Furnace Repair

Common signs include a furnace that will not start, blows cold air, makes unusual noises (banging, squealing, rattling), cycles on and off frequently, produces inconsistent heat, or struggles to maintain your thermostat setting. A yellow or orange burner flame — which should be blue — is a safety concern that warrants immediate professional evaluation.

Furnace repair costs vary depending on the problem, equipment, parts required, and complexity of the repair. Common repairs: ignitor replacement $150–350, flame sensor $80–200, blower motor $300–600, control board $200–600. A heat exchanger problem may make replacement more cost-effective. We diagnose the problem and provide upfront pricing before any work begins.

Yes. A furnace blowing cold air usually has a specific, diagnosable cause — dirty or failed flame sensor, failed ignitor, clogged filter causing a safety shutoff, or the thermostat set to fan-only instead of heat. A professional inspection identifies which component is responsible.

Yes. Zenith Home Services provides 24/7 emergency heating service throughout Colorado's Front Range. A furnace failure in winter — especially overnight or on the coldest days — can't always wait until morning. Call (720) 255-9702 any time.

It depends on the furnace's age, condition, the nature of the repair, and cost. A furnace under 15 years old with a specific failed component is usually worth repairing. A furnace over 15–18 years old with recurring problems, a cracked heat exchanger, or repair costs exceeding 50% of replacement cost may be better replaced. We provide an honest recommendation after evaluating your specific system.

Once a year, before the heating season — typically in fall. Annual maintenance catches developing problems like a dirty flame sensor, worn ignitor, or cracked heat exchanger before they cause a breakdown on the coldest night of the year. Colorado's hard winters make pre-season service especially valuable.

Yes. We diagnose and repair gas furnaces — including ignition problems, flame sensor issues, heat exchanger concerns, gas valve problems, and blower failures — throughout Colorado's Front Range.

Yes. We service electric furnaces — including heating element failures, sequencer problems, limit switch issues, and blower motor repairs — throughout Colorado.

We serve communities throughout Colorado's Front Range including Denver, Aurora, Lakewood, Arvada, Westminster, Thornton, Northglenn, Brighton, Commerce City, Boulder, Longmont, Louisville, Lafayette, Fort Collins, Loveland, Greeley, Castle Rock, Parker, Highlands Ranch, Centennial, Englewood, Littleton, Lone Tree, Colorado Springs, and many more. See our full service area at zenithhomesservices.com/service-areas.

First: check that your thermostat is set to HEAT and above the current room temperature. Confirm the power switch near the furnace is on and the circuit breaker hasn't tripped. Check whether the furnace has an error code displayed. If the furnace still won't operate, call a heating technician. If you smell gas or suspect a gas leak, leave the building immediately and call your gas utility or 911 from a safe location.