The outside AC unit can be replaced independently of the interior unit, but some factors must be considered. First and foremost, it’s important to note that air conditioning systems are designed to work as a complete unit, with both the inside and outside components working together to cool your home. 


Depending on the severity of the issue, replacing the entire system or just one component, such as the interior unit, or a repair may be the best solution.

Regardless, a well-maintained (yearly serviced) AC will last longer than one that does not receive service maintenance.

The outside AC unit vs the inside AC unit:

  • The outside unit, also known as the condenser unit, contains the compressor responsible for compressing the refrigerant and releasing heat outside. 
  • The inside or evaporator unit contains the evaporator coil, which cools the air inside your home and distributes it through the ductwork.

Call Finan Home Service in London, ON, at (226) 213 3833. We are happy to help you determine the new outdoor unit’s compatibility with your older indoor unit.

If you’re considering replacing just the outside AC unit, you must ensure the new unit is compatible with your existing indoor unit. 

  • The two units must be matched in size and efficiency to ensure optimal performance and energy efficiency. 
  • If the new unit is incompatible, you may end up with an inefficient system that doesn’t cool your home effectively or may even cause damage to your indoor unit.
  • In addition, replacing just the outside AC unit may not be the best option if your current system is nearing the end of its lifespan. 
  • If your indoor unit is more than 10 years old, it may be more cost-effective to replace the entire system rather than just one component. 
  • This is because newer systems are often more efficient and may save money on energy bills in the long run.

In some cases, replacing the entire system may be more cost-effective, especially if your indoor unit also needs repairs or replacement.

The cost of the replacement:

  • While replacing just the outside AC unit may be less expensive than replacing the entire system, it can still be a significant investment. 
  • You’ll need to factor in the cost of the new unit, installation fees, and any necessary upgrades to your existing system. 
  • Ultimately, installing both during one service call may make better financial sense.

Replacing just the outside AC unit may be a viable option when:

If your system is relatively new and well-maintained, a new outside unit may make sense for you. However, if your system is older or has a history of frequent breakdowns, replacing the entire system may be more practical to avoid future repair costs.

  • If you decide to replace just the outside AC unit, hiring a licensed and experienced HVAC professional to perform the installation is important. 
  • The technician will need to carefully match the new unit to your existing indoor unit and ensure that the installation is done correctly and safely. 
  • Improper installation can result in reduced efficiency, increased energy costs, and potential safety hazards.

Homeowners may consider replacing just the outside AC unit to upgrade their system’s efficiency and performance. 

Newer units are often more energy-efficient and may come with variable-speed compressors or programmable thermostats that can help reduce energy costs and improve comfort.

  • However, it’s important to note that upgrading just the outside unit may not provide the full benefits of a complete system replacement. 
  • If your indoor unit is older or less efficient, you may still experience higher energy costs and reduced comfort.

Replacing just the outside AC unit may be a viable option if you want to sell your home soon. 

A new outside AC unit can be an attractive selling point to potential buyers and may help increase your home’s value. 

  • However, it’s important to remember that the overall condition and efficiency of your entire HVAC system will also be a factor in a potential buyer’s decision.

Ultimately, replacing just the outside AC unit or the entire system will depend on your specific needs and circumstances. 

If you’re unsure which option is best for you, it’s recommended to consult with a licensed HVAC professional who can provide expert advice and guidance based on your unique situation.

By carefully weighing the pros and cons of each option and seeking expert advice, you can make an informed decision that will keep your home comfortable and energy-efficient for years to come. 

This post was written by Finan Home Service

May 5, 2023