1/2 HP Vs. 3/4 HP Blower Motor: Key Differences And Features

The blower motor has to be among the most vital components of an HVAC system. It’s responsible for circulating the outgoing air into your room.

Choosing the right blower motor for your cooling system often means picking the right horsepower. ½ HP and ¾ HP are the most popular options, and chances are you’re confused between these two. 

If that’s the case, keep reading our 1/2 HP vs. 3/4 HP blower motor comparison to clear all the confusion!

A Quick Comparison Between Blower Motors 

Here are the main differences at a glance, neatly placed in a comparison table for your convenience.

Specifications½ HP Blower Motor¾ HP Blower Motor
WeightUp to 16 PoundsUp to 30 Pounds
PowerBasic PowerMore Powerful
SuitabilityLighter HVAC DutyHeavier HVAC Duty
CostCheaperBit More Expensive

Major Differences Between ½ HP and ¾ HP Blower Motor

We will now dive deeper into the differences that will help you in deciding which horsepower to go for. Without any further ado, let’s get right into them. 

  • Build Quality

In many instances, you will find the build quality of ¾ HP blower motors to be significantly better than ½ HP units.

That’s simply because ½ HP ones are usually designed to be budget-friendly. 

The manufacturers reduce the cost of production by using cheaper materials. 

That’s not always the case though, as there are plenty of high-quality ½ HP units built with the best materials available. Those also cost more money to buy. 

¾ HP blower motors are designed for more heavy-duty applications, so they need to be built with better quality materials. You will often see this type of motor inside high-end devices.  

  • Weight

The weight of a blower motor depends on several factors like building materials, motor case length, motor design, etc. ½ HP blower motors tend to be pretty small in size, making them quite lightweight. 

You won’t find them going above 16 pounds usually. 

¾ HP blower motors, on the other hand, are larger in size, causing them to weigh more. They can be as much as 30 pounds. You can find them in lighter weight as well.

  • Power
3/4 HP Blower Motor
3/4 HP Blower Motor

The horsepower of a blower motor indicates the amount of work the motor is capable of producing at the rated speed and voltage.

With more horsepower, the motor will work with more power. 

½ HP blower motor is powerful enough for standard households. Compared to that, ¾ HP blower motors pack a bit more power.

They will generate increased air movement, and therefore, push more air out of the devices. 

  • Suitability

HVAC systems equipped with ½ HP blower motor will perfectly suit average households that aren’t too large. You will see this type of motor inside lighter-duty air-conditioners, furnaces, heaters, etc. 

However, when you need a more powerful HVAC system to regulate the temperature in a larger household, you will require the ¾ HP blower motor. Its extra power allows it to handle heavier operations. 

  • Noise

The rotation of the motor inevitably produces noise. You will hear louder sounds coming from ½ HP blower motors compared to their ¾ HP counterparts.

Thanks to the extra HP, the ¾ HP motors can run more efficiently, causing the noise to be a lot quieter. Many ¾ HP units also boast noise-insulating foams. If you’re annoyed by the noise, make sure to get a product with noise insulation. 

  • Cost
1/2 HP Blower Motor

Blower motors are priced differently, taking various factors into account and horsepower is undoubtedly among them.

In general, you will have to pay more money if you want to get more HP. 

As a result, ½ HP blower motors are cheaper than ¾ HP ones.

Depending on the quality of the product and the brand value of the manufacturer, the price can go well above 500 dollars. 

There are cheaper alternatives as well but make sure to check if they are good enough before purchasing.

Frequently Asked Questions (FAQs)

Let’s read a few frequently asked questions.

Is it possible to install a bigger blower motor in my furnace?

Yes, it may be possible to install a larger blower motor in your furnace that packs more power. However, make sure to check your furnace’s amp usage, voltage, and horsepower limitation before installing.

Can I switch out a ¾ HP blower motor for a ½ HP blower motor?

Sure, as long as your device allows it. You can increase the horsepower to a certain extent. However, it may not be possible to decrease horsepower. 
Always refer to the manufacturer’s manual before making any changes. You should only change the blower motor if you’re absolutely sure about needing the extra power. 

How long can I expect my AC blower motor to last?

Nowadays, modern blower motors come with tightly sealed bearings and bushings to prevent wear and tear. As a result, they boast a surprisingly long lifespan. You can expect them to run for at least 10 to 20 years.  

When should I replace my blower motor?

With time, blower motors will grow weaker and weaker before eventually failing. Poor airflow, strange noises, overheating, excessive energy bills, etc., are telltale signs of failure. When that happens, you should replace the motor to reinvigorate your HVAC system. 

Is ¾ HP blower motor more expensive than ½ HP blower motor?

Well, the price of a blower motor depends on various factors other than just horsepower. Generally speaking, a ¾ HP unit will be more expensive than a ½ HP one.


The blower motor is often called the heart of an HVAC system. So, you must install a suitable component if you want the most out of your heating and cooling devices. 

Hopefully, we’ve been able to drive out your confusion with our in-depth 1/2 HP vs. 3/4 HP blower motor comparison. The differences aren’t enormous, but they are worth considering for sure. 

Go for whichever suits your needs the most now that you know all about them!

Ralph Wade

Hey...Ralph is here! So, did you find this article useful? If so, please leave a comment and let me know. If not, please tell me how I can improve this article. Your feedback is always appreciated. Take love :)

One thought on “1/2 HP Vs. 3/4 HP Blower Motor: Key Differences And Features

  1. Thank you for posting this information it was very useful for me I wish you guys luck and keep on posting these kinds of information for us people that don’t know much about electronics etc

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