I currently have a 3 ton Trane that is on it's last legs. We have 2
mini split systems in this house already, one just for our bedroom
that they could never get cold enough for my wife on the Trane and one
for an addition. Both are fairly new and working fine.
I am seriously thinking about ditching the ducted system and going for
a 3 head mini split for the rest of the house. I would really like to
get the duct work out of a 140 degree attic. This would also let me
zone out the 2 bedrooms we seldom use.
This is an open plan with the living room dining area and kitchen all
open. My thought was a compact cassette unit there and a wall head in
the other 2 bedrooms. The cassette will accommodate a 4" duct for the
master bath. That may need to be the 18KBTU model
I get convincing arguments from contractors both ways and old school
guys say I should go back with the central system.