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Furnace Repair in Highlands Ranch, CO

Rated 4.7 out of 5
4.7 Google rating from 432 reviews

Furnace Repair in Highlands Ranch, CO

No heat? We find the cause and price it before we start.
  • HVAC diagnostic: $99.95
  • Price before any work starts
  • Written guarantees
Call (720) 870-1580
Request service
Mitsubishi Diamond Contractor
Lennox Premier Dealer
Lennox Centurion Award
NATE-certified technicians
Call Summit
(720) 870-1580
Rated 4.7 out of 5
4.7 Google rating from 432 reviews

Furnace Repair for Highlands Ranch Homes

Summit Heating, A/C, Plumbing & Electrical repairs gas furnaces for homeowners across Highlands Ranch. It’s for the house that’s cold with the thermostat calling for heat, or a furnace that starts and shuts off. Your technician finds the cause first, explains it, and gives you the price before any work starts, so you decide on the repair with the facts in front of you.

HVAC diagnostic: $99.95. Your technician reviews the estimate with you. You can approve it on the spot or later through a link to the estimate.

No-Heat Furnace Checklist Before You Call

Some no-heat calls are quick checks you can do first:
  • Is the thermostat set to heat, and set above room temperature?
  • Is the furnace switch on, and is the breaker on?
  • Is the filter clogged? A blocked filter can make the furnace shut itself off.
  • Is the furnace access panel closed? Many furnaces won’t run with it off.
If none of that helps, call us. If you smell gas, leave the house and call 911 or your gas utility from outside.

Gas Furnace Problems We Repair

Furnace runs but blows cold air

Ignition or flame sensor problems, gas supply, a tripped limit

Furnace starts, then shuts off

Dirty flame sensor, overheating, airflow problems

No sign of life

Power, a failed control board, the door switch

Loud bangs, squeals or rattles

Delayed ignition, blower motor or belt wear

Some rooms much colder than others

Airflow, the blower or the thermostat

How a Furnace Repair Visit Works

  1. Call (720) 870-1580 or request service online.
  2. Your technician tests the furnace and finds the fault.
  3. Your technician explains it and reviews the estimate with you.
  4. Approve the repair on the spot or later from the link.
  5. We make the repair, run a full heating cycle and clean up.

Furnace Repair Hours and After-Hours Calls

We’re open Monday to Friday 7am to 6pm and Saturday and Sunday 8am to 3pm. After hours: our answering service takes your call and we call back the next business day. We don’t advertise hours we can’t staff.

Heating does most of the work here. Denver-area normals show about 5,863 heating degree days a year and a January average low of 18.7°F (NOAA 1991-2020, Denver International Airport), so we treat a no-heat call in January as a priority within our hours.

Furnace Repair First, Replacement Only When It Makes Sense

We price the repair first. Colorado’s low-NOx rule covers new gas furnaces sold since Jan 1, 2026, and repairs of existing furnaces are not affected. If a repair doesn’t add up on an older furnace, see furnace replacement in Highlands Ranch.

When Furnace Work Needs a Douglas County Permit

Highlands Ranch is unincorporated Douglas County. The Douglas County Building Division’s mechanical permit covers the replacement or addition of a furnace, filed online through the county’s e-permits system. The county has worked under the 2024 International codes since July 1, 2026. Your technician tells you if a repair crosses into permitted work. (Douglas County, checked Nov 2026.)

Our Written Guarantees on Every Furnace Repair

We Stand Behind Our Work

If a repair or installation issue is caused by our workmanship, we will return and make it right at no additional charge within the applicable warranty period.

Honest Recommendations

We will explain our findings, provide honest recommendations, and never pressure you into purchasing services or equipment you don't need.

Respect for Your Home

Our technicians will treat your home with care, maintain a clean work area, and conduct themselves professionally.

Your Satisfaction Matters

If you are unhappy with your service experience, give us the opportunity to address your concerns. We will listen, investigate, and work toward a fair resolution.

We Take Responsibility

If we make a mistake, we own it. We believe in accountability and doing what is right for our customers.

Google Reviews of Summit Heating, A/C, Plumbing & Electrical

Summit holds a 4.7 rating from 432 Google reviews.

"Our first encounter was a heating issue - they were able to apply a simple fix, and recommended a new thermostat."

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Furnace Repair Questions from Highlands Ranch Homeowners

The HVAC diagnostic is $99.95. Your technician finds the fault and reviews the repair price with you before any work starts.
No. The HVAC diagnostic is a flat $99.95. You see the repair price separately and decide before any work starts.
Our hours are Monday to Friday 7am to 6pm and Saturday and Sunday 8am to 3pm. After hours, our answering service takes your call and we call back the next business day.
Common causes are a dirty flame sensor, overheating from a clogged filter or poor airflow, or an ignition problem. Your technician tests it to find which one before quoting a fix.
No. The rule covers new gas furnaces sold in Colorado since Jan 1, 2026. Repairs of existing furnaces are not affected.
Douglas County’s mechanical permit covers replacing or adding a furnace. Your technician tells you if your repair crosses into permitted work, and we pull the permit when it does.

Schedule Furnace Repair in Highlands Ranch

Call (720) 870-1580 to book a HVAC diagnostic, or request service at /get-a-quote/.
Call (720) 870-1580
Request service