PVC or not this weather is kickin my butt too. I have over sized RHP's from Bob at Pro Products and my temps still drop at night.. I cant stand covering the enclosures because winter is when I'm home and I like to look in at them all the time. What I found is the biggest loss of heat is the Glass. I put a 4'x2' 1/2" piece of Foam insulation board over the glass and that fixed the problem 100%. What good is that for Display Enclosures hahahahaha. Im thinking about asking about some kind of insulated vacuum seal glass or something. Of course if the Glass was any thicker the problem would be the slider tracks and how the glass indents on the sides of the PVC. It would have to be routed wider and that wouldn't be worth the trouble or the chance of me screwing it up.
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