I hung these up the other night when we had some cooler weather coming through to see how they helped with the temperature. I noticed a slight difference in our room over night and in the morning we were able to get a few extra minutes of sleep in thanks to it blocking out the sunlight! Overall I was happy with how these curtains worked. The only thing I was a little surprised about was they are labeled as Grey, which they are, but they have white/light off white (?) stitching going long ways down the curtains. Doesnt make or break it for me, but might for some.