After 37 years my Gas furnace & A/C unit must be replaced. Is it necessary to install a new chimney liner and new refrigerant lines going through the house or will the cleaning of the lines be Ok. I have had two different proposals? Confusing...Post created: 2012-10-29 Type of Equipment: Furnace Views: 19Lennox gas furnace is 37 years old and needs to be replaced. Looking into new Carrier Boost 80 furnace and corresponding A/C unit Your Answer |