For more than a century, indoor heating and air conditioning has been making our world healthier and more comfortable. In that time, new materials and technologies have made cooling our homes safer, easier, less expensive, and better for the environment. One of the more recent developments in this long line of important innovations is the creation of high-efficiency equipment.
Ever since the late 1970s, consumer products from cars to appliances have been constantly gaining new capabilities thanks to the widespread introduction of specialized electronics. In the world of heating and cooling, electronics paved the way for the creation of ECM: a programmable, high-efficiency motor that controls air movement in furnaces, air conditioners, and heat pumps and ventilation systems.
For more than 20 years, ECM has proven itself to the heating and cooling industry as one of the most important innovations for building equipment with advanced capabilities. From quieter, more comfortable homes to cutting-edge features like smart, self-communicating systems, ECM has been the key to many advances in technology. With Evergreen AH, the same tried-and-true ECM technology that has been powering high-efficiency systems for over 20 years is now available for use in existing air handler systems. With the timeline below, you can see how ECM technology, and Evergreen, has changed over time:

ICM 1.0
The first ECM featured self-contained electronics, factory-set programming, a wide speed range, and much greater efficiency than any conventional motor available in heating and cooling equipment

ECM 2.0
The second generation of ECM added customizable programming, a replaceable electronic control, and advanced features like climate-specific operation and the ability to self-adjust for more consistent airflow

ThinkTank 2.3
In addition to the features of previous ECMs, 2.3 added updated controllers that increased overall product reliability and made the motor more resistant to moisture

ThinkTank 2.5
The industry's first "plug-and-play" communicating smart motor, ThinkTank 2.5 sends and receives commands from a furnace or air conditioner and adjusts in real time for the best possible performance

X13
To help meet increasing demand for high-efficiency equipment, X13 offers the money-saving efficiency of ECM technology without the advanced programming features of premium ECM ThinkTank motors

Evergreen
For the first time ever, the comfort and savings of ECM are now available to replace standard motors in forced-air, centralized heating and cooling systems.