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Castle Rock, CO

Heating & Cooling Services in Castle Rock, CO

Furnace, AC, heat pump, and mini-split service for Castle Rock and the south metro.
HVAC technician checking a heat pump outdoor unit beside a hillside home among ponderosa pines, a butte in the distance
EPA Certified
Refrigerant Handling
OSHA Certified
Safety-Trained Crew
Residential & Commercial
Homes, Offices, Rooftops
Same-Day Response
On Most Calls
Hablamos Español
English & Spanish
HVAC in Castle Rock

South-Metro HVAC, Explained Step by Step

Castle Rock homes deal with cold nights and hot afternoons, sometimes in the same week, and your system has to handle both. We install, repair, and maintain furnaces, central air, heat pumps, and ductless systems across Castle Rock.

Every job starts with an in-home walkthrough, so the system we recommend fits your home. You’ll see the options and the price for each before anything is scheduled.

For repairs, we follow the same process we use everywhere: simple checks first, one cause at a time, and a clear explanation of what we found.

What we do in Castle Rock

    Furnace and AC installation
    Heating and AC repair
    Mini-splits, heat pumps, and tune-ups

Heat or AC Out in Castle Rock?

Call (720) 701-3810 and tell us what’s happening. We’ll get someone to you as fast as we can.

Call (720) 701-3810
Heat pump outdoor unit beside a stone-veneer wall with patches of melting snow and a young pine
Services in Castle Rock

What We Do in Castle Rock

Here's what we do for Castle Rock homes and businesses.
HVAC technician kneeling beside a new outdoor AC condenser in a home's side yard, checking that it sits level

AC Installation & Replacement

New central air sized for your home and installed clean. In-home walkthrough, options in writing, and clear pricing across the Denver metro.
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Newly installed white gas furnace with new ductwork and PVC vent pipes in a clean basement utility room, snow in the window well

Furnace & Heating Installation

New furnaces and heating systems for Colorado winters, sized in person and installed clean. Options at every price point across the Denver metro.
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HVAC technician testing an outdoor AC unit's run capacitor with a multimeter at the open electrical panel

Heating & AC Repair

Furnace, AC, heat pump, and thermostat repair across the Denver metro. Step-by-step diagnosis, clear pricing, and usually a same-day response.
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White ductless mini-split mounted high on a sage-green wall above a reading chair and bookshelf, foothills visible through the window

Mini-Splits & Ductless Systems

Wall-mounted and ceiling ductless mini-split installation and repair for Denver-metro homes, additions, and businesses. Call (720) 701-3810.
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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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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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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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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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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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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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Neighborhoods We Cover

We serve Castle Rock and the neighborhoods around it, including these.
Why K&G Builders HVAC

Why Castle Rock Calls Us

A small team, a clear process, and the same honest diagnosis on every call.
    Quick to respond
    A same-day response on most calls.
    Honest diagnosis
    We show you what we find.
    Real options
    Repair or replace, standard or premium.
    In writing
    Contract on the tablet, copy in your email.
Gabriel Alberto and Carlos David of K&G Builders HVAC in a mechanical room
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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Visit or Call

Serving Castle Rock From Nearby

Nearby Areas We Serve

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

Castle Rock HVAC Questions

Common questions from Castle Rock homeowners and businesses.

Do you really come to Castle Rock?

Yes. Castle Rock is part of our regular service area.

How fast can you get to me in Castle Rock?

We usually respond the same day on service calls.

Is a heat pump a good fit for a Castle Rock home?

It can be. We’ll look at your home and tell you honestly whether it fits.

Do you install mini-splits in Castle Rock?

Yes, wall-mounted and ceiling units.

Is there a trip fee for Castle Rock?

A trip fee applies to repair and diagnostic visits, and we credit it toward the job if you hire us. The fee is [PLACEHOLDER: trip fee amount, and whether it’s higher for Castle Rock].

Do you serve businesses in Castle Rock?

Yes, including commercial maintenance and rooftop equipment.

Castle Rock, CO

Need Heating or Cooling Help

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