... -7..is powerful programmable room thermostat, used in single stage, 3Heat/2Cool multi-stage. Compatible with gas, oil, heat pupp or electric ... heating systems. It is used in single stage, 3Heat/2Cool multi-stage. Compatible with gas, oil, heat pupp or electric ... functions.9.Keep user setting during power loss10.Air Filter change Indicator.11.Low Battery Indicator.12.Optional temperature ...