24/7 Emergency HVAC Service Available — No Extra Fees for After-Hours Calls Call Now (833) 378-2513
Mon–Fri: 7am–7pm | Sat: 8am–5pm 1420 Nelson Road, Longmont, CO
(833) 378-2513
Rated 4.9/5 by 287+ Longmont Homeowners

Your Comfort Is Our Summit. Expert HVAC Services in Longmont, CO.

From furnace repairs in winter to AC emergencies in summer, our NATE-certified technicians keep Longmont homes comfortable year-round. Same-day service available.

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Licensed & Insured NATE-Certified Techs 24/7 Emergency Service
HVAC technician servicing a heating unit in Longmont, Colorado home
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Happy Customers

Licensed & Insured

Full Colorado HVAC license

Upfront Pricing

No hidden fees, ever

Satisfaction Guaranteed

100% happy or we fix it free

Same-Day Service

We show up when promised

Complete HVAC Services for Longmont Homes

From routine maintenance to emergency repairs, our NATE-certified technicians handle every heating and cooling need with expertise and care.

Furnace Repair & Installation

Gas, electric, and propane furnace services. We diagnose issues fast and install energy-efficient systems that lower your heating bills.

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AC Repair & Installation

Fast, reliable air conditioning repair and replacement. Stay cool all summer with our expert cooling solutions and maintenance plans.

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Heat Pump Services

Heat pump repair, installation, and maintenance. The efficient all-in-one solution for Colorado's variable climate.

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Ductless Mini-Splits

Perfect for additions, retrofits, and zoned comfort. Energy-efficient ductless systems installed by certified technicians.

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Indoor Air Quality

Air purifiers, humidifiers, dehumidifiers, and duct cleaning. Breathe cleaner, healthier air in your Longmont home.

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24/7 Emergency Repair

HVAC emergency? We are available around the clock with no after-hours fees. Fast response when you need it most.

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Why Summit Heating & Air

The HVAC Company Longmont Homeowners Trust

For over 17 years, we have been the go-to heating and cooling experts for families across Boulder County. We do not just fix HVAC systems — we build lasting relationships based on honesty, quality, and reliability.

NATE-Certified Technicians

Our team undergoes rigorous training and certification to handle every brand and system.

Flat-Rate Pricing

No surprises, no hourly rates. You approve the price before we start any work.

2-Hour Arrival Window

We respect your time. Our technicians arrive within a 2-hour window, guaranteed.

10-Year Warranty on Installations

Peace of mind with industry-leading warranties on all new equipment installations.

More About Our Company
NATE-certified HVAC technician working on a furnace in Longmont home

4.9 out of 5 from 287+ verified reviews

Getting HVAC Service Is Simple

Three easy steps to comfort. We handle the hard stuff so you do not have to.

1

Call or Book Online

Reach us by phone or schedule online 24/7. We offer same-day appointments for urgent issues.

2

We Diagnose & Quote

Our technician arrives on time, diagnoses the issue, and gives you upfront pricing before any work begins.

3

Enjoy Comfort Again

We fix it right the first time. You get a 100% satisfaction guarantee and lasting peace of mind.

Get Started Today

What Longmont Homeowners Say

Real reviews from real customers across Boulder County.

"Our furnace died in the middle of a January cold snap. Summit Heating had a technician at our door within 2 hours. Fair price, professional service, and our house was warm again by dinner. Cannot recommend them enough."

Sarah M. from Longmont

Sarah Mitchell

Longmont, CO

"We have used Summit for both our home and rental properties. Every time, they show up on time, explain the issue clearly, and the pricing is always transparent. Best HVAC company in Longmont, hands down."

James T. from Erie

James Torres

Erie, CO

"The maintenance plan is worth every penny. They caught a small issue before it became a $3,000 repair. The technician was polite, wore shoe covers, and cleaned up after himself. True professionals."

Karen L. from Niwot

Karen Lindquist

Niwot, CO

Read All 287 Reviews

Serving Longmont & Surrounding Communities

We are proud to be a locally owned and operated HVAC company serving Boulder County and beyond.

Longmont

Boulder

Erie

Lyons

Niwot

Berthoud
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Flexible Payment Options

HVAC Services That Fit Your Budget

A new HVAC system is a big investment. That is why we offer flexible financing options with approved credit. Low monthly payments, competitive rates, and quick approval decisions.

  • 0% APR financing for 18 months
  • Low monthly payment plans
  • Quick approval, no hidden fees
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Comfortable home with efficient HVAC system in Longmont

Ready to Experience the Summit Difference?

Whether you need emergency repair, a new installation, or routine maintenance, our team is standing by to help. Call now for same-day service.

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