Lennox Furnace Thermostat Problems The Thermostat is an important component of your Lennox air conditioning system. If something goes wrong with the air conditioner's thermostat or if it is installed incorrectly, it may have a huge impact on how comfortable you are with your unit. However, HVAC technician is not required for every Lennox air conditioner thermostat problem. Although your Lennox thermostat can assist adjust your furnace's temperature and provide you with a toasty heat feeling, it really works most effectively in addition to it's far maintenance. Your Lennox thermostat can run into easy troubles associated with battery problems and flawed settings, so behave some troubleshooting steps earlier than calling a restore technician. Solving easy troubles associated with programmable Lennox thermostats, which includes Lennox's Elite series, can maximize electricity performance and performance.