What is a blower motor?
A furnace blower motor is a part that circulates air across the heating and cooling components of your HVAC system and through the ductwork into your home. The principal heating component in this process is the heat exchanger. In the cooling process, the principal component is the evaporator coil. The blower motor works essentially the same way whether your furnace runs on oil, gas, electricity, or a combination of fuels. If the motor malfunctions or breaks, your furnace may fire up and then shut down, or it may not operate at all. This is usually a sign that you need a blower motor repair or replacement.
What factors affect furnace motor replacement costs?
The total cost to replace or repair a furnace blower motor will depend on the type of motor, replacement furnace parts, manufacturer, labor costs, how accessible your furnace motor is, and whether or not it's still under warranty.
Replacement motor
Standard blower motors operate at a single speed and cost around $450 to replace, including parts and labor, while variable-speed motors cost $600 and up.
However, if your HVAC blower motor isn't too badly damaged, the technician may be able to clean and repair it so you won't have to incur the cost of a replacement. If you do need a new motor, there are three types:
Single-speeds are generally less expensive to replace than multi-speed or variable-speed blower motors. Electrically-commutated motors (ECMs) are typically quieter, more energy-efficient, and more costly to repair. If your system has a permanent split capacitor (PSC) motor that needs to be replaced, you may be able to upgrade to an ECM to improve your system's performance and efficiency.
Other replacement furnace parts
Blower motors are made up of a motor, a blower wheel (also called a "squirrel cage") and the shell. The capacitor acts like a spark plug, creating the energy needed for the motor to engage. As a result, the capacitors undergo a lot of wear and tear, and it's not uncommon for them to fail.
One Thumbtack pro and radiator repair specialist in Oakland, CA charges $179 to replace a blower motor's capacitor but says he's seen other companies charge closer to $250. If a blade on the blower wheel gets bent or becomes loose, it could cause the unit to function noisily or improperly. Replacing a blade is not expensive, but most companies charge at least $80–$100 to have a service technician pay a visit.