Kelvin...bi-fold door is really convenient and take up less place, but due to control "budget", i changed the one at the masterbed room only.Mine is street 93 which the common toilet is at the passageway,if change the door to other,it will be very obvious and much different from the rest of bedroom doors.Anyway i won;t close the toilet door when no one is using unless the living room has switch on the air con.
I also installed door for my kitchen entrance, it is also work like a bi-fold door but there is no bottom track and it is top hung. Not much a choice of choosing other types of door as swing door is totally out of question and sliding door is not possible.
My home reno will be finshing soon,can;t wait to move in to enjoy airconditioning room as my current home that i stay with my parent has no aircon at all.