Focused on fixing what matters.
We are the premier HVAC service provider for multi-location businesses in operation for over 20 years. Through our nationwide self-performing network, we deliver HVAC preventative maintenance, repair, and replacement that improves sustainability, maximizing your buildings’ uptime while reducing overall spend by up to 20%.
Built to Deliver at Scale
Unmatched Self-Performance
97% of services performed in-house
850+ skilled technicians
130+ branches
National Reach. Local Results.
Servicing 500,000+ HVAC units annually
Covering 150,000+ locations nationwide
Brand-Agnostic Expertise
Our technicians are trained to service all major HVAC brands
Wherever You Are, We’re Already There.
OUR STORY
A Legacy of Reliability and Growth
Lennox National Account Services (NAS) traces its roots back to 1982, when Arvid Albanese founded Industrial Air Conditioning in Fort Lauderdale, Florida. Built on a foundation of service excellence and technical expertise, the company evolved in 1998 into Industrial Building Services (IBS), expanding its focus to meet the broader needs of commercial customers. In 1999, Lennox International acquired IBS and rebranded it as Lennox NAS, creating a dedicated national account service division. Backed by Lennox’s 130-year legacy of HVAC innovation, NAS has grown into the largest HVAC service provider for multi-location businesses—delivering unmatched consistency, control, and uptime across every site we serve.