And while not all contractors consistently offer ecms those who do often report increased profits as well as improved customer comfort and satisfaction.
Retrofit variable speed furnace motor.
Compared to a conventional single speed furnace a variable speed furnace performs better and uses about two thirds less electricity.
The differing speeds control heating and cooling airflow through the home.
In recent years new furnaces with bpm motors have gained market share.
But over the years several manufacturers have developed variable speed electronically commutated motors ecms specifically designed as retrofit replacements for faulty psc motors.
During the cooling mode variable speed systems typically result in an efficiency gain of about 1 seer seasonal energy efficiency ratio.
The higher the seer the lower your utility bills.
Since 1985 furnace manufacturers have used higher efficiency variable speed bpm fan motors also known as electronically commutated motors or ecms in some high end residential furnaces.
Throughout operation the furnace monitors incoming data from your hvac system to automatically make blower motor speed adjustments.
More efficient motors are available evergreen for retrofits but they pretty much function like standard multi speed psc motors.
When the r g circuit is made the blower motor operates on heating speed.
According to the manufacturer s documentation your furnace should have a 3 or 4 speed blower motor.
The problem is the furnace control module doesn t use a separate speed when the unit is running in continuous fan mode.