Airman 1st Class Edgar Denard, 316th Civil Engineer Squadron heating and air conditioning apprentice, left, uses a welder to cut through a steel chill water pipe in preparation to repair an air conditioning unit at Home Traditions mechanical room as Airman 1st Class Nahn Miller, HVAC apprentice, holds the pipe steady Sept. 17. HVAC technicians perform a variety of skilled labor, such as repiping, welding, mig welding and arc welding. (U.S. Air Force photo/ Bobby Jones)