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About Comfort Systems USA Southwest

When you partner with us, you will discover an end-to-end mechanical engineering company driven to be the most reliable design, build, replacement and maintenance services provider in the industry. We focus on a long-term approach by emphasizing safety and sustainability in everything we do. Our proven track record and solid reputation for dependability is unmatched. You can rest assured that we will proactively look for ways to perform better, communicate openly and operate with a commitment to integrity that provides peace of mind in a way no other company can—exceeding your expectations and establishing the foundation for a long-lasting relationship.

As responsible industry leaders, we pride ourselves on providing diverse end-to-end mechanical solutions that are not only economically feasible, but focus on results that keep your best interest in mind. Our advanced expertise and the quality of our workmanship ensures ultimate efficiency and value. If something’s not right, we’re going to fix it… and will strive to make it even better. Because we’re always pushing ourselves to the next level, making sure we’re your preferred strategic partner for years to come.

Whether your project is big or small, old or new, we’re all in when it comes to building strong relationships. We genuinely care about doing the job right, not just technically, but ethically as well. We’re always working to be the best for you, your customers and our team. We’re responsive. We listen. If it’s important to you, it’s important to us. Our dedicated team is highly qualified and possesses the expertise and experience necessary to provide answers and solutions that make sense for your business. And we will go beyond what is expected to make sure you feel valued, confident and worry-free when we’re on the job, so you can focus on what’s important to you—running your business.

History Overview

In 1962, Comfort Systems USA Southwest, then known as Tri-City Air Conditioning & Sheetmetal, was primarily focused on the residential market—along with a strong presence in repair and replacement. The Nothum family-owned business developed an impeccable reputation by focusing on ingenuity, dedication, pride of belonging, integrity, a forward-thinking mindset and the belief that consistent positive change leads to a brighter future. These are all traits that have endured.

By 1980, our focus evolved to include the commercial sector, including hospitality, retail, office buildings, schools and government work. As a commercial HVAC company, the unmatched talent of our team, in-house sheetmetal fabrication facilities and strong emphasis on customer loyalty and continuing service made us stand out from the competition.

In 1997, Tri-City experienced significant growth, going from a $3 million contractor to a $30 million mechanical and building services company. In that same year, they made the bold move of becoming part of a national consolidation of HVAC contractors. The company, along with eleven others, joined together to form Comfort Systems USA. Tri-City Mechanical subsequently became known as Comfort Systems USA Southwest.

Today, Comfort Systems USA, Inc. (NYSE: FIX) is a leading building and service provider for mechanical, electrical and plumbing building systems with more than 37 operating companies in over 140 locations across the United States. As one of those operating companies, Comfort Systems USA Southwest is proud to have the ability to leverage the resources and the buying power of a premier national company.

Comfort Systems USA Southwest has developed into one of the top mechanical contractors in the southwest, and continues to be rooted in the same honesty, integrity, innovation and customer excellence our founders built their reputation on in 1962.

Executive Leadership Team

Nate Nelson


Scott Sawyer

Chief Financial Officer

Tim Plaster

Executive VP of Building Services

Todd Stanfield

VP of Construction Sales

Mike Smith

VP of Construction

Let’s Create a Healthier, More Sustainable Future.

Comfort Systems USA Servicing Arizona Icon

(602) 437-4428 (Service)
(480) 940-8400 (Construction)

Comfort Systems USA Servicing Arizona Icon

(520) 628-8640 (Service)
(520) 629-0820 (Construction)

Comfort Systems USA Servicing New Mexico Icon

(505) 856-9250