Heating & Air Conditioning Expert with over 30 years of experience. Serving all of San Diego County

Mon-Fri: 7:00a - 5:00p

After hours by Appt

24hr Emergency Service

In San Diego County

Call Today 760.858.8000

Encinitas, CA 92024

Our Team

Meet Our Team

Stephen Diefenderfer - Owner

Stephen Diefenderfer


I pride myself on having an excellent and committed team of friends on staff who all share the same vision as me. To be the best in this trade. I strive to make Precision Air Inc a one stop shop that is able to meet all of our client’s mechanical needs. My goal is to provide the highest quality engineered design and installation services, on schedule, and on budget along with outstanding customer service. I understand that time and cost are crucial and I strive to go above and beyond our client’s expectations.

Ron MacArthur - Owner

Ron MacArthur


Ron has over 25 years of experience in the HVAC service industry. He began his career in 1989 serving the US Navy as a nuclear power technician, machinist and engineering laboratory technician. After serving the country for 5 years, he entered the civilian world and has become a master of the HVAC trade. Ron’s ability to adapt to rapidly changing environments, and new technology proves he’s the man! He’s a mentor and friend to the entire Precision Air Inc organization, and we all commonly refer to him as “Big Mac.”

HVAC services escondido

Service Manager

Our service manager is a highly qualified HVAC service technician with over 10 years of experience. He is an expert and can effectively diagnose and repair/replace malfunctioning HVAC equipment. When having a problem with your Heating and/or Air Conditioning equipment he is there to diagnose and solve the problem.


John Mohr


Service Administrator, handling Precision Air Inc customer service contracts. Matthew’s  goal is to support Precision Air Inc in all manners to ensure the best customer service and office management. Fielding service calls, scheduling new appointments and answering to any of your requests.