With all the great things said about the sound improvement with this product, not enough is said about the thermal value. I have a 2008 Civic and I applied this to the entire interior of the vehicle. The improvement in sound, especially base was obvious, but I began to notice that the vehicle would heat much faster and retain heat in very cold weather. during an hour drive in 30 degree weather, I had to turn off the heater because even on the lowest heat setting, the car would get very warm. im interested in seeing if it works that well with the AC in the summer. This is a great product with a very good price. After a fair ammout of internet research, this is truly the cheapest place to get this product.