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outdoor sensor and thermostat
I have a gas steam boiler in a 3 story, 6 family building (WM EG-75) with a plain thermostat in the coldest apartment. I am looking to add an outdoor sensor so that the boiler will only turn on if both the thermostat calls for heat and if the outside temperature is under 60 degrees. Any suggestions on how I can do this? Thank you for your time.