Gilmer Chamber JF Maxwell Heating & Air Building and ConstructionSub Contractors JF Maxwell Heating & Air Visit Website Request Info Ellijay, GA 30540 (706) 487-8300 Facebook About Map About Heating and cooling state licensed contractor since 1994. Serving the North Georgia area. We follow all state of Georgia codes regarding our industry. What's Nearby? Distance: 5 10 15 20 25 50 mi.