A report of an odor of burning in a Mahopac store turned out to be from activity by a contractor working on the air conditioning equipment. Mahopac Volunteer Fire Department responded Friday afternoon to the Rite-Aid Pharmacy on Route 6.  A search of the premises with heat detecting infrared cameras and gas detectors, inside the building and on the roof,  led to the equipment at the rear of the building.  No fire was caused and no danger to the occupants existed.