Morrison · Repair

Furnace Repair in Morrison

At about 6,368 feet, with Bear Creek running through town and homes climbing the canyons beyond it, Morrison is hard on furnaces. Altitude, moisture and steep lots all play a part. We start every call with a carbon monoxide test and check that the furnace is set up for the elevation.

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All ZIPs80465

Altitude matters more here

Manufacturers require gas input to drop about 4 percent per 1,000 feet once a furnace is installed above 2,000 feet, and they specify a different pressure switch above 4,000 feet. At about 6,368 feet, that is a derate of roughly 25 percent, and homes up Turkey Creek Canyon or Mount Vernon Canyon sit higher still. A furnace installed without the right orifices and setup overfires, which overheats the heat exchanger, trips the high limit and can produce carbon monoxide.

We measure gas pressure and temperature rise on every Morrison call. If a furnace was bought or installed without a high-altitude conversion, we'll explain what it needs.

Morrison at a Glance

Elevation
6,368 ft
County
Jefferson County
Permits
Inside town limits: Town of Morrison, which contracts with Charles Abbott Associates for code enforcement (inspection requests by 4 p.m.…
Gas utility
Varies by address — check your bill
Electric utility
Varies by address — check your bill
Gas furnace output loss
≈25% vs. sea level (about 4% per 1,000 ft)
Housing
Town of 396 people (2020); Morrison Historic District listed on the National Register in 1976, with late-1800s sandstone buildings; ZIP 80465 covers about 5,000…

Facts checked November 2026. Sources listed below.

Morrison Climate Note

Downtown Morrison is about 6,368 feet, and homes up the canyons sit higher. Furnaces need a larger altitude derate than on the plains, and creek-side homes deal with basement moisture.

Neighborhoods We Serve

Downtown Morrison, Red Rocks Ranch, Willow Springs, Friendly Hills, Kerr Gulch, Mount Vernon Canyon, Turkey Creek Canyon

Historic buildings and creek-side moisture

The Morrison Historic District includes sandstone buildings from the late 1800s, and their heating systems were added long after construction. Tight basements, shared chimneys and limited combustion air are common, and we pay close attention to venting and draft in these buildings.

Homes along Bear Creek carry moisture and water-intrusion risk given the creek's flood history. Damp basements rust furnace burners, heat exchanger areas and cabinet bottoms, corrode flame sensors and wiring, and shorten the life of blower motors. If your furnace sits in a basement that has taken water, have it inspected before relying on it for the winter.

Foothill homes on steep lots

Many homes around Morrison are mid-century houses on steep canyon lots, often with furnaces in crawlspaces or lower-level utility rooms and long duct runs up to the main floor. Uneven heat between levels is common, and balancing dampers, blower speed and return air often matter more than furnace size. Snow and ice can also pile against side-wall PVC vents on newer furnaces and trip the pressure switch. If your home uses propane or a boiler rather than a natural gas furnace, let us know when you book.

What we do on a repair call

After the carbon monoxide and combustion safety check, we read fault codes and test the igniter, flame sensor, inducer, pressure switch, limit switches, blower and capacitor. We inspect the flue or PVC vent and the condensate drain, and look for rust and moisture damage. You get a flat-rate price before we start. The diagnostic is free when you approve the repair, and nights and weekends cost no more. Our trucks carry parts for Trane, Lennox, Carrier, Goodman, Bryant and Rheem.

Permits and replacement: town or county?

Inside town limits, the Town of Morrison contracts with Charles Abbott Associates for code enforcement, and inspections must be requested by 4 p.m. the business day before. Properties in the flood area may need to meet the town's floodplain permit checklist, which can affect where new equipment is placed. Most 80465 addresses are outside town, where Jefferson County Building Safety issues mechanical permits for furnaces, boilers and gas piping, including liquid propane.

We recommend repair for a single failed part on a sound furnace. A rusted-through heat exchanger, flood damage, or an older furnace that was never set up for altitude are good reasons to replace.

Furnace Repair in Morrison: Service Area Map

Orange shows the Morrison boundary; dashed lines are county borders (Jefferson County highlighted in white). Blue areas are other communities MrFixer serves — tap one to open its page.

Map of Morrison, Colorado city limits in Jefferson County with neighboring communitiesLakewoodMorrison1 miMrFixer service area
Boundaries: U.S. Census Bureau TIGER/Line (places, counties). Simplified for display; not a survey or service-territory map.

Furnace Repair FAQs — Morrison

Our Morrison basement flooded. Can we still run the furnace?

Don't run it until it's inspected. Water can damage the gas valve, controls, burners and blower motor. We'll check it and tell you what's safe to repair.

Is my home in town or county for permits?

Most 80465 addresses are in unincorporated Jefferson County. Only homes inside town limits go through the Town of Morrison. We confirm before filing.

Why does our furnace keep tripping the high limit?

At this elevation, a furnace that was never derated can overfire and overheat. Dirty filters and restricted ducts also cause it. We measure gas pressure and temperature rise to find out which.

Snow keeps blocking our furnace vent pipes. What can we do?

Clear them carefully after each storm. If drifting is a regular problem, the termination may need to be raised or relocated within the manufacturer's limits, which we can evaluate on a visit.

Do you work on furnaces in older stone buildings downtown?

Yes. We focus on venting, combustion air and carbon monoxide in those buildings, since their heating was added long after they were built.

Sources for this Morrison page (5) · checked November 2026
  1. en.wikipedia.org
  2. morrisonco.us
  3. inspectandtest.net
  4. jeffco.us
  5. manualslib.com

Signs You Need Furnace Repair

01

Furnace not igniting or blowing cold

03

Yellow flame instead of blue

02

Strange noises (rattling, banging, screeching)

04

Frequent cycling or short cycling

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