These windows are dual pane windows but I live less than 50 below the Canadian border in NE Washington. This product is easy to use and the hair dryer does what the product says it will. I had enough tape and it sticks very well at least for me. I bought the kit for 5 windows and got 4 very odd shaped windows done with a little material left over. It did help having the wife help out… two does well with this and yesterday morning it was 8 degrees and the cold transfer was bad in the dining room, but this morning with the treatment it was far and above better. I am totally happy with this product. It does what it says it will.
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