We have had continual problems with the water temperature in our kitchen and master bathroom (rear side of our home, facing west). In the summer, the cold water is extremely hot and requires a long time before it cools. This is a significant waste of water. In the winter, the hot water is freezing and again, requires a significant running of water to obtain a appropriate temperature. Our builder told us this was normal because the pipes were in the attic. In addition, during the freezing cold spell last winter, our pipes in the walls facing the west (the same pipes) froze on two occasions. Have never experienced this in any other home. Called builder again and was told that "industry standard" is 2-3 minutes of running water to obtain appropriate temperature.