These really make a difference in keeping out the cold, outside air from leaking through!

I not longer feel the cool air coming in the house from my outlet that was added for a roller door cover for hurricanes.

Installed these on the exterior and interior walls. They were exactly what I wanted. The punch-outs are for the traditional switch that has a raised rectangle all around it. The vinyl wall plates bend a great deal and do not seal as well as the metal or plastic wall plates.

My 1960's house has metal electrical boxes with lots of holes inside and has gaps where the metal sides attach to the top and bottom metal. I bought low odor acrylic latex caulk and caulked the inside of all electrical boxes. I was never able to seal the inside completely, but it was much improved. I then replaced switches and receptacles as needed followed by applying the gasket cover to either the outlet or the cover.

Double and triple switch plates have the switches closer together so the foam gaskets must be trimmed. I used a utility knife for this task and then used caulk to attach the gasket to the back of the cover. In addition to saving on heating I hope that this also saves on the cost of humidifying. My inside switches did have dust in them so I know there is air flow where there shouldn't be. Be aware that the holes for the wiring (and plumbing) may not be sealed in the attic or crawl space.

Easy to install and reduces draft coming through exterior walls in our older house. The one thing I don't like is that if you have flimsy outlet covers they can cause them to bulge out a little, though not too noticeable

Nice covers. I was amazed to see there were no gasket covers under any of my light switches and outlets. Once I installed these on the outside walls, we noticed a definite change in the temperature in the house.