RFID sensors

AdamFaz:
Okay, so my scenario includes atleast 5-10 rfid sensors. These sensors will be placed in a room at most 100 square metres. The reason why I am considering rfid is because they have no wires or batteries. I should be able to record the temperatures in the room which would then send data to my webserver.

What would be the best way to do this?

Please identify and show links to the RFiD sensors with no wired and batteries!!!

Paul