Every install we quote includes the full scope below. No hidden add-ons for things that should be standard. If your job needs something outside this list, like new ductwork or a chimney liner, we price it upfront and show you why it is needed.
The furnace itself, plus the thermostat, gas connector, flue or PVC venting materials, condensate trap and neutralizer for high-efficiency units, duct sealant, and a fresh air filter. We use mastic and foil tape on every joint, not just screws and hope. Brands include Lennox, Carrier, Trane, Goodman, Rheem, York, Bryant, American Standard, Amana, and Coleman.
We pull the mechanical permit from your city or county, schedule the inspection, and meet the inspector on site. If they flag anything, we correct it and get it re-inspected at no charge. You get the signed-off permit card, which matters when you sell the house.
New gas line sized to the furnace input, pressure-tested with a manometer, and connected with a code-approved connector. Electrical disconnect, dedicated circuit verification with a clamp meter, and low-voltage thermostat wiring. We check the breaker and wire gauge before we energize anything.
We clock the gas meter to verify input BTU, set the air-fuel mixture with a combustion analyzer, and check temperature rise against the data plate. Blower speed is set to your duct system based on static pressure readings. You get the commissioning numbers in writing.
The old furnace, old flue materials, and all packaging leave with us. We vacuum the mechanical room, wipe down the cabinet, and put your tools and stored items back where they were. You should not be able to tell we were there except for the new equipment.
Manufacturer parts warranty registered within 5 business days, confirmation emailed to you. Our labor warranty covers the installation for 2 years. We keep your commissioning sheet and permit number on file so future service calls start with full history.
Furnace Installation in Colorado is the full removal and replacement of your home's primary heat source, including the equipment, gas piping, flue or PVC venting, electrical connections, thermostat, and commissioning. It is not a swap-and-go. We measure static pressure, check the heat exchanger on the old unit, verify the plenum and duct sizing, and confirm your gas meter and shutoff can feed the new BTU load. If the ductwork is undersized for the furnace you want, we tell you before we order anything.
Most Colorado homes we walk into are running a 20-year-old builder-grade unit that was never sized for the finished basement or the addition out back. That is why the cost to install a new furnace in Colorado varies so much from house to house. We see 80,000 BTU furnaces trying to heat 2,400 square feet in Boulder, and we see oversized 120,000 BTU units short cycling in a 1,300 square foot ranch in Eaton. Both are wrong, and both cost you money every month.
Five steps, no surprises. Here is exactly what happens from the first phone call to the first cold morning you wake up warm.
Schedule
Call or book online — a real human picks up and confirms a 2-hour arrival window.
Diagnose
Licensed tech inspects on-site, then walks you through the cause and your options.
Fix
The job is completed to code and done right the first time — no shortcuts, no surprises.
Guarantee
Every job backed by a written workmanship warranty — and we stand behind it.
Combustion analyzer
Measures oxygen, carbon monoxide, and flue temperature so we can set the air-fuel mixture correctly. Every gas furnace we install gets tuned with one before we leave. It is how we catch a bad gas valve or a blocked flue on day one.
Manometer
Reads gas pressure at the valve and static pressure in the ductwork. We use it to verify inlet pressure, manifold pressure, and total external static pressure. If static pressure is over 0.8 inches of water column, the duct system needs work.
Clamp meter and multimeter
Test amp draw on the blower motor, verify the igniter and flame sensor circuits, and check the control board. A clamp meter tells us in 30 seconds whether a blower motor is failing or the capacitor is weak.
Inspection camera
Lets us look inside the heat exchanger and the plenum without cutting open ductwork. We use it on every pre-install inspection to confirm whether the old unit is safe and whether the duct interior has rust or debris.
Vacuum gauge
Used during refrigerant recovery and evacuation when we swap an AC coil alongside the furnace. Pulling a proper vacuum to 500 microns is the difference between a coil that lasts 15 years and one that leaks in three.
Nest and Honeywell thermostats
The two brands we install most. Nest for homeowners who want scheduling and remote control, Honeywell for straightforward programmable reliability. Both are wired and configured during the install, not left for you to set up.
