HVAC Solutions: What Happens When AC Is Unused for A Long Period

air conditioning system

As a mechanical fact, most devices automatically start developing issues if they are not used for a long time. Now, the main focus in this article is – what happens when AC is unused for a long period? Of course, the answer to this disturbing question will be resolved in this piece. The answer mostly good, however, there are some precautions to take. We will give you the right HVAC solutions on this subject matter

What Happens When HVAC Units Are Not Used for 3-4 Months?

Relax! Your air conditioning system will be fine even if it remains unused for 3-4 months. Nowadays air conditioners are manufactured with high durability. Some are meant to last for decades. So far you carry out the right maintenance, your ac unit will be fine when off for just a few months. 

Some parts of the US don’t need AC units working all through the year. This is because many regions experience longer winter seasons. However, there are some precautions to take when putting on your ac after switching off for some months. 

Precautions To Take When Putting On Your Ac After Switching Off For A Long Period

The main issues with unused ac after a long period is the accumulation of debris at the outdoor unit or buildup of dust on the inside. 

Here is a list of what to do when turning on your ac after sitting unused for a long time:

  • Check the compressor if there is any debris around it or weed growing into it. Also, check for other things that could block the airflow. Clear off the debris without opening up the unit. 
  • Make sure you are up to date in terms of maintenance. If you have not done any servicing on the unit for a long time, invite your HVAC techs to service the unit before starting it. Maintenance should be done at least twice annually. 
  • First, run the AC in fan mode. Put on the fan mode from the thermostat, and allow it to run for about 15 to 20 minutes. This will help to remove any buildup dust inside the system before setting it to cool.

At the end of the summer season, if you desire to turn off the AC for a few months, then follow these guidelines for safety purposes:

  • Turn the thermostat to fan mode and make it run for at least an hour to clear out the system. 
  • Also, you could call for maintenance, to get the AC ready for the next season.

If the HVAC unit is in a good condition, these steps listed above are the right thing to do. But, if you have previously experienced any issue, call your repairer instead.


Just as stated above, if you had previously experienced any breakdown in the summer season, winter or spring is the right time to get it fixed and keep it ready for the next hot season ahead. You wouldn’t want to face an emergency repair in summer, this could tell more on your pocket, and breach your comfort.

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