I attended heathers Cochran home to perform the plan service on her 15 yr old furnace in her new home. I found the ducts dirty, the condensate collector box showed signs of leaking and the furnace control board was set up for a 2 stage thermostat, but was not wired for a 2 stage thermostat. This meant the the furnace never came out of low fire. Set control board properly and ensured furnace went to high fire. Humidifier requires a new evaporator pad. The hw tank is 15 yrs old and they do not have ac.