Furnace problems can become especially noticeable when temperatures drop and the system needs to run more often. If a furnace does not start, shuts off unexpectedly or blows air that does not feel warm, check the thermostat settings and make sure the filter is not visibly blocked. Avoid repeatedly resetting equipment that continues to malfunction. Furnace repair begins with finding the cause, which could involve airflow, controls or another part of the system. Roberson Air Conditioning helps customers describe the symptoms, review inspection findings and consider the next step for their heating equipment.