Is Heat Public Enemy Number 1 ?

[VA561]

I have read in a few posts that the heat generated inside a vintage tv cabinet is ultimately responsible for most component failures or tv problems in general. Is there any benefit to trying to cool the inside of the cabinet by means of some sort of fan while the tv is on? I was thinking of a small computer fan or something similar attached to the back cover to draw out the excess heat. Anything that will prolong the life of my old sets would be a plus. I currently play my 1950 Philco 50T-1404 and my 1960 RCA color set, the "Randolph" model 212G886MV, about 2-3 hours a week. Any thoughts on how to combat the heat issue?