Founded in 2008 by Gary Cullum, G. Cullum Heating & Cooling is family-owned and operated. Growing up in Darlington, MD, Gary began working at 16 years old for his dad at Dublin Heating & Air, beginning his experience in HVAC. After 20 years of installing Lennox equipment at Dublin, Gary decided to move to Rising Sun to work for a company in Oxford, PA. During that time, Gary began slowly gaining customers. In 2008, Gary took the leap and started his own business, working out of his own basement. G. Cullum Heating & Cooling was officially born. From 2008 to 2014, Gary continued working out of his home and slowly gained more and more customers. In 2014, he purchased the existing property off Biggs Hwy in Rising Sun, and since then G. Cullum has grown to over 3,000 customers in the Cecil, Harford, Chester, and New Castle County areas.