"Left to right, materials both for walls and doors are the same: wood, steel, stone (granite). The rightmost one is a double-layer wall with a buffer, both walls are steel (cmbnd1 is the temperature in the buffer layer, cmbnd2 is the room inside). Bckgr is the temperature of the "outside" area (hangar itself); Init temp is the starting temperature of every room before every experiment. Every room has a standard volume and exactly the same amount of furniture. During every test, the rooms were exposed to extreme outside conditions for about 15 seconds at speed multiplier x3.

As we can see, the materials used had nothing to do with thermal insulation and behaved exactly the same regardless of whether the outside environment was colder or hotter than the inside. The only unusual thing I've spotted was that the double-walled room was cooling off a little bit faster, but was also heating up a little bit slower.

Conclusion: walls material does not matter when it comes to insulation; only walls' thickness does. Additionally, buffer-fitted walls might behave somewhat abnormally, but not to the point of being significantly more or less effective than 2-wide walls."