I was just watching _The This Old House Hour_, in this season’s project house in Newton, MA amongst other things, they are adding radiant heating to a foyer and running some supply lines for an upstairs bathroom. All and all this wouldn’t that interesting, except they are doing these improvements with PEX, or Cross Linked Polyethylene. The installation looked so easy and painless I decided to investigate. The next few posts will explore the costs associated with this.