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Repair

Heating & AC Repair in Denver & Thornton

Step-by-step diagnosis, so you know exactly what failed and what it takes to fix it.
HVAC technician testing an outdoor AC unit's run capacitor with a multimeter at the open electrical panel
EPA Certified
Refrigerant Handling
OSHA Certified
Safety-Trained Crew
Residential & Commercial
Homes, Offices, Rooftops
Same-Day Response
On Most Calls
Hablamos Español
English & Spanish
Repair

Honest Diagnosis, Clear Repairs

Say your thermostat is set to 70 but the house never drops below 75. Something is wrong, and it could be one of a dozen things. We start with the small parts, like the capacitor, the relay, and the wiring, and work through the system until we find the cause. Then we show you.

If it’s a simple part, we fix it. If it’s a compressor or a coil, we’ll explain the repair, the cost, and whether replacing makes more sense. Your call, every time.

What we repair

    Furnaces, air conditioners, and heat pumps
    Thermostats, repaired or reprogrammed
    Electrical problems, found with proper diagnostics

AC Not Keeping Up?

Read what we check first when a house won’t cool down, then call us if it still won’t.

Read the Article
HVAC technician showing a homeowner a failed AC capacitor in his gloved hand inside a home's garage
What's Included

What's Included in a Repair Visit

Full system diagnostic
An explanation of what we found
A written repair price before work starts
Common parts on the van
Repair and system test
Tips to keep the problem from coming back
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.
HVAC technician in a navy uniform checking refrigerant pressures with manifold gauges at an outdoor AC condenser beside a Colorado home, mountains in the distance
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

Repair Questions

What homeowners ask when something stops working.

Why does my AC run but not cool the house?

Common causes include low refrigerant from a leak, a dirty filter or coil, airflow problems in the return, or a failing part. A diagnostic visit finds which one.

Why does my system keep turning on and off?

That’s called short cycling. It can come from an oversized system, low refrigerant, a dirty filter, a failing capacitor, or a thermostat problem.

Do you repair brands you didn't install?

Yes.

Can you fix my thermostat?

Yes, we repair and reprogram thermostats.

Do you charge for a diagnostic visit?

Yes. A trip fee covers our time and travel on repair and diagnostic visits, and we credit it toward the job if you hire us. The fee is [PLACEHOLDER: trip fee amount].

Get Started

Schedule a Repair Visit

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