Longmont’s trusted HVAC team for 40+ years — repairs, installations & 24/7 emergency service.
Reliable HVAC Services in Longmont, CO
Heating, cooling, indoor air quality & water heater services for Longmont homes and businesses, backed by 40+ years of Colorado experience.
For over 40 years, home and business owners in Longmont, CO, have trusted SAC Mechanical for complete heating, cooling, and air quality services. We are a family-owned HVAC company built for Colorado’s Front Range climate, from 95°F July afternoons to sub-zero January nights. Our NATE-certified technicians handle everything from fast AC repair in Longmont and furnace repair to high-efficiency air conditioning installation, furnace installation, and water heater services, with 24/7 emergency service whenever you need us most.
We partner directly with industry-leading brands like Lennox, Trane, Mitsubishi, and Carrier to deliver the best residential and commercial HVAC solutions, and we back our work with an A+ rating from the Denver/Boulder Better Business Bureau (BBB). Flexible HVAC financing and seasonal specials make it easier to upgrade your comfort on any budget. When you choose SAC Mechanical, you’re choosing a local Longmont partner committed to your comfort and satisfaction year-round.
Need residential or commercial HVAC services in Longmont, CO?
Experience the difference with our expert team. To schedule your appointment, contact SAC Mechanical today.
Why Choose Us for Heating & Cooling Services in Longmont?
We know you have many options for Longmont HVAC companies. Here’s why homeowners and businesses across Boulder County keep choosing SAC Mechanical:
- 40+ Years of Local Expertise: We’ve served Longmont and the Front Range for more than four decades, we know Colorado homes, climates, and code requirements inside and out.
- NATE-Certified Technicians: Our team holds the HVAC industry’s leading certification, and we maintain an A+ rating from the Denver/Boulder Better Business Bureau.
- 24/7 Emergency Availability: Locally based crews respond fast to emergency AC and emergency heating calls, minimizing downtime and protecting your property.
- Trusted Brands: We install and service Lennox, Trane, Mitsubishi, Carrier, and all major makes and models.
- Flexible Financing & Specials: Financing options and seasonal specials make new systems and repairs affordable.
- Customer-Focused Service: Every plan, from seasonal tune-ups to complex commercial maintenance , is tailored to your needs and budget. Don’t take our word for it; read our customer reviews.
Explore Our HVAC Services in Longmont, CO
We proudly serve Longmont neighborhoods , from Old Town and Prospect to Ute Creek and Southmoor Park, plus Boulder, Firestone, and surrounding Boulder County communities. Whether you need residential AC repair or commercial HVAC installation, our local technicians know the area, climate, and home designs, ensuring optimal comfort and performance.
Air Conditioning
Heating
Indoor Air Quality
Ductless Mini-Splits
Water Heaters
Maintenance Plans
Complete HVAC Solutions for Longmont Homes & Businesses
Air Conditioning Repair, Replacement & Installation in Longmont
Longmont summers regularly push into the 90s, and an aging or struggling AC system can fail exactly when you need it most. Our technicians diagnose and fix all cooling issues fast, refrigerant leaks, failed capacitors, frozen coils, short cycling, and more, with honest, upfront recommendations. If it’s time for an upgrade, we’ll help you compare high-efficiency options and handle your AC replacement from sizing to startup. We also install smart thermostats that can trim summer cooling bills without sacrificing comfort. Enroll in an AC maintenance plan and a spring tune-up will keep your system ready before the first heat wave hits.
Furnace Repair & Heating Services Built for Colorado Winters
When temperatures drop below zero on the Front Range, a failed furnace is more than an inconvenience, it’s a safety issue. SAC Mechanical provides prompt furnace repair, expert furnace replacement, and new high-efficiency furnace installation throughout Longmont. Our heater maintenance plans include fall tune-ups that catch cracked heat exchangers, worn igniters, and airflow problems before winter, and if the worst happens overnight, our 24/7 emergency heater service has you covered. Interested in going electric? Ask us about heat pumps and home electrification, including available Colorado rebates and incentives.