ACCA Manual J load calculation
The industry standard for sizing heating equipment. We measure square footage, insulation R-values, window area and orientation, duct leakage, and design temperature for your elevation. The result is a BTU number that holds up to inspection and to real-world performance. No guessing from square footage.
ACCA Manual D duct design
When ductwork needs modification, we design it to Manual D so the new furnace gets the airflow it needs. That means sizing trunks and branches to the blower's rated CFM and keeping static pressure in range. It is the step most installers skip, and it is why so many new furnaces underperform.
High-altitude derating
Above 2,000 feet, gas furnaces need smaller orifices or a derate kit to burn cleanly. At 9,000 feet in Fairplay or Leadville, that is roughly a 36 percent reduction in input. We install the correct kit and verify with a combustion analyzer so the unit is not over-firing and sooting up.
Combustion analysis and temperature rise verification
After the install, we clock the gas meter to confirm input BTU, measure flue CO and CO2, and check temperature rise against the data plate. If temperature rise is outside the range, we adjust blower speed. This is the commissioning step that separates a real install from a box swap.
Permit and inspection coordination
We pull the mechanical permit, schedule the rough and final inspections, and meet the inspector on site. Colorado jurisdictions vary on what they want to see, from flue slope to condensate neutralizer to combustion air. We know the local requirements and build to them the first time.
01
What we do: We inspect the heat exchanger, blower motor, inducer, and control board, then compare the cost of the next repair against a new install over a five-year window. Most of the time, the math favors replacement, and we show you the numbers instead of just saying so.
→ You get a new furnace with a 10-year parts warranty, lower gas bills, and no more guessing whether it will fire on the coldest night of the year.
02
What we do: We quote the install before closing so you can negotiate it into the sale. We pull the permit, install the new unit, and hand you the commissioning sheet and warranty registration. If the seller is paying, we work directly with the title company.
→ You move into a house with heat you can trust and a paper trail that satisfies your lender and your insurance carrier.
03
What we do: We run a new Manual J calculation on the expanded square footage, check whether the duct system can handle the added load, and either upsize the furnace or add a zone. If the ducts are undersized, we quote duct modifications alongside the equipment.
→ The new space heats like the rest of the house, and the original rooms do not get cold because the furnace is now fighting a load it was never sized for.
04
What we do: We coordinate with your gas utility on the meter upgrade, run the new gas line, install the furnace and venting, and remove the old baseboard or propane tank. This is a bigger job than a straight swap, so we schedule it as a two-day install.
→ You get gas heat at a fraction of the cost of baseboard electric or propane, plus central air conditioning capability if you add a coil.
Colorado is not one climate. The Front Range swings from 65 degrees in November to minus 10 in a January cold snap, and mountain towns like Fairplay and Leadville see design temperatures near minus 15. That range drives equipment selection: a single-stage 80% furnace that works fine in Wheat Ridge will struggle to keep up at 9,900 feet without a derate kit and a properly sized unit. Building stock varies too. Boulder and Lafayette have a lot of 1920s bungalows with undersized gravity-era ductwork, while Timnath and Eaton are full of newer construction with tight envelopes and right-sized trunks. We adjust the load calculation and the duct approach for each. Permits run through city and county building departments, and most Front Range jurisdictions want a final inspection on a furnace swap. If you are pricing a new furnace installation Colorado-wide, plan on $3,800 to $8,500 in 2026 depending on equipment tier and venting scope. We quote it flat after the assessment.
Boulder
Older bungalows near Chautauqua and Mapleton Hill often have original gravity ductwork that needs modification before a modern furnace will perform. We scope that during the assessment.
Wheat Ridge
Mid-century ranches with basement furnaces and short flue runs. Most swaps here are straightforward one-day installs with standard PVC venting through the rim joist.
Lafayette
Mix of older downtown homes and newer builds near the coal creek corridor. Duct sizing varies widely, so we always measure static pressure before quoting equipment.
Fairplay
High-altitude installs at 9,900 feet. Every furnace here needs a derate kit and combustion analysis. We stock the orifice kits on the truck so we do not have to order and wait.
