Colorado Heating Pros
A gas furnace and sheet-metal air handler unit installed in an unfinished concrete basement.

Furnace Repair in Aurora, CO

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Step 1 of 3: Equipment

Arapahoe County sees real storm damage

Arapahoe County logged 360 severe weather events between 2015 and 2024. That includes 175 hail events, 97 damaging wind events, and 8 tornadoes. A furnace itself sits indoors, but the system around it doesn't.

Outages hit gas furnaces too

A gas furnace still needs electricity to run the blower and controls. Statewide, 13% of Colorado households lost power for 24 hours or more in 2024. When the power drops in a hard winter, the furnace stops with it until service comes back.

8 months
October through May, your furnace is on duty
16°F
the average winter night it heats against
65%
of homes here heat with gas, so most furnaces here burn gas
78 winter storms
in ten years, the nights a failure hurts most
Isometric cutaway illustration of a single-story house with a dark shingled roof, showing interior rooms with beds and furniture, overhead ductwork, and a gray furnace with a tall flue pipe at the exterior wall.
Your furnace works hardest from November through April.

NOAA nClimDiv, 1991–2020 normals

Furnaces in Arapahoe County run about eight months a year, October through May.

A furnace that runs nearly all year has less time to rest and more time to wear.

Half the homes here were built in 1986 or later, so a lot of furnaces still have years left in them

Half the homes here were built by 1986
Climate zone 5B
Heat runs October through May

October is when heat gets switched on for the season, and that first run is a kind of test. A furnace that sat idle since spring will show a weak igniter or a failing flame sensor as soon as it has to carry a full load. Here that test comes with no slack built in. Overnight lows average 16°F in the hardest part of winter, so a furnace that struggles in October is one you're relying on by December. Get a furnace looked at before the season starts, or at the first sign of trouble once it does, rather than waiting to see if the problem works itself out.

If this winter's storms hit your furnace system, get it checked before you need it

A furnace blower depends on power that storms here take out. If a recent storm knocked your power out or you saw hail or wind damage outside, have the furnace checked even if it's still running. A problem shaken loose now is easier to deal with before the cold settles in for good.

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A gray residential gas furnace installed in an unfinished basement, surrounded by ductwork, a metal flue pipe, and a gas supply line.

Eight months of runtime, dozens of storms behind it

Eight months of heat is most of the year this furnace gets to prove itself. Arapahoe County saw 78 winter storms between 2015 and 2024, and every one of those asked the furnace to keep cycling through weather it can't afford to fail in. That kind of steady demand is what pushes an igniter or a flame sensor toward the end of its life sooner than it would somewhere milder. If your furnace is slow to light, cycling more than it used to, or running louder, get it checked now rather than mid storm.

A cracked heat exchanger gets worse under heat

A heat exchanger that's starting to crack stays small as long as it's cool. Every time the burners fire, the metal heats up and expands, and the crack opens a little further. Run the furnace on a hairline crack long enough and it turns into one that leaks exhaust into the air the blower is pushing through the house.

A dirty flame sensor doesn't fix itself

A flame sensor coated with a thin layer of oxidation starts telling the control board the flame went out even when it didn't. Keep cycling the furnace and the board keeps shutting the gas valve off as a safety response, which looks like short cycling or no heat at all. The coating doesn't wear away on its own. It needs to be cleaned off before the furnace will hold a flame through a normal cycle.

An unfinished basement containing a forced-air furnace with metal ductwork, exposed wooden ceiling joists, a hanging Edison bulb, and bare concrete floors.

A new furnace would cut about $100 a year off heating for a typical Arapahoe County home.

  • A new high-efficiency furnace$400 a year
  • An older furnace$500 a year

Estimates for a typical Arapahoe County home, compared with an older unit built to the previous federal minimum, from EIA household energy data, Colorado fuel prices and NOAA climate normals. Your home will differ.

Repair makes sense when one part has failed and the heat exchanger is sound.

Replacement makes sense when the heat exchanger is cracked or the furnace keeps needing parts.

A diagnostic call starts with the thermostat and works back from there. The tech checks what the furnace is doing, or not doing, before opening anything up: does the blower run, does the burner light, does it shut off early or not fire at all. From there it's the igniter, the flame sensor, the pressure switch, the control board, checked in the order that matches what the furnace is telling them. A furnace that tries to light and fails leaves clues a furnace that never tries doesn't. Once the bad part is found, a good tech shows it to you rather than just naming it, and explains why that part causes the symptom you called about. The visit ends with a straight answer: what failed, what it takes to fix it, and whether anything else is close behind it.