we got first floor and half of second floor built 4-5 years ago. at the time dad got all ac outside units moved to the roof so all piping were laid by the daikin guys in the outside wall (inside the wall cemented so replacing it is not really an option without breaking the wall again). dad said that same piping was used for all ACs. 4 ACs were installed on the first floor (2 of them have pipes going to the roof along with 2 on the ground floor). all purchased from the same daikin guys. so if r32 was used in daikin acs 4-5 years ago, the piping should be the same for the ground floor acs as well. i mean are the pipes different in design or material or thickness that one can check before buying the ac?
***
Update: Ended up buying Daikin...