THE Series

Are designed for homeowners who want the security of having battery back-up power in addition to the system power in an affordable, easy-to-use thermostat with easy-view display.

Residential Thermostats


Residential Models
  • S1-THEH21N-S
  • S1-THEH21P5-S

The Source1 THE Series residential thermostats offer maximum features at a minimum price. They come loaded with the all the features you would expect at an incredibly low cost. The large and simple to read screen with bold LCD fonts set the Source One THE thermostats apart from the rest. It's great looks and reliable operation will be enjoyed for years.

Standard Features

  • Large LCD display
  • Easy to operate
  • Heat, Off, and Cool modes
  • On, Auto fan modes
  • Works with Heat Pumps
  • Room temperature & set temperature displayed
  • Setpoints are never lost in power failure
  • Fully electronic for accurate and responsive temperature control
Feature S1-THEH21N-S S1-THEH21P5-S
5 + 2 Day Programmable
Choice of Non-Programmable
Stages 2 Heat, 1 Cool 2 Heat, 1 Cool
Backlight
Heat Pump
Emergency Heat
Aux Heat Lockout
Aux Heat Indicator
Gas / Electric
Millivolt Compatible
Battery Powered
Extended Battery Life
System Powered
“Easy Access Battery Door
Low Battery Indicator
Non-Volatile Memory
Terminals in backplate
Service Filter Reminder
F or C Display
Adjustable Dead Band
Adjustable Cycles/Hour
Calibration
Door to Hide Controls
Battery Door Logo Program
S1-THELOCK
Lockring
S1-THEPLATE
Wallplate
S1-ADDWIRE
Add-A-Wire
S1-THEC11NS
S1-THEC11P5S
S1-THEH21NS
S1-THEH21P5S
S1-THEU21P7S
S1-THEU22P7S
THE Series
Are designed for homeowners who want the security of having battery back-up power in addition to the system power in an affordable, easy-to-use thermostat with easy-view display.

Residential Thermostats


Residential Models
  • S1-THEH21N-S
  • S1-THEH21P5-S

The Source1 THE Series residential thermostats offer maximum features at a minimum price. They come loaded with the all the features you would expect at an incredibly low cost. The large and simple to read screen with bold LCD fonts set the Source One THE thermostats apart from the rest. It's great looks and reliable operation will be enjoyed for years.

Standard Features

  • Large LCD display
  • Easy to operate
  • Heat, Off, and Cool modes
  • On, Auto fan modes
  • Works with Heat Pumps
  • Room temperature & set temperature displayed
  • Setpoints are never lost in power failure
  • Fully electronic for accurate and responsive temperature control
THEC11NS THEC11P5S THEH21NS THEH21P5S THEU21P7S THEU22P7S
7 Day Programmable
Commercial Thermostat
Super Cap 'battery backup'
5 + 2 Day Programmable
Choice of Non-Programmable
Stages
1 Heat, 1 Cool 1 Heat, 1 Cool 2 Heat, 1 Cool 2 Heat, 1 Cool 2 Heat, 1 Cool 2 Heat, 2 Cool
Backlight
Heat Pump
Emergency Heat
Aux Heat Lockout
Aux Heat Indicator
Gas / Electric
Millivolt Compatible
Battery Powered
Extended Battery Life
System Powered
Rc/Rh Terminals
“Easy Access Battery Door
Low Battery Indicator
Non-Volatile Memory
Terminals in backplate
Service Filter Reminder
F or C Display
Adjustable Dead Band
Adjustable Cycles/Hour
Calibration
Door to Hide Controls
Battery Door Logo Program
Energy Star
S1-THELOCK
Lockring
S1-THEPLATE
Wallplate
S1-ADDWIRE
Add-A-Wire
S1-THEC11NS
S1-THEC11P5S
S1-THEH21NS
S1-THEH21P5S
S1-THEU21P7S
S1-THEU22P7S