Indoor Air Quality Solutions for Longmont’s Dry Climate
Colorado’s dry air, spring wildfire smoke, and seasonal allergens make indoor air quality a year-round concern for Longmont families. We design complete IAQ solutions, including whole-home air purification, whole-home humidifiers (goodbye dry skin, static, and cracked wood furnishings), dehumidifiers, and professional duct repair and sealing that improves both air quality and system efficiency. As an AprilAire partner, we bring proven IAQ products to every install.
Water Heater Repair, Replacement & Tankless Upgrades
No hot water? Rusty water? Rumbling tank? Our team handles water heater repair and water heater replacement across Longmont, and we’re experts in tankless water heater installation, delivering endless hot water, lower energy bills, and space savings for Colorado homes.
Longmont HVAC Questions Answered
By SAC Mechanical Experts
We service, repair, and install all major HVAC brands in Longmont, including Lennox, Trane, Mitsubishi, and Carrier. Our NATE-certified technicians can source parts and provide expert service for any make or model — regardless of who installed your system originally.
Yes — SAC Mechanical offers 24/7 emergency HVAC service in Longmont and across the Front Range. Whether your AC fails during a July heat wave or your furnace quits on a sub-zero night, our on-call technicians respond fast to emergency AC and emergency heating calls, so you’re never left without comfort when you need it most.
We recommend HVAC maintenance twice per year for Longmont homes: a furnace tune-up in the fall and an AC tune-up in the spring. Regular maintenance maximizes efficiency, prevents unexpected breakdowns, protects your manufacturer’s warranty, and extends equipment lifespan. Our AC and heating maintenance plans make it easy to stay on schedule.
Furnace installation costs in Longmont vary based on the unit’s efficiency rating (AFUE), system size, and installation complexity. We provide free, no-obligation quotes after a complete home assessment, so your price is accurate and transparent — and flexible financing options are available to fit your budget.
The most common warning signs are warm air from vents, weak airflow, short cycling, unusual noises or odors, and rising energy bills. If you notice any of these, schedule AC repair promptly — small issues caught early are far less expensive than a full compressor failure in the middle of summer.
Indoor air quality solutions — such as whole-home air purifiers and humidifiers — reduce allergens, dust, viruses, and wildfire smoke particles inside your home. In Longmont’s dry climate, humidifiers also relieve dry skin and static while protecting wood floors and furnishings.
As a rule of thumb, consider replacement if your system is 12–15+ years old, needs frequent repairs, uses phased-out refrigerant, or a single repair would cost more than half the price of a new unit. Our technicians give honest repair-vs-replace recommendations, and we offer financing to make AC replacement or furnace replacement affordable.
Yes. We install and replace ductless mini-split systems and heat pumps throughout Longmont — an excellent fit for additions, older homes without ductwork, and homeowners pursuing home electrification with Colorado rebates and incentives.
Trusted HVAC Experts Serving Longmont, CO & Surrounding Communities
From Old Town and Prospect to Ute Creek, Southmoor Park, and Niwot, SAC Mechanical knows the homes and businesses in our area. We understand local weather challenges, from Longmont’s hot summers to harsh winter heating demands, and tailor our AC, heating, and indoor air quality solutions accordingly.
Beyond Longmont, our technicians serve neighboring communities across the Front Range, including Boulder, Firestone, Erie, Lafayette, Louisville, Broomfield, and Loveland. See our full list of service areas.
Our technicians aren’t just certified, they’re part of the community, ready to provide fast, reliable service when you need it most.
Emergency HVAC Services in Longmont, CO
HVAC emergencies can’t wait. Our 24/7 certified technicians are available for fast AC or heating repairs, ensuring your home or business stays comfortable no matter the hour. Call for immediate service.
What Our Customers Are Saying
We're Ready to Serve You!
If you’re in need of residential or commercial HVAC services in Longmont, CO, or the surrounding area, look no further than SAC Mechanical. We offer heating, cooling, indoor air quality, and water heater solutions for every need and budget. Our team is ready to serve you 24/7. Contact us today to schedule an appointment!