Marshall Mechanical Share: Heating/Air Conditioning Marshall Mechanical Visit Website 3604 S US 31 Franklin, IN 46131 (317) 738-5940 (317) 738-5903 (fax) Hours: 8am-5pm M-F with 24 hour emergency service About Map About Marshall Mechanical is a HVAC/R service company with both a commercial and residential division. Directions 5 miles south of Franklin on US 31 What's Nearby? Distance: 5 10 15 20 25 50 mi.