After moving to Dallas, TX with our young family, we purchased a single story, ranch style, slab foundation home built in the early 1980's. Last winter, we had our second slab leak from the copper pipes and decided to redo the entire home with PEX tubing. The PEX was run through the attic to the various plumbing fixtures and everything was great until this summer. The water coming out of the cold line is actually hotter than what comes out of the hot line due to the heat in our attic. My daughters have burned their hands and the toilets actually make steam when you flush them. It is insane! Heat transfer from the attic to the PEX cold water lines was never an issue raised by the plumbers nor did I think to ask in the dead of winter with three women and no running water. :) The plumber said we just have to let the hot, attic water flush through the lines for approx. 5 minutes before using. We try to teach our children to conserve and wasting water doesn't make Mommy and Daddy look good! Any suggestions on how to keep cold water cold in Texas with PEX?