After moving into our home last summer, we found that we had to always run the cold water faucets for quite a while to run out the (very!) hot water. We initially thought there was a problem with the hot/cold water hook-ups, but after not having any problems over the winter but with the same thing occuring this summer, I have come to the conclusion that it is because the water is heating up in the pipes which are in the attic (the house is on a slab). We have mild winters here and very hot summers. The house had copper re-piping completed a few years ago. Is there anything inexpensive that we can do to correct this problem during the summer months?