then shuts itself down within seconds.

Attic furnaces also sit through months of extreme heat, which is hard on control boards, wiring insulation and rubber parts. Igniters grow brittle with age and can crack on the first call for heat. Insects and spiders build nests in burner orifices and in the small tubing connected to pressure switches while the unit sits unused.

Common gas furnace repairs

Modern furnaces run through a safety sequence every time they start. The inducer fan clears the heat exchanger, a pressure switch proves the vent is open, the igniter heats, the gas valve opens and the flame sensor confirms ignition. A failure at any step stops the furnace, and the control board usually flashes a code that points us toward the cause.

That means most no-heat calls come down to a short list of parts.

The limit switch deserves a special mention. It shuts the burners off when the furnace overheats, and the most common reason is restricted airflow from a filter that was never changed after summer. Look at your filter before you call. It may save you a visit.

• Dirty or failed flame sensor
• Cracked hot surface igniter
• Stuck or blocked pressure switch
• Worn inducer or blower motor
• High limit switch tripped by a clogged filter
• Failed control board or thermostat wiring fault

Gas safety and carbon monoxide

A gas furnace is safe when it burns cleanly and vents properly. The heat exchanger keeps combustion gases separate from the air that blows into your rooms. If it cracks or rusts through, or if the vent pipe is blocked or disconnected, those gases can end up where they should not be.

Every home with a gas appliance or an attached garage should have working carbon monoxide alarms. If an alarm sounds, get everyone outside and call 911 or your gas utility from there. If you smell gas, leave the house first and do not use light switches or phones inside.

During a heating repair we inspect the burners, the flame, the venting and the visible heat exchanger surfaces. If we find something unsafe, we show it to you and explain your options plainly.

Heat pumps and electric heat in winter

If your home is all-electric, your heater is your air conditioner running backward. Heating failures on these systems often involve the reversing valve, the defrost control, an outdoor fan motor or a refrigerant leak that went unnoticed in summer.

Electric heat strips have their own failure points: burned sequencers or relays, tripped thermal limits and broken elements. A system that heats only when set to emergency heat, or one that heats but sends your winter electric bill soaring, is telling you something is wrong on the heat pump side.

Before the first cold snap, switch the thermostat to heat on a mild afternoon and let it run for a few minutes. Finding a problem in November is far easier than finding it on the coldest night of the year.