Commercial Assignment

LHCFD being dispatched to the 1200 Block Claremont Dr for reported smoke in unit of a building w/no flames seen, units responding.
(6:31PM) LHCFD E3 at scene, reports nothing visible from side alpha (Front) of the building. Investigating and will advise.
(6:33PM) E3 reports investigating a light haze, advising all other companies to level 1 stage. Continuing to investigate.
(6:39PM) BC1 at scene assuming command, E3 requesting the Truck to the roof and investigate air conditioning unit.
(6:44PM) Command giving the under control, source to be a problem with AC unit on roof. Holding 2 engines and the truck, all others to go complete/available.