Variable speed is GE technology that has been out there for twenty years. It is a very efficient, very quiet and very durable blower motor. The beauty of the variable speed is that it operates at a wider range of RPM than a standard blower, therefore, it helps to eliminate any hot and cold spots in the home. Additional benefits of the variable speed blower:
The variable speed blower actually increases the efficiency of any air cleaner installed by allowing the air cleaner to collect more particulates when the blower is operating at lower speeds.
The variable speed blower is very inexpensive to operate, therefore, saving you money over the standard blower.
A Trane air conditioner - when installed with a Trane variable speed furnace - actually becomes more efficient because of that variable speed blower.