Dimensions:

• Weight: 2 Pounds (lbs)
• Length: 1.25 Inches (In)
• Width: 6 Inches (In)
• Height: 4.5625 Inches (In)

Specifications:

• Country of Origin: MEX
• 750mV Compatible: No
• Ambient Temperature Range: 0°F to 120°F (-17.7°C to 48.8°C)
• Application: Heat/Cool or Heat Pump with Auxiliary Heat
• Auto Changeover: Yes
• Backlit: Yes
• Batteries Included: No
• Battery Backup: Yes
• Brand: Honeywell
• Built In Wi-Fi: No
• Change/Check Reminders: Yes
• Color: White
• Daylight Savings Time Ready: Yes
• Differential Temperature: ± 1°F; ±0.5°C
• Digital: Yes
• Digital-Non Programmable: Yes
• Digital-Programmable: Yes
• Display: Yes
• Display Options: Backlit, Digital
• Displays Outdoor Temperature: Yes
• Dual Transformer Compatible: Yes
• Electrical Connection: Terminals
• Electrical Rating: THM5421 is rated 20 to 30 VAC
• Fan Switching: Yes
• Heat Pump Compatible: Yes
• Humidification: Yes
• Includes: TH9421C1004 Thermostat, THM5421C1008 Equipment Interface Module and C7089U1006 Outdoor Temperature Sensor
• Indoor Remote Sensor: No
• Language: English; French; Spanish
• Low Battery Indicator: No
• Manual: No
• Mounting: Horizontal
• Operating Humidity: 5 to 90% RH, non-condensing
• Operating Temperature Range: 0°F to 120°F (-18°C to 49°C)
• Power Method: Communicating
• Programmable Fan: No
• Prop 65: No
• Removable Interface: No
• Sensing Element: Yes
• Stages Cool: 2
• Stages Heat: 3
• System Switching: Yes
• Temperature Range: Heat: 40°F to 90°F (4.4°C to 32.2°C); Cool: 60°F to 99°F (15°C to 37.2°C)
• Temperature Settings per Day: 4
• Terminal Designations: 1, 2, 3, C, R, Rc, Rh, R, W1-O/B, W2-Aux, W3-Aux2, Y, Y2, G, L, Out1, Out2, In1, In2, Dats1, Dats2, Hum1, Hum2, Dhm1, Dhm2, Vnt1, Vnt2
• Touchscreen: Yes
• Vacation Mode: Yes
• Voltage: 20-30 VAC
• Warranty Offered: Yes