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Top-Rated Central a/c installers in Longmont - Updated Nov 2026

Avatar for Behold Heating & Cooling Services
Behold Heating & Cooling Services
5.0(
87
)
Central A/C - Install

Serving Longmont, CO and surrounding areas

Approved

Super Service Award Winner

In business since 2023

Free estimates

Emergency services offered

"Brian did good work. Was able to fix the leak without having to replace the entire part. The copper tubing was installed very well and is far superior to what was there before. He was timely, friendly and professional."
Mini Split Install
A nice, new, clean Boiler - restoring heat right in time for the evening!
Glad we were able to restore heat same day for this customer.  Replaced Furnace and A/C for proper installation, air flow and 10 year warranty on FULL SYSTEM.
Glad we were able to restore heat same day.   Full Boiler replacement, repipe and zone valves.
Mini Split Install

+67

20 neighbors recently requested a quote
Recommended by41%of homeowners
Avatar for TNT Home Services
TNT Home Services
4.7(
144
)
Central A/C - Install

Serving Longmont, CO and surrounding areas

Approved

In business since 1999

Free estimates

Emergency services offered

"Despite "HomeAdvisor's" miscommunications on this one, Ron worked hard to coordinate a time with me to get my work done at a fair price. He showed up on time and took great pride in the work he did. He installed a gas line for an outdoor grill and also offered valuable advice on the use of the line and the grill itself. And, he's a veteran, which makes me so happy to give him my business in the future as well."
Home Repipe
Home Repipe
Water Heater
Water Heater
AC System Installation

+1

Response time1 day
Recommended by99%of homeowners
Avatar for Limelight Services LLC
Limelight Services LLC
4.7(
19
)
Central A/C - Install

Serving Longmont, CO and surrounding areas

Approved

In business since 2008

Emergency services offered

Warranties offered

"Limelight provides top notch service. Very thorough and customer service oriented. We are super happy with the fixture installation and appreciate their professionalism! We highly recommend them!"
Safety first!  Only hire companies that look out for the safety of their workforce!
We love seeing a new furnace installed, it means years of comfort and reliability to come!
LED tape inside and under cabinets
We own our excavation equipment, so we can be there for repairs, same day!  There is no time to waste when the waste won't flow.
Check out this beautiful spring view from a customer's home in SW Boulder, CO.  We will take care of everything you need inside and outside of your house, plumbing, HVAC, or electrical related!

+38

Response time1 day
15 neighbors recently requested a quote
Recommended by82%of homeowners
Avatar for High 5 Plumbing, Inc.
High 5 Plumbing, Inc.
4.5(
396
)
Central A/C - Install

Serving Longmont, CO and surrounding areas

Approved

In business since 2000

Emergency services offered

Warranties offered

"We contracted with High Five Plumbing to purchase and install a 40 gallon water heater to replace a 21-year-old unit. Our experience with the company was terrific. Members of the office staff were cordial, helpful, and professional, providing options and information, following-up on appointments, etc. Caleb, who installed the water heater, is a real pro and a good guy who answered all our questions and provided a thorough explanation of the various services offered by High Five. He is a credit to his company. We didn't have a plumber on our contacts list. We do now. Cliff Foster, Denver"
Water quality test
High 5s!
Team High 5
High 5 Cares!
Water pressure test

+52

4 neighbors recently requested a quote
Recommended by89%of homeowners
Avatar for Left Hand Thermal, LLC
Left Hand Thermal, LLC
5.0(
11
)
Central A/C - Install

Serving Longmont, CO and surrounding areas

Approved

In business since 2010

Free estimates

Offers commercial services

We take great pride in our experience, expertise, quality, and customer service that we provide to meet the consumer's custom needs. It is our mission to provide excellent workmanship and complete customer satisfaction from start to completion of a project. In order to understand the needs and expectations of our customers, we take great care to work and communicate with every customer in a professional manner. Our reputation is based on service, safety, and quality, regardless of how large or small the job.

Broomfield AC replacement
Broomfield AC replacement
AC replacement Frederick
AC replacement Frederick
3 neighbors recently requested a quote
Avatar for Controlling Systems
Controlling Systems
4.4(
14
)
Central A/C - Install

Serving Longmont, CO and surrounding areas

Approved

In business since 1976

Free estimates

Emergency services offered

"Every step, from the estimate with the super friendly Ryan, to the final walk-thru with the always professional Gemini, was absolutely top notch. They installed a new furnace, A/C, and tankless water heater and we are very happy with the work and final outcome. The whole crew was wonderful!"
Additional Photos
Additional Photos
Additional Photos
8 neighbors recently requested a quote
Recommended by76%of homeowners
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Showing 1-10 of 207

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