Why do my lights flicker when my air conditioner turns on?

Light flicker associated with the starting of appliances usually does not pose any safety problems and does not damage appliances. Proper wire connections and grounding are necessary to reduce flicker. Contractors and homeowners should check with their local utility regarding the appropriate wire size and transformer servicing the home. In cases where light dimming is related to the starting of a central air conditioner, and the previously discussed steps have not resolved the situation, manufacturers offer start assist kits that can be purchased which may help reduce flicker.