Review on 🏞️ Camco 45651 Insulated Dual Vent Cover - White, 14" x 14" - Premium Quality Solution for Improved Ventilation Efficiency" by Marcos Fiallo

Looks better when installed than stuffing a pillow in. They really slide in and out so they're easy to take off and it's great. The temperature difference in a hot Florida summer for a whole day without air conditioning and open windows was about 10 degrees - before installation inside it was up to 115, now it reaches a maximum of 105. When the air conditioning is on, it gets even better - it was 97th came out and the AC was set to 75 it got to 75 and the AC could turn off instead of running 24/7 and still couldn't get to the set temp. So yes, they are VERY helpful. In the winter I think it will be easy to stuff the vents with styrofoam and cover them with a nice cover for extra insulation/warmth.