Canon City
Warmer Arkansas River valley climate with milder design temperatures. Smaller BTU furnaces work here, and we often pair the install with a heat pump for shoulder-season efficiency.
High-altitude derating above 2,000 feet
Furnaces must be derated roughly 4 percent per 1,000 feet of elevation. At 9,000 feet, that is a 36 percent reduction in input. We install the correct orifice kit and verify with a combustion analyzer so the unit burns clean and does not soot up the heat exchanger.
Dry air and static electricity
Colorado's low humidity means more static, which can damage control boards and flame sensors over time. We ground the cabinet properly and use a surge protector on the furnace circuit. It is a small step that saves a $600 board replacement.
Wide temperature swings from October to April
A 60-degree day followed by a 10-degree night forces the furnace to modulate constantly. Two-stage and variable-speed units handle that far better than single-stage. We default to two-stage on most Colorado installs for that reason.
Frozen condensate lines on high-efficiency units
A 96% furnace makes water that has to drain outside or to a neutralizer. If the line runs through an unheated space, it freezes and shuts the furnace down. We route condensate to interior drains whenever possible and insulate exterior runs.
Most of the calls we run are the same handful of failures. Here is what they look like, what they cost you if you wait, and how a proper install ends them.
Problem
A failed igniter, dirty flame sensor, or stuck gas valve leaves you with a blower pushing 65-degree air through the house. Pipes freeze, and a $300 repair turns into a $4,000 water damage claim if you wait.
Our Fix
We diagnose with a multimeter and manometer, then decide repair versus replacement based on the unit's age and heat exchanger condition. If it is 18 years or older, a new install is usually cheaper over the next five winters than three more repairs.
Problem
An oversized furnace hits the limit switch, shuts down, cools off, and fires again. That cycling wears out the heat exchanger, the control board, and the blower motor, and it burns 15 to 20 percent more gas than a correctly sized unit.
Our Fix
We run a Manual J load calculation and measure static pressure. Usually the old unit was oversized from day one. We install the right BTU rating with a two-stage or modulating burner so it runs long and low instead of short and hot.
Problem
A cracked heat exchanger can leak carbon monoxide into your supply air. It is a red-tag situation. You cannot safely run the furnace, and no reputable tech will repair a cracked exchanger on an old unit because the repair costs more than the furnace is worth.
Our Fix
We red-tag the unit, shut the gas off, and quote a replacement. Most swaps are done in one day. We also install a low-level CO monitor as part of the commissioning so you have a second set of eyes on the system.
Problem
Usually a failing blower motor, a shorted capacitor, or a bad control board. It gets worse in cold weather when the motor works hardest. You end up resetting the breaker at 4 a.m. and hoping it holds.
Our Fix
We test the motor windings with a clamp meter, check the capacitor, and inspect the control board for burn marks. If the furnace is otherwise sound, we replace the failed component. If the unit is on its last legs, we quote a new install with the same-day heat guarantee.
A new furnace is not a luxury purchase. In Colorado it is the difference between a $90 gas bill and a $220 one, and between a warm house in January and a service call at 2 a.m.
Lower monthly gas bills
A modern 96% AFUE two-stage furnace burns roughly 15 to 25 percent less gas than the 80% unit it replaces. On a typical Front Range winter, that is $300 to $600 back in your pocket between October and April. We set the dip switches and airflow so the unit actually runs in low stage most of the time, which is where the savings live.
Heat that reaches every room
Cold bedrooms over the garage and frozen bathrooms on the north side are almost always a duct and static pressure problem, not a furnace problem. During new furnace installation Colorado crews measure total external static pressure and set blower speed to the duct system. Get that right and the far rooms finally catch up.
Fewer mid-winter breakdowns
A furnace that trips the breaker, short cycles, or blows cold air is telling you the heat exchanger, gas valve, or control board is on its way out. Replacing it on your schedule in September costs far less than an emergency swap in a blizzard. We also register the manufacturer warranty the same week we install.
Safe, code-correct venting
Colorado inspectors look hard at flue slope, combustion air, and condensate disposal on high-efficiency units. A 90%+ furnace makes acidic water that has to drain and neutralize correctly, and the PVC intake and exhaust have to be pitched and terminated per code. We build it to pass the first inspection.
