The challenge of refrigerators

Recently, all sorts of logical tasks are popular on the Habr. Some of them are very complicated and kill a lot of time. One of my comrades came up with a small puzzle that does not require straining mathematical thinking, although it kneads the mosk well.

There are three rooms with absolutely identical initial thermodynamic and other parameters (volume, temperature, pressure, humidity, etc.). In each room there are absolutely identical refrigerators. In the first room, the refrigerator does not work; in the second room it works with the door closed, and in the third room it works with the door open.

The initial temperature in all rooms is + 20ºС

Question: which room will be warmer after an infinitely long period of time and why? there is no ventilation in the rooms - they are airtight.