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    Free Installation Quotes • Serving the Denver Metro & Northern Colorado

Refrigerant Service

Refrigerant Service, Vacuum & Leak Testing

Find the leak, fix it, and charge the system to the right level.
Technician's hand adjusting a refrigerant manifold gauge set connected to an outdoor AC unit's service ports
EPA Certified
Refrigerant Handling
OSHA Certified
Safety-Trained Crew
Residential & Commercial
Homes, Offices, Rooftops
Same-Day Response
On Most Calls
Hablamos Español
English & Spanish
Refrigerant Service

Low Refrigerant Means a Leak Somewhere

Refrigerant doesn’t get used up. If your system is low, it’s leaking. Adding more without finding the leak just puts off the next service call. We test the system under pressure and vacuum to track down the leak.

If it’s in a fitting or a line, we repair it. If it’s in the coil or the condenser, we’ll explain the options, because some people prefer to replace rather than repair. After the fix, we pull a vacuum, confirm the system holds, and charge it to the right level.

How we work

    EPA-certified refrigerant handling
    Pressure and vacuum testing
    Residential and commercial systems

Ice on Your AC Line?

Read what causes it and what to do right now.

Read the Article
Soap bubbles forming on a brazed copper refrigerant line joint during a leak test
What's Included

What's Included in Refrigerant Service

Leak search
Pressure test
Repair or replacement options
Evacuation and vacuum test
Refrigerant charged to spec
Performance check
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.
[PLACEHOLDER: verbatim customer review]
[PLACEHOLDER: verbatim customer review]
[PLACEHOLDER: verbatim customer review]

Areas We Serve

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

Refrigerant Questions

What homeowners ask about leaks and recharges.

Why is the copper line on my AC freezing?

Ice on the line usually means low refrigerant from a leak or an airflow problem like a dirty filter or coil. Turn the cooling off and call us.

Can you just top off my refrigerant?

We can, but if it’s low, it’s leaking, and it will be low again. We’d rather find the leak.

Why do you vacuum the lines?

A vacuum removes air and moisture and proves the system is sealed before we charge it. It protects the equipment and its efficiency.

Do you work on commercial refrigeration?

Yes.

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 Refrigerant Service

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