The Igloo Room is a secret room for your pet's house. This room was added December 9, 2010 and is unlocked by buying the holiday special Igloo from the D.I.Y. Shop during the 2010 Winter Holiday season.
Like all secret rooms, a player can only have one room of this type; buying multiple Igloos will not get you additional rooms. Selling the Igloo will cause you to lose your room, so do not sell / recycle it or you will need to buy a new one in order to get your room back.
Also like other secret rooms, you cannot apply wallpaper or floors to this room. However, you can decorate it with other items. This room is smaller than the regular rooms in your house.
This room will be hidden from visiting friends as long as the Igloo object is in your inventory. Placing the object in a room in your house will allow friends to see the room.