The premise you've been given is too broad. As said above, it depends on what brand, model, construction etc is being compared to what. Another poster above referred to windows etc being 'bad' on their C. OTOH, mine has dual pane windows and zero drafts and nominal temp transference. I think most would agree that the cabs have whatever insulation is provided by GM, Ford etc and that it's minimal but my cab is closed off when I'm camped so it's isolated and not an issue. When you shop, it will pay for you to look beyond the glitz and bling and look at mfr specs on issues like insulation?? Those specs will be far more authoritative than a bunch of opinions on a forum?