How Important is Double Pane Windows? (Precept 3UL & others)

Effy,
I had started out looking at the Thor ACE as well but now have my eye on the Jayco Precept 31UL. As near as I recall though the ACE doesn't have the double pan windows as an option either does it? (The Precept doesn't too) So you point being neither of this entry level coaches would offer it. But have you had any issues with only single pane? Or are you not really in extreme temperatures enough to notice? Just curious about your experience since these are two similiar coaches. Thx