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ShadelineAirHeating & cooling · Phoenix
A cold, clear desert winter morning: a low pale sun over blue mountain ridges, frost on the ground and a heat pump letting off a puff of steam

Outside, January dawn37°F

Thermostat dial set to heat the house to 70 degrees FahrenheitHEATING TO70°FInside

Heating

Heating and heat pump repair in Phoenix

Desert winters are mild until they are not. On the handful of mornings that dip into the 30s, a heat pump that has quietly lost its backup heat, or a furnace that has not run since March, lets you know. We repair both, and check gas furnaces for carbon monoxide every time.

Heat pumps

Most Phoenix homes heat with the same unit that cools them

A heat pump runs in reverse in winter, pulling heat from outdoor air. On cold mornings it leans on a backup electric heater, and every so often it defrosts the outdoor coil, which can send up a puff of steam. That is normal. These are not:

  • Lukewarm air from the vents while the outdoor unit runs.
  • The outdoor coil stays covered in ice and never clears.
  • Power bills jump because the backup heat runs all day.
  • It cools fine in summer but will not switch to heat.

Gas furnaces

Older homes, and the yearly safety check

Many older homes in central Phoenix, Tempe and Mesa still have a gas furnace with a separate air conditioner. A furnace that sits idle for nine months needs a look before the first cold night: burners, flame sensor, ignition, venting and the heat exchanger.

Smell gas?

Do not switch anything on or off. Leave the house, then call your gas company or 911 from outside. When they say it is safe, call us. See the full safety steps.

Heating diagnostic visit
from$79
Furnace safety check with CO test
from$119
Flame sensor clean or ignitor
from$165
Heat pump defrost control repair
from$289

Sample prices for this demo website.

While you wait

Three checks before you call

Thermostat

Set it to Heat, raise it a few degrees above room temperature and check the batteries if the screen is blank.

Filter

A clogged filter can make a furnace overheat and shut itself off. Replace it if you cannot see light through it.

Breaker and switch

Check the breaker and the service switch near the furnace. Reset a tripped breaker once, never repeatedly.

Heating questions

Heating and heat pump FAQs

Why is steam coming off my heat pump on a cold morning?

That is usually the defrost cycle melting frost off the outdoor coil, and it is normal. If the unit is covered in thick ice or the defrost never ends, call us.

Should I use the emergency heat setting?

Only if the outdoor unit has failed. Emergency heat runs the electric backup heater on its own, which keeps the house warm but costs much more to run. Call us so we can repair the heat pump.

How often does a gas furnace need a safety check?

Once a year, before the first cold spell. We test the burners, flame sensor and venting, check the heat exchanger for cracks and test for carbon monoxide.

Add a fall tune-up with a plan AC repair and replacement

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