Is one ductless air conditioner able to cool the whole home?
Yes, if the indoor unit is properly placed such as at the top of the stair landing on the second floor, then the airflow can be adjusted to completely cool the 2nd floor and the remaining cool air travels down the stairs to the 1st floor. Through natural convection, the whole home can be cooled quickly. Hundreds of homes without ducts in Toronto have been cooled with only one unit!