I would say to try and keep the room temp (or aircon temp) at around 24 degrees... that way it is neither too hot nor cold.
At such a young age I think they still aren't very good regulating their body temperature... so if the room is going to be colder you may need to rug her up more.
I have heard somewhere that they dont recommend to heat up a room too much, as it can also be a SIDS risk if baby gets too hot.