No Tom heat I find tends to be worse for the lens than cold,(One of the reasons for the white lens, as they really do stop the lens heating up)..  The camera is more liable to be a problem if very cold.. UV filters being removed? They are a very tight fit and sealed.. and no more liable to condensation than the lens.. 

Danny O'Byrne  http://www.digitalartzone.co.uk/

"All the technique in the world doesn't compensate for the inability to notice" Eliott Erwitt