Compressor died on 2 ton, 15 year old Trane (10 SEER?) unit for the upstairs portion of my house. Downstairs is currently serviced by a 3 ton (10 SEER?) 15 year old Trane as well, that is currently in good working order...but for how long?
Question: Is there any INITIAL financial benefit for me to have both units replaced at the same time?
I understand that installing higher efficiency units will save me money in the long run; I am more interested if biting the bullet and ponying up to have both replaced could be cheaper than installing one now, and one in say 3-4 years.