Started putting down the wood for the next walkway. the heater worked flawlessly all night long. Yeah!!! The Honeywell IUniversal sensor is working as advertised. I will still send back the old sensor to Dornback. Dinner this evening was curry chicken with Broccoli. Very nice!!! I studied some of the control system I will need for watering the next round of plants in the greenhouse. Will order from Sparkfun and Adafruit to prepare for our early April vacation in New Orleans.