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White rectangular thermostat with blue display and push buttons

Emerson Climate Technologies

Emerson 1F89EZ-0251 Blue Series 2 Thermostat

SKU CH-EGEH-XMBBZ

Controls heating and cooling from 45 to 99 degrees with adjustable differential and dual transformer compatibility

  • TypeLearning Thermostats
  • ColorWhite
  • Easy-to-read display shows temperature clearly
  • Adjustable differential fine-tunes heating and cooling cycles
  • Works with gas, electric and heat-pump systems
  • Positive-off switch cuts power completely
  • Operates from 45 to 99 degrees Fahrenheit

Emerson Blue Series 2 Thermostat

The Emerson 1F89EZ-0251 Blue Series 2 is a low-voltage digital thermostat designed for residential heating and cooling control. It supports two heat stages and one cool stage for compatible forced-air and heat-pump systems. The unit operates with hardwired power or battery backup and includes a positive-off switch. A large easy-read display shows the current temperature and settings clearly.

For single-stage and two-stage conventional systems

This thermostat suits homeowners replacing a manual unit on electric or gas forced-air furnaces and heat pumps with auxiliary heat. It provides adjustable differential and auto-on fan settings for basic comfort management. Buyers needing humidification or dehumidification control should look elsewhere, as this model does not offer those functions. It is also not suited for communicating or proprietary equipment requiring specific data protocols.

Adjustable differential with 45 to 99 degree range

The adjustable differential lets you set the temperature swing that triggers heating or cooling cycles. The control range spans 45 degrees F minimum to 99 degrees F maximum, covering typical residential requirements. Dual transformer compatibility allows use with separate heating and cooling power sources. These specifications determine whether the thermostat matches your system design and comfort preferences.

Highlights

  • Easy-to-read display shows temperature clearly
  • Adjustable differential fine-tunes heating and cooling cycles
  • Works with gas, electric and heat-pump systems
  • Positive-off switch cuts power completely
  • Operates from 45 to 99 degrees Fahrenheit

Specifications

BrandEMERSON
TypeLearning Thermostats
ColorWhite

Questions about this item

What does the 2 H 1 C rating mean for my heating and cooling setup?

It indicates the thermostat can control two heating stages and one cooling stage, matching systems such as gas forced-air furnaces, electric forced-air furnaces, or heat pumps with auxiliary heat.

How does the hardwired and battery power arrangement work in practice?

The unit connects to low-voltage HVAC wiring for primary power and uses batteries for backup, so settings are retained during power interruptions.

What wall opening or mounting pattern does this thermostat need?

It mounts directly on a standard vertical wall surface using the included hardware; no special cut-out or oversized junction box is required.

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