Typical 2026 pricing for a residential furnace install in Colorado runs $3,800 to $8,500, with the average around $5,400. That range covers equipment, labor, permit, venting, thermostat, commissioning, and haul-away. A basic 80% single-stage swap in a ranch home sits at the low end. A 96% two-stage variable-speed unit with new PVC venting, a smart thermostat, and duct modifications pushes toward the top. We quote flat after the in-home assessment, and the number on the quote is the number on the invoice.
Typical Investment Range
$3,800 - $8,500 depending on equipment tier, venting scope, and ductwork condition
A new furnace lasts 15 to 20 years. Spread over that life, the difference between a cheap install and a correct one is a few dollars a month, and the correct one saves you 15 to 25 percent on gas the whole time. We quote flat, pull the permit, and register the warranty.
What changes the price
Equipment tier and efficiency
An 80% single-stage furnace costs $1,200 to $1,800 less than a 96% two-stage variable-speed unit. The high-efficiency unit saves 15 to 25 percent on gas and qualifies for utility rebates in some Colorado service territories. We show you the payback math before you decide.
Venting scope
If your old furnace used a metal flue and the new one is 90%+ efficiency, we have to run PVC intake and exhaust, which adds 3 to 6 hours of labor and materials. If the flue can be reused, the install is faster and cheaper. We scope this during the assessment.
Ductwork condition
Crushed returns, undersized trunks, and disconnected branches are common in older Colorado homes. Fixing them adds $400 to $2,000 depending on scope. Skipping them means the new furnace runs at higher static pressure and never hits its rated efficiency.
Altitude and location
High-altitude derate kits add $150 to $350 in parts and setup. Attic and crawlspace installs take longer than basement swaps and add labor. Long flue runs through finished walls add time and materials.
Thermostat and controls
A basic programmable Honeywell adds nothing. A Nest or a communicating thermostat with the manufacturer's proprietary controls adds $200 to $600. We wire and configure it during the install so you are not reading a manual on day one.
Permit and inspection fees
Colorado mechanical permit fees run $75 to $250 depending on the jurisdiction. We include the fee in the quote and handle the paperwork and inspection. Some cities require a separate gas permit, which we also pull.
Google ★★★★★4.9
Quoted three companies for a furnace replacement in Boulder. Furnace Pros was the only one that ran a load calculation and measured static pressure. Installed an 80,000 BTU Trane two-stage, fixed a crushed return duct, and the upstairs is finally warm. Gas bill down $77 a month.
Google ★★★★★4.8
Called on a Sunday with no heat in Fairplay. They had a tech out Monday morning, confirmed the heat exchanger was cracked, and had a new high-efficiency Rheem installed by Tuesday with the correct altitude kit. Straight answers, no upselling, flat price.
BBB ★★★★★4.9
Furnace died in Eaton in January with a newborn in the house. They set up temporary heat the same night and installed a new Goodman the next day. Permit pulled, inspection passed, warranty registered. Exactly what they promised.
Yelp ★★★★★4.7
Had a 22-year-old Carrier that was short cycling. Instead of just selling me a new furnace, they showed me the static pressure readings and explained why the old one was oversized. New two-stage unit runs long and low and the house is more even. Honest crew.
Our technicians hold NATE certification and EPA Section 608 credentials, and every install is performed under a Colorado HVAC license with OSHA safety compliance on the job site. We follow ACCA standards for load calculation and duct design, which is why our sizing holds up when the inspector asks how we got there. We work on Lennox, Carrier, Trane, Goodman, Rheem, York, Bryant, American Standard, Amana, and Coleman equipment, and we are honest about which one fits your budget and your house. If a Goodman gets you the same heat for $2,000 less, we will tell you.
We run furnace installs across the Front Range, the foothills, the Western Slope, and the San Luis Valley. Same load-calculation standard, same permit handling, same commissioning process whether you are in Boulder or Ophir. If you are searching for a furnace installation near me in Colorado Springs or a crew that will drive to Merino, we cover it.
