When should I replace my furnace?

Typically, we recommend replacement when the unit has become older than 15 years and is not worth putting money into repairs. Like any appliance, most furnaces have an expected lifetime of 10-20 years, lasting around 15 years on average.

What is included in furnace installation?

With UniColorado, it's a turnkey replacement process for furnaces. The price you'll be quoted is the final price you pay for a fully functioning furnace and taking away the old furnace with all equipment, materials and labor included.

What brands of furnaces do you install?

We install Carrier and Bosch furnaces and size the unit to your home's heating load. For questions about other equipment, call the office at (303) 250-1000 or get in touch through our contact page.

How much do you charge for a replacement quote?

It's a free estimate to provide replacement or installation pricing for furnaces with UniColorado.

I want to get a high efficiency furnace

Great, we can definitely help! We provide installation services for high efficiency furnaces.

I want to get an electric furnace

Great, we can definitely help! We provide installation services for electric furnaces.

I want to get a heatpump instead of a furnace

We install air source and cold-climate heat pumps and fully electric systems.

"Other" companies told me I need a furnace replacement, do I?

If your unit is 15-20 years old, the answer is likely yes. If your unit is fairly new (under 10 years old) and/or has no major issues, it can typically be repaired.

How long does a furnace last in Colorado?

Furnaces typically last 15-20 years with proper maintenance. Most units average around 15 years. We recommend replacement when the unit is older than 15 years and repair costs start adding up. Like any appliance, older furnaces become less reliable and more expensive to fix over time.

What is the difference between standard efficiency and high efficiency furnaces?

Standard efficiency furnaces (80% AFUE) use a metal flue pipe venting through the roof. High efficiency furnaces (97% AFUE) extract more heat from combustion, allowing them to vent through PVC pipe horizontally through an exterior wall.

What are signs I need a new furnace?

Replace your furnace if it's older than 15 years and needing frequent repairs, making loud or unusual noises, cycling on and off frequently, or failing to heat your home evenly. Rising gas bills despite normal usage also indicate declining efficiency. If you're ready for replacement, we offer a free estimate.

What size furnace do I need for my Denver home?

For a typical 1,500 sq ft home in Denver, you'll need a furnace with 40,000-60,000 BTU capacity. Larger homes (2,000-3,000 sq ft) typically need 60,000-100,000 BTUs. Proper sizing depends on insulation, ceiling height, window area, and layout. We perform load calculations during your free in-home estimate to determine the right size for your specific home.

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Denver Furnace Installers

Furnace installation and replacement across the Denver metro. 80% and 97% AFUE gas furnaces with proper load calculations. Carrier and Bosch. Most installs are finished in one day. Upfront pricing.

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Denver Furnace Installers

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Furnace Installation in Denver, CO

Furnace Installation and Replacement

Service for replacing or installing forced-air furnaces.

Free in-person visitTakes 15-30 minutesExpert Service

(303) 250-1000

How It Works

Brands We Install

Furnace installation in Denver CO by UniColorado

Colorado heating experts

Gas Furnace Installation & Replacement

For most residential properties with ductwork, the heating system is a gas furnace. A gas furnace is a type of forced-air heating system that uses natural gas as its fuel source. It works by heating air in a combustion chamber, then using a blower to distribute the warm air through a network of ducts to heat your home evenly. Gas furnaces are popular in Colorado for several reasons: Modern gas furnaces are highly efficient, with AFUE ratings up to 97%. Natural gas is generally less expensive than electricity, making gas furnaces an economical choice. With proper maintenance, gas furnaces can provide reliable, consistent heat for up to 20 years or more.

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See What Sets Us Apart

Proper Load Calculation

Every furnace install starts with a Manual J load calculation. We measure your home's actual heat loss, not a rule-of-thumb guess based on square footage. Oversized furnaces short-cycle, waste gas, and wear out faster. Undersized ones can't keep up on the coldest nights.

High-Altitude Setup

Denver sits at 5,280 feet. Gas furnaces need altitude-specific orifices and adjusted gas pressure to burn correctly at elevation. We set up every furnace for Colorado altitude, which affects BTU output, combustion air requirements, and venting.

Upfront Quote, No Commission

Our technicians are salaried, not commissioned. The price we quote is the price you pay, with rebates already applied. We show you the options side by side so you can pick what fits your budget and efficiency goals.

UpfrontPricing

Furnace Installation Pricing

Transparent pricing with no hidden fees. See our detailed cost guide for full breakdowns.

Efficiency Level: Standard (Single-Stage)
AFUE Rating: 80%
Cost Range (Installed)Recommended: $5,400 to $8,600

Efficiency Level: High Efficiency (Condensing)
AFUE Rating: 97%
Cost Range (Installed)Recommended: $7,500 to $11,200

Efficiency Level	AFUE Rating	Cost Range (Installed)Recommended
Standard (Single-Stage)	80%	$5,400 to $8,600
High Efficiency (Condensing)	97%	$7,500 to $11,200

Prices include equipment, labor and materials. Xcel pays $225 on a qualifying 95%+ AFUE gas furnace through its Whole Home Efficiency program, for installs through 2026.

