Longmont, CO Expert High Velocity HVAC Service

For owners of historic, architecturally challenging or aesthetically complex homes, a conventional HVAC system may not be a consideration. The renovation and space required for ductwork can prove problematic. Fortunately, you have options. Welzig Heating and Air offers homeowners in Longmont, Colorado, cutting-edge, creative solutions to centralized temperature control, including high-velocity systems.

Enjoy the benefits of whole-home heating and cooling without tearing down walls and dealing with a huge mess. “Small-duct” alternatives utilize flexible mini ducts that can be routed through existing ceilings, floors and walls for ease of installation. These smaller tubes are insulated to prevent energy losses, reduce running times and ensure lower monthly bills. Through a process called aspiration, high-velocity HVAC achieves draft-free comfort, with temperature from floor to ceiling and room-to- room never varying more than two degrees from the thermostat setting.

Emergency High Velocity HVAC Service

From wonderful customization capabilities to exceptional humidity control, high-velocity heating and cooling is truly an advantageous opportunity. Welzig Heating and Air is happy to consult, help you make smart decisions and maximize potential. Our NATE-certified technicians not only qualify us as a Bryant Factory Authorized Dealer but are the reason behind our recognition as a three-time Circle of Champions Award winner. As you high-velocity HVAC experts, we provide new installation, seasonal maintenance, repairs and 24/7 emergency services.

High Velocity HVAC Installation, High Velocity HVAC Service & High Velocity HVAC Boulder, CO, Longmont, CO & Louisville, CO

High Velocity HVAC Installation, High Velocity HVAC Repair & High Velocity HVAC Service

High Velocity HVAC RepairHigh Velocity HVAC InstallationHigh Velocity HVAC

Satisfied Customers
They Speak For Us

Bob came out to look at our swamp cooler and was remarkably helpful and professional. Not only did he give me a knowledgeable diagnosis, but he also taught me a lot in the process. We’ll be calling him for all future needs with our cooling system.


Dave Kaplan-Gomez and James Miltersen installed my new Tankless Water Heater. Both were polite and professional. Care was taken not to damage anything in my house which I really appreciated. I use Welzig for all my HVAC needs and highly recommend them.


Our 23-year-old A/C system ran out of “borrowed time” and became too difficult to continue maintaining. With great advice from Casey Welzig,, we replaced the old system with a Bryant Evolution A/C system. Max Loustaunau and Seth Bernhardt did an excellent job with removing the old system and installing the new one. Both of them are great to work with — very professional and very personable. We are really amazed at how much better the new system works!

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