Effective and Efficient Solutions

Diversified Thermal is an all encompassing mechanical HVAC/R contractor specializing in  the Commercial and Industrial sectors.

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Since 1990, Diversified Thermal Services has striven to be the industry leader in Customer Service and Satisfaction. It is our mission for every project, emergency service call, and preventative maintenance, to provide our customers with affordable, quality and effective solutions for all of their HVAC needs.

We back our first class field foreman and technicians with a support staff of the best and brightest minds in the industry. With decades of hands on technical and mechanical experience, our support staff empowers our field staff with the tools and the knowledge to solve any issue and deliver the most effective and efficient solution possible.

With departments covering all areas of commercial and industrial HVAC/R, Diversified Thermal has positioned itself as a true full service mechanical contractor able to handle any project from design and engineering, to mechanical install and retro-fit, and all the way through seamless system integration and intuitive front end system management for our customers.

Building Automation
Commercial HVAC/R Service
Construction & Retro-Fit
Industrial Refrigeration


Diversified Thermal Services is a company with an industry-wide reputation for consistent performance at the highest level of service, design, craftsmanship and customer satisfaction.

Since 1992, I have had a great working relationship with Diversified Thermal Services. They quickly figured out the issues that were plaguing our Vapor Recovery Systems. They are not only extremely efficient at the component level but also with the complete systems. They have saved us millions of dollars over the years by implementing a very precise maintenance program. They strive to make sure that our units are always in compliance with all local, state and federal regulations. They have taken ownership and it shows.
Timmy Lee Pruett, Project Manger for Pacific Southern Region, Kinder Morgan Energy Partners, LP
Diversified Thermal Services has been providing refrigeration maintenance and repairs at my Ice Skating facilities for the past sixteen years. Their employees are very reliable and knowledgeable. The service reports are clear stating the services performed and any possible recommendations needed to keep the equipment running in top condition. If my chillers go down so does my business, therefore I will only entrust my livelihood in the hands of Diversified Thermal Services.
Joe Polonsky, CEO, UTC Ice, Inc.
We at Mission Hospital have been using Diversified Thermal Services exclusively for the past 17 years as our HVAC contractor. Being a full service hospital that runs 24/7 365 days a year, we are prone to breakdowns at all, often inconvenient, hours that require emergency service. Diversified Thermal is a full service company that has always been there for us at these desperate times. They have installed cooling towers, air handlers and package units along with providing exceptional preventative maintenance and service on our chillers. Their staff is always friendly and courteous and their service is prompt and professional. I would highly recommend their services to any company or hospital that requires service on their HVAC equipment.
Joe Ortiz, Assistant Facilities Director, St. Joseph's Healthcare Systems - Mission Hospital
For several years Diversified Thermal has provided excellent workmanship and prompt responses to the never ending needs of the Long Beach Convention & Entertainment Center. Their scope of works covers installation of new equipment as well as replacement of existing HVAC equipment, and anything from small refrigeration repairs for food service to repairs of the central plants and chiller maintenance. Diversified Thermal comes highly recommended as a refrigeration service company.
Ray Blanton, Director of Facilities, Long Beach Convention & Entertainment Center
I have been working with Dan Bailey and the Automation Department at Diversified Thermal Services for a few years at multiple locations in Southern California and have always received high quality work and outstanding customer service. Diversified has installed new DDC Controls Systems for chiller plants, upgraded exisiting DDC controls, and repaired multiple control systems throughout our portfolio in Southern California. The Automation Team has demonstrated oustanding knowledge of controls and building systems far superior to any other controls vendor I have worked with over the years.
David Schroyer, Abbey Engineering, The Abbey Company
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