T3900 Residential Digital Thermostat, Dual Fuel (4 Heat, 2 Cool)

Calculated at Checkout


Homeowners love Voyager thermostats – especially the large, backlit display that gives them the ability to see if the thermostat is calling for heating or cooling from across the room. Set the deadband for 1 degree and if the indoor temperature is not exactly as set, Voyager begins to actively cool or heat. For those homeowners who choose to not run a program but still want to save on operating costs, they simply press the “Away” button on their Smart phone when leaving home, and then the "Home" button before returning. With the optional ACCVWF1 WiFi module, homeowners can even change the indoor temperature using their Smart phone after getting in bed – no more getting up in the middle of the night to change thermostat settings.  


  • Gas/Electric or heat pump - Multi-stage
  • Simple as you want Operation
  • Switchable : Programmable or Non- Programmable
  • Choose 7 day, 5+2 day or 1-day programming
  • Switchable: auto-changeover, heat or cool only
  • Large. easy to read display
  • Scrolling display makes setup easy
  • Display can show dealer name, phone number and alerts
  • Adjustable backlight intensity
  • Backlit color coded buttons and legends


WiFi Thermostat Comparison Chart
Product features Venstar ACC- WiFi Module Venstar T3900 Voyager Venstar T3700 Voyager Venstar T3800 Voyager Venstar T4800 Voyager Venstar T4900 Voyager Venstar T4700 Voyager
Rfwel Part Number ACC-VWF1 T3900 T3700 T3800 T4800 T4900 T4700
4 Heat / 2 Cool
7 Day Programmable
User Interphase(Push Button)
Dehumidification Control
WiFi Built in
Outdoor Remote Sensor
Keypad lock
Humidification Control
Dimensions 5.25" x 4" x 1.1"
Mount Horizontal
Power Source Hardwired
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