Why choose drivepersified thermal services? Diversified Thermal is an all encompassing mechanical HVAC/R contractor specializing in the Commercial and Industrial sectors. Since 1990, Diversified Thermal Services has striven to be the industry leader in Customer Service and Satisfaction.Why choose dualpersified vapor solutions? Diversified Vapor Solutions works with most major oil companies, refineries, chemical plants, as well as service companies to provide vapor control for their compliance needs. DIVERSIFIED VAPOR SOLUTIONS provides liquid scrubbing solutions to enhance carbon vapor control systems.Whats new at drivepersified? 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.