My Igloo
For my Igloo I made sure that it would be big enough and even if they go outside into the warm temperature they would have a pool to go in and get cooler. Then the walls are thick and it will have coolant foam in it to make the room colder, then it will have another wall that is made of snow to give it even more cold. Also, the floor will have a cooler like they have at hockey rinks to keep the ground cold, and will be made of ice and snow.