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

Reliable Heating & Cooling for Denver-Metro Homes

K&G Builders HVAC installs, repairs, and maintains furnaces, AC systems, heat pumps, and mini-splits from Thornton to Castle Rock. We come out, show you what we find, and give you real options before any work starts.
Get a Quote (720) 701-3810
EPA Certified
Refrigerant Handling
OSHA Certified
Safety-Trained Crew
Residential & Commercial
Homes, Offices, Rooftops
Same-Day Response
On Most Calls
Hablamos Español
English & Spanish
What We Do

Heating, Cooling & Everything in Between

From a new furnace to a refrigerant leak, one local team handles the whole system, for homes and for businesses.
HVAC technician servicing a packaged rooftop unit on a commercial roof, Denver skyline and mountains in the distance

Commercial HVAC & Refrigeration

Commercial HVAC service, rooftop equipment maintenance, air handlers, refrigeration, and rough-in installation for Denver-metro buildings.
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Mother reading on a sofa while her daughter plays with blocks in a bright, sunlit living room with a wall return-air grille

Indoor Air Quality

UV air purification installation, mechanical-room duct cleaning, and HVAC system sanitizing for Denver-metro homes and businesses.
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Technician's hand adjusting a refrigerant manifold gauge set connected to an outdoor AC unit's service ports

Refrigerant, Vacuum & Leak Testing

Refrigerant leak testing, vacuum, repair, and recharge for AC systems, heat pumps, and refrigeration equipment across the Denver metro.
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White heat pump outdoor unit on a raised stand beside a dark gray home, with snow on the ground

Heat Pumps

Heat pump installation, repair, and service for Denver-metro homes. One system for heating and cooling, sized in person. Call (720) 701-3810.
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HVAC technician kneeling in deep snow to clear ice from a furnace's PVC vent pipes on the side of a home

Emergency HVAC Service

No heat or no AC? Call K&G Builders HVAC at (720) 701-3810 for urgent heating, cooling, and refrigeration service across the Denver metro.
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HVAC technician rinsing the coil fins of an outdoor AC condenser with a garden hose beside a blooming lilac

HVAC Maintenance & Tune-Ups

Furnace and AC tune-ups, condenser and evaporator coil cleaning, and filter changes for Denver-metro homes and businesses. Call (720) 701-3810.
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Why Homeowners Choose Us

A Contractor Who Explains Before He Sells

A lot of people have been burned by an HVAC company that said "you need a new unit" and never showed them why. Gabriel Alberto, who runs K&G Builders HVAC, hears it all the time. So every visit works the same way: we start with the small, simple checks, work through the system in order, and walk you through what we found. If a capacitor is bad, you'll know it's a capacitor. If it's the compressor, we'll show you why.

When a system needs replacing, you get more than one option. “I’m on your side,” Gabe tells customers. “I’m a homeowner too, and I don’t want you spending more than you have to.” Some customers want to repair, some want new. We lay out both and let you decide.

    Honest diagnosis.
    We test before we guess, and we show you the readings.
    Options, in writing.
    You see the price and the choices on a tablet before you sign.
    Careful installs.
    Vacuum and leak testing on refrigerant lines, so the system you pay for performs the way it should.

Serving the Whole Denver Metro

We’re based in Thornton and work across the metro, from Fort Collins and Loveland in the north to Castle Rock in the south.

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Gabriel Alberto, managing member of K&G Builders HVAC
Why Choose Us

Reliable is the Word

It's how Gabe describes the business, and it's the standard for every job, big or small.
    We come to you.
    We'd rather see your home, the space, and the equipment in person before we recommend anything.
    We work around your schedule.
    Appointments are set for a time that works for you, and we confirm before we arrive.
    We explain what we find.
    Step by step, in plain English or Spanish.
    We test our work.
    Pressure, vacuum, and leak tests before we call a job done.
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.

Areas We Serve

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

Need Heating or Cooling Help?

Tell us what's going on and we'll set a time to come out and take a look.
Get a Quote (720) 701-3810
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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Get Started

Request Your Quote

Or call us at (720) 701-3810. We usually reply the same day.
    Thornton, CO 80241
    kgbuildersco@icloud.com
Gabriel Alberto and Carlos David of K&G Builders HVAC in a mechanical room
FAQ

Common Questions

Straight answers to what homeowners ask us most. More on our FAQ page.

What areas do you serve?

We’re based in Thornton and serve the Denver metro, including Denver, Aurora, Arvada, Westminster, Golden, and Castle Rock, plus Fort Collins and Loveland to the north. Call if you’re not sure.

Do you offer free quotes?

Quotes for new installations are free. For repairs and diagnostic visits there is a trip fee, which we credit toward the job if you hire us. 

Do you work on homes or businesses?

Both. Most of our work is residential, and we also handle commercial service, rooftop equipment, and rough-in installation for commercial buildings.

Why do you want to see my home before quoting?

Because the right system depends on your home: its size, the area that needs heating or cooling, and what’s already there. A quote over the phone is a guess. We’d rather get it right.

Do you handle emergencies?

Yes. If your heat or AC is out, call (720) 701-3810 and we’ll get someone out as fast as we can.

What brands do you work with?

We work with major equipment brands including Carrier, Amana, Bosch, Daikin, Goodman, and Mitsubishi Electric.