To truly keep a sealed room and keep perfect temp and humidity, a mini split is the only way to go Sent from my iPhone using Grasscity Forum
Yes, a mini split requires only a 3" hole (7.5 cm) in diameter through the wall. Then seal up the hole in the wall using expanding polyurethane foam. Get Dealer Prices on Mini Splits Daikin, Midea, Cooper & Hunter, AirCon, Chigo & More!