I ordered a SunTouch TapeMat kit over the phone. Sales associate was polite and helpful. After a couple of weeks, I discovered that the kit wasn't large enough for my space. I looked online to see if I could just add another mat, but didn't see an answer to that specific question. I called WarmYourFloor and was once again very pleased with the customer service. The associate knew the answer right away, and helped me order an additional mat. I would wholeheartedly recommend Warm Your Floor to anyone looking to install radiant heating, especially a DIYer.