Furnace Installation Cost GuideDetailed breakdown of furnace costs and efficiency ratings

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What'sThe Details?

Furnace Installation Process

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Your choice

Choose your path: instant pricing online, send photos for a quote, typically within 1 business day, compare an existing quote, or schedule a free in-home visit.

Installation Day

Most in 1 day

On the scheduled installation date, our skilled HVAC technicians will arrive at your residence, ready to begin the furnace installation process.

Most Installs Take One Day

Most installs

Most installs are finished in one day, which keeps disruption to your routine short.

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Real peopleReal conversations

Our Homeowners Love Us For Denver Furnace Installation

Here's what Denver homeowners say about working with UniCo.

5.0

Google Reviews

Ann M.

Had an estimate from a company that Costco uses. I was quickly convinced to switch to another product because that one had class action lawsuits. Received a $28k and was pressured to sign. Found UniColorado from an AI search and they not only saved me 5k on the total but, I have a much better furnace!! Great service, installation, follow-up and communication. Would recommend!! ⭐⭐⭐⭐⭐

Google Review

Matt T.

UniColorado has great customer service. They installed an ac and furnace for me. They additionally have come out and answered any questions I have. Their whole operation is great.

Google Review

Aaron H.

The entire team with UniColorado worked tirelessly to get our new AC/Furnace installed. Understanding that we were working with a tight time frame, the guys got the job on the schedule quickly, and then went above and beyond to make sure everything was right after a couple of things didn't go according to plan. Could not recommend UniColorado more.

Google Review

Robin M.

Brian arrived early today to look at a furnace problem I had with one of my furnaces. Turns out it was in the thermostat, which he replaced. He noticed that the furnace needed a tune-up. I asked him to look at the second furnace also, since I had them installed at the same time. It also needed a tune-up. He was pleasant and respectful of my home. He explained everything about the problems and quickly and efficiently completed the tasks. I took his card because I want to remember to call UniColorado again for all of my furnace needs.

Google Review

WhyUniColorado

How We Install Furnaces

We install Carrier and Bosch furnaces. Every install gets a proper load calculation and upfront pricing, no commission-based upselling.

2014

Our first hyper-heat install

2016

Early Lennox cold-climate adoption

2024

Bosch IDS Ultra install

2026

Latest cold-climate tech

30+

Municipalities

Master

Licensed & Certified

12,000+

Installations

Furnace Certified

Technicians

Quality Install

Guarantee

Up Front Pricing

No hidden fees

$5M+

Saved for homeowners in 2025

$7,000

Average savings

5,000+

Rebate applications submitted

Upgrade your system

Standard Efficiency to High Efficiency

Upgrading from a standard efficiency furnace (around 80% AFUE) to a high efficiency model (97% AFUE) improves your home's heating efficiency. The key difference lies in how they vent exhaust gases: Standard efficiency furnaces use metal flue pipe, venting vertically through the roof. High efficiency furnaces use PVC pipe, venting horizontally through an exterior wall. High efficiency furnaces extract more heat from the combustion process, allowing for cooler exhaust gases that can be safely vented through PVC. Many high efficiency models also include a variable speed blower motor, which adjusts airflow for quieter operation and more even heating. The major benefit of a high efficiency furnace is less gas wasted up the flue.

Simple or Complicated?

What Do Furnace Features Do?

We have compiled a list of common furnace features and a simplified explanation of what the functions and benefits are. If you want to know what our installers at UniColorado think, they say less features is better, unless you have a specific need for them.

Feature	Definition	Benefit
Single-Stage	Heating has one stage. On or off.	N/A
Two-Stage	Heating has two stages. Low & High.	Gas Efficiency
Variable-Speed	Furnace has multiple heating stages.	Gas Efficiency + Sound reduction
ECM	Blower has multiple levels of forcing air, controlled by sensors	Better airflow
Communicating	Uses sensors to control the function of the system more finely	High square footage, multi-unit systems & zoning systems

Factory certified

Furnace Brands We Install

We install Carrier and Bosch furnaces. Carrier has good parts availability in Denver and a lineup that runs from budget-friendly single-stage units to premium variable-speed models. Bosch furnaces pair well with their heat pump systems for dual fuel setups, giving you the option to add a heat pump later without replacing the furnace. At Denver's altitude, gas furnaces need specific orifice sizing and adjusted gas pressure to burn correctly. We set up every unit for 5,280 feet, not sea level. Every installation includes a Manual J load calculation.

See all brands we install

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AnsweringYour Common Questions

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