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View and Download Lennox ComfortSense 7000 series homeowner's manual online. ComfortSense 7000 series Touch Screen Programmable Thermostat. We chose this thermostat because it has everything we need now and might add in the near future (humidifier or UV air purification system or whatever). The userThe ComfortSense® L7742U thermostat is a 24VAC low−voltage thermostat and requires a common wire to the thermostat to operate. Observe the specifications and Read this manual before programming the thermostat. Y2081). Description. The ComfortSense® Model L7742U thermostat is an electronic 7−day.