Non Texans need to bear in mind that the older homes here (through the 80s) are 2x4 construction. While this type of construction is fine for the NORMAL Texas weather, it doesn't do very well below 20°F. We had a line to the kitchen sink freeze up last night because it's on an outside wall. Fortunately, nothing burst. A box fan, the relocation of a space heater (oil filled), some time and it's now thawed out. When the temps get back into the normal range and provided the adequate funds, I intend on replacing some stuff, adding extra insulation, tyvek wrap, and new siding.