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Blower Motor Calculator · Free Tool

Blower Motor HP
& Speed Calculator

Find the right replacement blower motor. Calculate required horsepower based on CFM, static pressure, and system size. Includes motor type recommendations.

How to Size a Replacement Blower Motor

The blower motor is the heart of your HVAC airflow system. Choosing the wrong HP, RPM, or motor type means poor performance, high energy bills, or premature failure. Use this calculator to find the right replacement.

PSC vs ECM Motors

PSC (Permanent Split Capacitor) motors run at fixed speeds and are the most common in older systems. ECM (Electronically Commutated Motor) motors are variable-speed, 60-80% more efficient, and provide better comfort and humidity control. ECM motors cost more upfront but save $100-300/year in electricity.

HP by System Size

General guidelines: 2-ton systems typically use 1/3 to 1/2 HP, 3-ton systems use 1/2 to 3/4 HP, and 4-5 ton systems use 3/4 to 1 HP. Always match the original motor's HP, RPM, rotation, voltage, and shaft dimensions.

Shop Replacement Motors

We stock OEM blower motors, condenser fan motors, and inducer motors for all major brands. Same-day shipping on orders before 3PM CST.

Frequently Asked Questions

How do I know what HP blower motor I need?
Check the nameplate on your existing motor — it lists HP, RPM, voltage, and amps. If unreadable, match by system tonnage: 2-2.5 ton = 1/3-1/2 HP, 3-3.5 ton = 1/2-3/4 HP, 4-5 ton = 3/4-1 HP for indoor blowers.
Can I upgrade from PSC to ECM?
Yes, ECM retrofit kits are available for most systems. You'll need to match the HP and ensure the control board can communicate with the ECM module. The energy savings typically pay for the upgrade in 2-3 years.
Why does my blower motor keep failing?
Common causes: dirty filters restricting airflow (motor overheats), bad run capacitor (motor works harder), oversized motor (draws too much current), or failing bearings from age. Always check the capacitor when replacing a blower motor.

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