Apologies if this has been addressed previously but I did not see an earlier thread about it. Is there a general rule about protecting your racket from cold or hot weather? For example I have started playing after work and usually bring my rackets into the office with me. Until recently it's been hot down here and I didn't want to leave them in my car. I seem to remember hearing years ago that extreme heat or cold can affect your rackets--i.e., warp them. Am I being overprotective or is there some truth to this? Also is there a time limit--e.g.,Not leaving them in my car for more than an hour or so? On the other hand I know some people--admittedly not tennis diehards--who keep their rackets in their car for months on end despite the weather. Thanks in advance for any comments!