Quick question

Here is another question but even more harder:

there are 2 rooms made of concrete the exact same size no windows. one room contains 3 light switches labeled a,b,c. in the other room contains 3 light bulbs labeled 1,2,3. and there are two doors on the out side of each room. how do you figure out witch switch controls witch light bulb. No friends,no nothing just u and u only.

PS: you can only go in each room once

once you think you got the answer please tell me the answer on this amazing blog what the answer is and how long it took you to figure it out.
thanks
                                                                              HINT: temperature
BTW you can ask questions