Recently moved into a 1976 home with an original Goettl rooftop unit. Given its age and inefficiency, we're starting to think about replacing the unit. Would most appreciate any input on whether to install a split system or replace the roof mounted system.
Home is 1800 square feet, and we are probably going to enclose the back porch which is another 200 sq. ft.
We have a flat roof, so there is no attic or crawlspace - the existing ductwork is dropped from the ceiling and enclosed.
In my completely non-professional opinion, it wouldn't be too bad to install a split system as there is a storage room in the garage for the air handler that is close to the existing ductwork (about 6 feet), and the secondary unit could be placed on the outside wall of the storage room.
Thoughts on consideration of cost, efficiency, anything else we should consider? (I have no idea of cost differential between the roof vs. split)
Thank you very much!