I have an old hollow wooden door with a plastic window that separates my kitchen from my enclosed back porch. My kitchen always had a slight breeze and was noticeably cooler than the rest of the house. This is a great way to help cut back on that draft until or even after I'm able to replace the door with a proper insulated one. I started noticing a difference after the heat kicked in and the kitchen stayed warmer. It stops a large amount of cold air from coming through, especially when I open the door to take our recyclables or when my cats want to get fresh air on the porch. The cats love playing the in/out game with the porch so it's nice having only a small area opening for them to pass through that isn't cutting into my heating bill each time. Major difference. So glad I got it. I've had to play around with the Velcro because I've noticed a few times that they come loose on the sides and it allows air to pass through. There is also a section midway up that doesn't fully close and has a small gap. Many reviews mention about a lacey frill on the top of theirs that wasn't on mine.
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