Furnace & Heating

Furnace & Heating Experts

Carroll Mechanical Services offers Carrier brand new furnace installation for homes and businesses. We also service ALL BRANDS of furnaces, heating systems, and HVAC equipment throughout Longmont and the surrounding community. Our skilled technicians and commitment to reliable service have helped us earn a reputation as the best HVAC company in Longmont, CO.

Schedule Your 24-Point Inspection Text 720-891-3518 for Emergency Service Claim Xcel Utility Rebates

New Furnace

If you are looking for a new Carrier brand furnace or heating system for your home or office, there are several options from which to choose. Carroll Mechanical Services has extensive experience with furnace installation and heating systems, and we can help you select the furnace that best meets your specific requirements. The size of the space, number of rooms, internal square footage, temperature preferences, and available utility rebate programs all play a role in determining the ideal system.

Whether you're planning a brand-new system or a furnace replacement, we’ll guide you through every step to ensure your comfort and energy efficiency. We are proud to provide comprehensive HVAC services backed by years of experience and customer satisfaction.

Schedule Your 24-Point Inspection

Dual-Fuel Hydronic Integration & High-Altitude Precision

While high-volume, sales-first "box-swapper" contractors focus on rapid, cookie-cutter replacements, Carroll Mechanical brings 25 years of local technical depth to Northern Colorado heating systems. We engineer custom hybrid solutions and high-efficiency setups that general contractors misdiagnose or decline.

Hybrid Dual-Fuel Systems

Pair high-efficiency Carrier gas furnaces with electric heat pumps to automatically switch to the most cost-effective fuel source based on outdoor temperatures.

Hydronic & Radiant Integration

Seamlessly connect forced-air furnaces with multi-zone hydronic boilers, radiant in-floor heating, or mini-splits for whole-home luxury comfort.

High-Altitude Pressure Tuning

At 5,000+ feet, thin Front Range air requires precise calibration to prevent soot accumulation, inefficient combustion, and heat exchanger failure.

Hard Water & Cold-Snap Protection

Incorporate mineral scale protection and Manual J load sizing to safeguard equipment and guarantee sub-zero reliability during severe freezes.

Furnace Inspection

Don't settle for a 5-minute "filter-change" checkup from general contractors.

Our exhaustive diagnostic evaluates carbon monoxide safety, heat exchanger integrity, and electrical balance—delivering an official Pre-Season Furnace Health Certificate to guarantee winter-long system reliability.

We offer a detailed 24-point furnace inspection, followed by professional recommendations for any necessary repairs or adjustments.

Schedule Your 24-Point Inspection

Get The Comfort You Need

With cold Colorado winters, the last thing you want is an unreliable heating system. A compromised furnace can be both inconvenient and stressful. At Carroll Mechanical Services, we take pride in providing trustworthy, 24/7 HVAC services to keep your home or business warm and safe.

Schedule Your 24-Point Inspection

Fast Emergency Visual Diagnostic

When your furnace fails during a freezing blizzard, fast service is critical. Text a clear photo of your furnace panel, diagnostic error code, or thermostat screen to 720-891-3518 for a rapid visual assessment and immediate technician dispatch across Longmont and Weld County.

Text 720-891-3518 for Emergency Service

What our customers are saying

Professional, Honest, and Affordable

"They were all very professional honest and affordable Fred the technician and both gentlemen he brought were great! They even cleaned up and hauled away all the unneeded equipment. Not to mention Janis and Nicole in the office are very knowledgeable and pleasant to talk with and Brian the owner explained everything and made us very comfortable with the services they were providing!!! We will definitely be using them again for all our future needs!"

- JD

Easy To Work With

"I like to support local, family-owned businesses. Carroll Mechanical, and the owner Brien, have been very easy to work with, and taken pains to make sure everything was done right. Installation of high-efficiency furnaces is complex. Make sure you find a good installer that has a lot of experience with the brand. These guys do. Highly recommended!"

- Curt B.

Good Experience and Fair Price

"These guys installed a new furnace and AC in my place three years ago. It was a good experience and what I think is a fair price.What really sets then apart is the service. We just had our board go bad in the AC and it feels like they worked day and night to get us up and running again. Critical for a 100 degree week in June. Seriously-- people at my house 30 minutes after calling. Amazing service."

- JM

Frequently Asked Heating & Furnace Questions in Longmont, CO

How do 2026 Colorado state tax credits and utility rebates apply to my new furnace installation?

You can stack 2026 Colorado State Energy Tax Credits with local utility rebates from Xcel Energy and Efficiency Works (serving Longmont, Loveland, and Fort Collins). Qualifying high-efficiency Carrier furnaces (95%+ AFUE) and dual-fuel heat pump systems offer thousands in combined savings. Carroll Mechanical handles the technical sizing requirements and rebate paperwork to ensure you maximize your return on investment.

What is included in Carroll Mechanical’s 24-Point Furnace Inspection?

Our comprehensive diagnostic covers safety, electrical, and mechanical integrity. Key checks include performing a life-saving Carbon Monoxide test, inspecting heat exchangers for hairline cracks, checking flame baffles and ignitors, balancing gas pressure, testing safety interlock switches, and evaluating temperature rise across your ductwork. Unlike basic "filter-change" checkups from general contractors, our 24-point tune-up ensures winter-long reliability across Front Range cold snaps.

Why is altitude and hard water protection important for heating systems in Longmont?

At 5,000+ feet, improper gas valve calibration causes incomplete combustion, soot buildup, and premature heat exchanger failure. Furthermore, Northern Front Range hard water accelerates mineral scale inside high-efficiency condensing units and hydronic loops. Carroll Mechanical techs precision-set fuel-to-air ratios specifically for Longmont’s elevation and integrate scale-prevention measures to protect system lifespan.

How do I know if I need emergency furnace repair or a full system replacement?

If your system is under 12 years old and experiencing isolated issues—like a faulty ignitor, bad blower motor, or cracked pressure switch—a repair is usually the most cost-effective path. However, if your heat exchanger is cracked (a critical safety hazard), or repair costs exceed 50% of a new system, replacement is recommended. Text a picture of your furnace panel to 720-891-3518 for a quick visual diagnostic and honest recommendation.

Can Carroll Mechanical integrate a furnace with a boiler or radiant in-floor heating system?

Yes. While standard high-volume contractors often decline or misdiagnose complex dual-heating systems, our technicians specialize in hybrid setups. We routinely service and integrate forced-air Carrier furnaces with multi-zone hydronic boilers, radiant floor loops, and ductless mini-splits for complete custom home comfort.

Ready to get started?

Carroll Mechanical Services of Longmont provides top-quality HVAC equipment, parts, and heating services 24/7 that you can trust. Whether you need emergency furnace repair, a high-efficiency Carrier system replacement, or custom dual-fuel hydronic integration, we’re here to keep you comfortable and worry-free — all from the best HVAC company in Longmont, CO.

Schedule Your 24-Point Inspection Text 720-891-3518 for Emergency Service Claim Xcel Utility Rebates