Foothills installs at 8,500 feet with high-altitude derate kits and wood-stove-to-furnace conversions. We handle Boulder County permits and know the local inspection requirements.
Park County mountain homes with long propane or natural gas runs. We size for the elevation and route PVC venting through exterior walls where interior chases are not available.
Older bungalows and mid-century homes with gravity-era ductwork. We measure static pressure and often quote duct modifications alongside the new furnace to get even heat.
Warmer Arkansas River valley climate means smaller BTU furnaces and more heat pump pairings. We handle Fremont County permits and coordinate with local gas utilities.
Rural Pueblo County properties with propane and natural gas mixes. We install derate kits for the elevation and run combustion analysis on every commissioning.
San Luis Valley installs at 7,900 feet. Cold design temperatures and dry air mean two-stage equipment and proper grounding. We pull Rio Grande County permits.
Newer Weld County construction with tight envelopes and right-sized trunks. Most swaps here are one-day installs with standard PVC venting and a smart thermostat.
High-altitude installs at 9,900 feet. Every furnace gets a derate kit and combustion analysis. We stock orifice kits on the truck so we do not have to wait on parts.
Weld County rural properties with a mix of propane and natural gas. We size for the elevation and coordinate with the local gas cooperative on meter upgrades.
Teller County mountain homes with steep driveways and tight mechanical closets. We plan equipment access and venting routes during the assessment.
Jefferson County foothills properties with a mix of older and newer construction. We measure static pressure and check duct condition before quoting equipment.
Mix of older downtown homes and newer builds. Duct sizing varies widely, so we always measure static pressure and run a Manual J before picking a BTU rating.
Douglas County rural properties with well water and propane systems. We handle the gas line sizing and coordinate with the local propane supplier on tank and regulator setup.
Logan County installs on the eastern plains. Cold winter design temperatures and older housing stock mean we pay close attention to insulation and duct leakage.
San Miguel County high-country homes at 9,700 feet. Derate kits, combustion analysis, and condensate freeze protection are standard on every install we do here.
Real answers to the questions we hear most often from local homeowners and property managers.
If your current furnace is blowing cold air, short cycling, or tripping the breaker, repair is often the smarter call than replacement. We diagnose with a multimeter, manometer, and combustion analyzer, then tell you honestly whether a $400 fix buys you five more years or whether you are throwing money at a dying unit.
View Furnace RepairFurnace replacement is the same job as installation when the old unit is past its service life. We handle removal, disposal, new gas connections, venting, and commissioning. If your heat exchanger is cracked or your unit is 18 years or older, replacement is usually the right answer, and we will show you why.
View Furnace ReplacementA tune-up every fall keeps a new furnace running at its rated efficiency. We clean the flame sensor and igniter, check gas pressure with a manometer, verify temperature rise, and swap the air filter. On a freshly installed unit, the first-year tune-up catches anything that settled during the break-in period.
View Furnace Tune-UpAnnual maintenance protects the manufacturer warranty and keeps your heat exchanger under warranty. We inspect the blower motor, capacitor, control board, and inducer, and we log static pressure each year so we can spot duct problems before they stress the equipment. It is the cheapest insurance you can buy for a new system.
View Furnace MaintenanceWhen your furnace quits at 2 a.m. in January, we run 24/7 emergency calls across the Front Range and mountain communities. We stock common igniters, flame sensors, gas valves, and blower motors on the truck so most no-heat calls are fixed in one visit, not two.
View Emergency Furnace RepairGas furnace work covers the gas valve, thermocouple, igniter, flame sensor, and heat exchanger. We pressure-test gas lines with a manometer and use a combustion analyzer to verify the air-fuel mixture. If we smell gas or find a cracked heat exchanger, we red-tag the unit and walk you through options.
View Gas Furnace RepairCall (833) 588-3896 any time, day or night. A live dispatcher answers, asks what your furnace is doing, and gives you a real arrival window. For non-emergency tune-ups and installs, email us and we'll get back to you the same business day.
Phone
(833) 588-3896Address
Colorado
Hours
Mon–Fri: 7AM – 7PM
Sat: 8AM – 4PM
Sun: Emergency Only
24/7 Emergency Available
