Honeywell Home RTH111B Non-Programmable

Updated September 12, 2026

Thermostat. This specific model is a simple, battery-powered digital thermostat designed for reliable, single-stage heating and cooling systems. Key Specifications & FeaturesSystem Compatibility: Works with standard gas, oil, or electric furnaces, central air conditioners, hot water systems, millivolt systems, and heat pumps without auxiliary or backup heat. Incompatibility: It cannot be used on heat pumps with backup heat, multi-stage systems, or high-voltage line electric baseboard systems C-Wire Requirement: This model does not require or use a C-wire (Common wire) for power, running entirely on battery power instead. Any existing C-wire should be taped off and tucked back into the wall during installation.Control Layout: Features basic soft-touch up and down buttons for adjusting the target temperature, a system switch (Heat / Off / Cool), and a fan switch (Auto / On).

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