Senior Airman Daniel Nedzweckas, 99th Civil Engineering Squadron, Heating Ventilation Air Conditioning specialist, checks the status on a chiller in a critical facility on Nellis Air Force Base, Nev., October 15, 2005. HVAC personnel perform preventative maintenance on air-conditioning and heating systems during the base's "No Heat, No Cool" period. (U.S. Air Force Photo / Airman 1st Class Stephanie Rubi, RELEASED)
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