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    Free Installation Quotes • Serving the Denver Metro & Northern Colorado
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Heating

Furnace Installation in Denver & Thornton, CO

A new furnace sized for your home and installed right, before the cold sets in.
Newly installed white gas furnace with new ductwork and PVC vent pipes in a clean basement utility room, snow in the window well
EPA Certified
Refrigerant Handling
OSHA Certified
Safety-Trained Crew
Residential & Commercial
Homes, Offices, Rooftops
Same-Day Response
On Most Calls
Hablamos Español
English & Spanish
Furnace Installation

A Warm Home Starts With the Right Furnace

Colorado winters are hard on a heating system, and an old furnace tends to fail on the coldest night of the year. When it’s time to replace yours, we start with a visit: we look at your home, your ductwork, and the current system, then recommend furnaces that fit your space and your budget.

You’ll get options at different price points, priced on our tablet, and the install is scheduled as soon as the equipment is ready.

What you can count on

    Sized in person, never over the phone
    Options at every price point
    Startup and safety checks before we leave

Furnace and AC Both Aging?

Replacing them together can make sense. We’ll show you the options side by side.

Get a Quote
Close-up of clean blue burner flames inside a new gas furnace with its access panel open
What's Included

What's Included in Your Furnace Installation

In-home walkthrough and sizing
Furnace options, priced in writing
Removal of the old furnace
Installation, venting, and connections
Startup and safety checks
A walkthrough of your thermostat
Our Process

How a Job Works with Us

Four steps, no surprises.

Call or Request a Quote.

Call (720) 701-3810 or send the form. We'll set a time to come out.

In-Home Walkthrough.

We look at the size of your home, the area that needs service, and the system you have now.

Options and a Clear Price.

You get more than one option, shown on our tablet, with a written contract you can sign on the spot or by email.

Scheduled Fast.

Once you choose, we check equipment with our supplier. When it's in stock, many jobs can start the next day.
Why K&G Builders HVAC

We Show You What We Find

Some customers have been burned by a contractor who found a problem and never showed them why. We'd rather earn your trust by showing you.
    Simple checks first
    Capacitor, relay, wiring, then the bigger parts.
    One cause at a time
    We follow the system in order until the real problem shows up.
    You see it too
    We explain what we found and what it means for you.
    Then we talk options
    A clear price for each path, and no pressure to pick the priciest one.
Gabriel Alberto and Carlos David of K&G Builders HVAC in a mechanical room
Local & Hands-On

A Small Team That Knows Your Name

When you call K&G Builders HVAC, you talk to Gabe. When we come to your home, it's our own technicians doing the work.
    Based in Thornton
    Serving the Denver metro and the Front Range.
    Homes and businesses
    From a single furnace to rooftop equipment.
    English and Spanish
    Hablamos español.
    Everything in writing
    Contract on our tablet, copy in your email.
Gabriel Alberto, managing member of K&G Builders HVAC
Our Work

Recent HVAC Projects

Recent work by our own team, from commercial mechanical rooms to ductless mini-splits.
Commercial boiler room with a storage tank, two wall-hung boilers and insulated piping, installed by K&G Builders HVAC
Commercial Mechanical Room Installation
Technician checking a ductless mini-split's air temperature with an infrared thermometer
Ductless Mini-Split Project
Reviews

What Our Customers Say

Most of our work comes from referrals and neighbors. Here's what customers say.
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Areas We Serve

Based in Thornton, working across the Denver metro and the Front Range. Don't see your city? Call and ask.
FAQ

Furnace Installation Questions

What homeowners ask before replacing a furnace.

How long does a furnace last?

Many last 15 to 20 years with regular maintenance, but age alone doesn’t decide it. We’ll look at condition, efficiency, and repair costs with you.

Can you replace my furnace and AC together?

Yes, and it can make sense when both are aging. We’ll show you the options side by side.

Do you install heat pumps instead of furnaces?

Yes. See Heat Pumps, or ask during the walkthrough.

What if my heat goes out before the install?

Call us. We’ll do what we can to get you some heat in the meantime.

Get Started

Get Your Furnace Installation Quote

    Thornton, CO 80241
    kgbuildersco@icloud.com
Gabriel Alberto and Carlos David of K&G Builders HVAC in a mechanical room