we had VGT install heated flooring in our kitchen and laundry room, a long arduous process, six weeks! Our floor has cold spots where we notice them most : in front of the kitchen sink when doing the dishes , at the counter where the toaster is, in front of the washer and dryer, below the thermostat ( that was installed in a location of their choice not ours without consultation) at our water cooler ( ice cold there ) and at the entrance to both rooms and various spots throughout the floor. Point being where we would want heat the most, we don't have it :(
We trusted the 'pros" as we had no experience with heated flooring. We told Brad at VGT that we had many cold spots, our answer "the cold shoulder" they suggested we call the manufacturer of the product.