The blower motor is the primary component in an HVAC system’s air handler. It spins a fan which pushes hot or cold air through interior spaces until the desired temperature as set on the thermostat is reached. Even a small blower motor can move large volumes of heated or cooled air through duct work and vents, so keeping one properly maintained is crucial for peak operating efficiency. Variable-speed blower motors tend to be more efficient than single-speed ones because the variations in blown conditioned air help distribute the temperature more evenly. Variable-speed blower motors are also more energy efficient than single-speed ones because they do not have to always utilize full energy capacity to reach the desired temperature.