Your furnace doesn't get a break here
Winter nights in Clear Creek County average 12 degrees, and homes here run heat in every month of the year. Most furnaces in most places get to sit idle for a stretch. Yours doesn't.
Furnace Repair in Idaho Springs, CO
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That changes what a repair call means
A furnace running this many months, against cold this deep, wears its parts down faster than one running a normal winter schedule. The problem you're seeing now may be showing up earlier than it would somewhere milder.
- 12°F
- the average winter night it heats against
- 56%
- of homes here heat with gas, so most furnaces here burn gas
- 74 winter storms
- in ten years, the nights a failure hurts most
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NOAA nClimDiv, 1991–2020 normals
A cracked heat exchanger gets worse every hour the furnace keeps firing.
Shutting it down and calling for a repair now costs less than running it until it fails outright.
Gas here runs $10.09 per million Btu, and a furnace that's struggling burns more of it every month
A furnace that needs attention usually says so before it quits outright. The burner flame should burn steady and blue. If it's flickering yellow or orange, the furnace is telling you something about how it's burning gas, and that's worth a call regardless of anything else going on. Short cycling, where the furnace fires up, runs a few minutes, then shuts off before the house warms up, points to a flame sensor going bad or a filter choked with dust. A furnace that runs and runs without hitting the thermostat setting is losing heat somewhere it shouldn't, or the blower isn't moving enough air past the heat exchanger. Banging or scraping when it starts is a different problem, usually the blower wheel or motor bearings, and it won't fix itself by ignoring it. Any of these is worth a call. None of them mean the furnace is done, but all of them mean something inside it is working harder than it should.
Get the real cause found now, not guessed at
A furnace that runs every month of the year doesn't get the downtime to hide a problem. Whatever's causing yours to act up is only getting more hours put on it. Have it looked at and fixed properly so the repair holds.
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What to check before you call
Check the filter first. Pull it out and hold it up to a light. If you can't see light through it, it's choking the airflow and the furnace is working harder than it needs to. Next, look at the vents and returns in the house and make sure nothing is blocking them, furniture, boxes, rugs. Check the thermostat has fresh batteries if it takes them, and that it's set to heat and not just fan. Look at the furnace itself for a flashing light near the access panel. Most furnaces have a small window showing a blinking code, and the manual that came with it, or one found by the model number, will tell you what that code means. If the furnace won't start at all, check that the switch on or near the unit, the one that looks like a light switch, hasn't been bumped off. Check the breaker too. None of this fixes a cracked heat exchanger or a bad flame sensor, but it rules out the simple things before anyone comes out, and it tells the tech more about what's already been tried.
Most failures start with heat, not cold
A heat exchanger cracks from metal flexing as it heats up and cools down, over and over, cycle after cycle. Every start and stop is a small stress on the metal. The igniter wears the same way, a little more each time it glows hot and cools off. The parts most likely to fail are the ones doing this work every single cycle.
Airflow problems cause most of the rest
A dirty filter, a blocked return, or a duct that's come loose all starve the furnace of air it needs to move past the heat exchanger. Without enough air, the furnace runs hotter than it should, and that heat has nowhere to go. The blower motor works harder, the limit switch trips more often, and parts rated for normal airflow wear out ahead of schedule.
A new furnace would cut about $160 a year off heating for a typical Clear Creek County home.
Estimates for a typical Clear Creek 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.
At some point every furnace owner asks whether a repair is worth it or whether the money should go toward a new unit instead. Age matters more than any single symptom. A furnace in its first half of life is usually worth fixing almost regardless of what broke, since one repair rarely leads straight to the next. A furnace well past that point is a different question, especially if this isn't the first repair call. The heat exchanger is the one part that changes the math entirely. A cracked one means replacing the furnace, not patching it, because that part isn't sold or swapped on its own. Short of that, most repairs, a new igniter, a new blower motor, a new flame sensor, are worth making on a furnace that's otherwise sound. The question isn't just what broke. It's how many other parts are the same age and running the same hours.
