For many years, a Nest Learning Thermostat has controlled heating and cooling at Dismal Manor. About a year ago, I replaced the Nest Beta program edition with a current production Nest Learning Thermostat. In mid-April, we had a surprise run of hot days so I decided to change from heat mode to cool/heat mode. I made the change, found the thermostat calling for cooling, and hot air coming from the registers. What’s up, Nest!