bigred1cav wrote:
What are they?
rockhillmanor wrote:

They fit right in the roof vent opening. I do not use the velcro that comes with it. Just push it in they will stay without having to stick anything to your coach.
Buy the one that has silver on one side, material on the other. The silver side up also helps keep your coach cool in summer.
You can find them at Walmart.


"
The Camco RV Vent Insulator
fits snugly in the vent opening to help stop heat transfer. It helps
keep your RV cooler in summer and warmer in winter. It has a removable fleece cover.
Fits standard 14 in. vents
Reflective surface helps keep out the sun's heat out.
Increases your A/C efficiency
Reduces heat transfer
Saves energy"
Any RV dealership, RV Store, or Walmart carry them. Do 'not' be tempted to buy those nasty rubber vent inserts they don't work get filthy in a heartbeat and look awful in your coach.
Using these vent covers makes a HUGE difference when running the heat or ac in an RV. Mine are over 10 years old and look like the day I bought them and still stay put without using the velcro. :C