AC installation, Tips

Can I Just Replace My Outside AC Unit?

 September 5, 2022

By  Cool Man

Many homeowners believe that they can save money by only replacing their outdoor AC unit when it breaks down. After all, the outdoor unit is the one that does all of the work. Wrong. While it is true that the outdoor unit bears the brunt of the workload, the indoor unit is just as crucial to the overall efficiency of your AC system. Replacing both your indoor and outdoor units will result in several benefits. 

Why you should replace both indoor and outdoor units

1. You’ll Save Money in the Long Run 

While replacing your indoor and outdoor units simultaneously may cost more, it will save you money in the long run. This is because replacing both units ensures that they will be matched appropriately and that your AC system will run at peak efficiency. A mismatched or inefficient system will end up costing you more money in energy bills over time.

2. You’ll Get Better Airflow 

When your indoor and outdoor units are correctly matched, you’ll enjoy better airflow throughout your home. This means that every room in your house will be evenly cooled and that Hot spots will be a thing of the past.

3. You won’t Have to Worry About One Unit Breaking Down prematurely 

If one of your units breaks down prematurely, it puts extra strain on the other unit, which can also cause it to break down. By replacing both units simultaneously, you can rest assured knowing that your AC system can handle whatever summer throws its way.

4. You’ll Enjoy More Even Cooling 

A mismatched AC system often results in uneven cooling; some rooms may be too cold while others are too hot. When you replace both units, you can finally say goodbye to those uncomfortable temperature fluctuations and enjoy consistent cooling throughout your home. 

5. You Won’t Have to Worry About Your Warranty 

Many manufacturers void the warranty on an AC system if only one unit is replaced. So, not only do you have to pay for a new unit, but you also have to pay for any repairs that need to be made down the line out of your pocket. However, when you replace both units, you can rest easy knowing that your warranty will remain intact.

Are There Any Exemptions?

In general, it’s not recommended that you replace your outside AC unit. That said, there are a few exceptions to this rule. 

If your inside unit is less than 10 years old, it’s probably still in good condition. In this case, you may be able to get away with just replacing your outside unit. However, we still recommend you consult a professional AC installer before making any decisions. They’ll be able to look at your system and give you specific advice on what needs to be done. 

Another exception is if your outside unit is significantly smaller or larger than the inside unit. In this case, it’s likely that the two units are mismatched and need to be replaced together. Again, we recommend consulting with a professional before taking any action. 

Lastly, if your home has a unique layout or if you have special cooling needs, you may need to replace just your outside unit. This is because the size and type of your inside unit will need to be specifically chosen to match your home’s layout and cooling needs.


Replacing only one unit may seem like a great way to save money in the short run, but it will actually cost you more energy bills and repairs down the line. Not to mention, an mismatched or inefficient system often results in uneven cooling and hot spots throughout your home. So, if you’re considering replacing your AC system, replace both your indoor and outdoor units for maximum efficiency and enjoyment this summer!

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