July 18, our #1 shaft Service hoist went down at over temp approx. 6:00PM. The AC units in the control room had clogged filters. We cleaned the filters, were able to cool down the control room and the VFD's were reset by 830 PM, NO damage to the hoist or hoisting equipment, a COURTESY CALL made to MSHA Hotline. This did not affect entry/egress from the mine.