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're authorized installers of all major furnace brands. We specialize in Carrier, Bosch, and American Standard, but we recommend whatever equipment is best for your home's size and heating needs.

Can you repair an old furnace?

We can definitely try. We ask that you keep in mind that as the unit ages, more and more parts can start failing randomly. At a certain furnace age, it makes more sense to replace than repair, similar to an old car.

How much do you charge for a replacement quote?

It's a free estimate to provide replacement or installation pricing for furnaces with UniColorado. If you want your unit checked and repaired, the cost to come out is $120.

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're pioneering heat pumps in Colorado. From Air Source Heat Pumps to Cold-Climate Heat Pumps and fully electric systems, we can definitely help.

"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.

Do you pull permits for furnace installation?

Yes. We pull the mechanical permit, schedule the city inspection, and make sure everything passes code. The permit cost is included in your quote. You don't have to coordinate with the building department.

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 (90-98% AFUE) extract more heat from combustion, allowing them to vent through PVC pipe horizontally through an exterior wall. High efficiency models reduce gas consumption by 16-30% compared to standard units, providing substantial long-term energy savings.

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. We offer a $120 diagnostic visit to assess your current furnace, or a free estimate if you're ready for replacement.

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.

Need a New Furnace?

Furnace Installation and Replacement

Furnace installation and replacement across the Denver metro. 80–98% AFUE gas furnaces with proper load calculations. Carrier, Bosch, and American Standard. Same-day completion in most cases. Upfront pricing, permits handled.

Get Free Estimate Pricing Process FAQ

Furnace Installation and Replacement

Free in-home estimateSame-day completion in most cases100% satisfaction guarantee

Appointments available this week

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

In Colorado, where winters can be harsh and unforgiving, a reliable heating system is essential for keeping homes warm and comfortable. For most residential properties with ductwork, that 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 some models boasting AFUE ratings of up to 98%. 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.

You DeserveThe Best

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.

Permits and Inspection Handled

We pull the mechanical permit, schedule the inspection, and make sure everything passes code. You don't have to coordinate with the building department or wonder whether the work was done right.

Your SatisfactionIs Guaranteed

Our Homeowners Love Us For Denver Furnace Installation

We're proud to consistently achieve 100% homeowner satisfaction. That's the UniCo way.

5.0

Google Reviews (138)

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

Colorado's Most Experienced Heat Pump Installer

We specialize in Carrier, Bosch, and American Standard furnaces, pull all permits, and include the city inspection in the quote. Every install gets a proper load calculation and upfront pricing, no commission-based upselling.

2013

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

1000s+

Happy Homeowners

Furnace Certified

Technicians

100% Satisfaction

Guarantee

Up Front Pricing

No hidden fees

$5M+

Saved for homeowners in 2025

$9,250

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 (90-98% AFUE) can significantly improve your home's heating efficiency and lower your energy bills. 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 converting to a high efficiency furnace is a reduction in gas consumption by 16-30% compared to your current standard efficiency unit. This means substantial long-term energy savings and a more comfortable home.

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 (~5-15%)
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