Has airflow changed or weakened?
If airflow seems weak or dust is visible around the furnace, ask which equipment components are included before arranging cleaning. A blower wheel, evaporator coil, and furnace cabinet have different access requirements and should not be treated as one undifferentiated task. If the system has an AC coil, confirm whether it can be cleaned in place and how condensate drainage will be protected. Cleaning is distinct from equipment repair, so ask who should assess a control or performance fault.
Read the furnace & ac cleaning in brantford, ontario guide