I like to sleep in on the weekends and I use my RV on the weekends most of the time. This means that I dont like the sun coming in until as late as possible. The upper vent in our class C seems to let the light in the earliest so we purchased a Camco 40171 Slip Stop Vent Insulator not so much for insulation from cold or hot, but from the light. It completely blocks the light up front now and we can get an extra few Zs.
Living in Arizona though the vents are a source of heat inside the rv and the Camco 40171 Slip Stop Vent Insulator is a great insulator. It is really like a big pillow that fits in the vent. We leave ours in 24X7 and it hasnt fallen out yet. Hot or cold it is a good insulator – sunlight too.
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