Air conditioning preventive maintenance is designed to keep your air conditioner running through the hot season, protect it from damage during the cold, and help it run for years as an efficient cooling machine. Understanding the many types of air conditioning preventive maintenance is crucial for knowing how to keep your system up and running.

This simple checklist will detail multiple steps that you can take in your air conditioning preventive maintenance. By following this advice, you will ensure that your air conditioner operates well for years. On top of that, you won’t have to install a new one for a while.

Air Conditioning Preventative Maintenance Checklist for 2018

Step 1: Inspect Your Filter Now

A high-quality air filter is one of the most important parts of ensuring your air conditioner runs well. Start your air conditioning preventative maintenance checklist by investigating the state of your filter. If it is dirty, remove it immediately. You may be able to clean some types of filters, but others will have to be replaced with a new one.

After cleaning your filter or installing a new one, your air conditioner should run more smoothly However, you are just getting started on the air conditioning preventive maintenance checklist. Make sure that you perform this step at least once every 90 days. In this way, you can ensure your filter stays clean. Next, you need to inspect the area around the pump. Make sure there are no residues.

Step 2: Ensuring Proper Clearance

A good air conditioning preventive maintenance process requires gauging the amount of clearance around your air conditioner. There should be at least two feet around your unit at all times. This room helps your unit breathe a little easier and ensures that it doesn’t get clogged up or blocked. A blocked air conditioner will run too coldly and may break down.

The easiest way to ensure this clearance is to install your air conditioner in an area that is free of any obstruction. However, it is also necessary to move branches, trees, hoses, and other items that may be around your unit. On the inside of the house, make sure that the vent is at least two feet from any obstruction. In this way, it will run more smoothly.

air conditioner

Step 3: Clean the Sides of Your Unit

Another important step in the air conditioning preventive maintenance process is cleaning off the sides of the unit. For example, dirt and mildew can build up on the sides and find their way inside. It is also important to know how to remove mold just in case.  Cleaning these off requires using a heavy bleach cleaner. Make sure you avoid getting any of this liquid inside of the unit.

Use a small scraper to break apart any stains on the front of the vent. These areas may not seem severe but can be filled with bacteria. That bacteria can then make its way into your unit and spread around the inside of the system. As a result, the bacteria can damage the unit or even spread through the rest of your home.

Step 4: Level Your Unit

Honestly, this step in your air conditioning preventive maintenance process should have been performed when you installed it. However, there is a chance that some units may stop being level over time. An uneven air conditioner will collect various coolant items in the unit and cause it to get too cold. Even worse, it can cause the system to break down.

Place a builder’s level on top of the unit and adjust its height until it is level. It should tilt just very slightly backward to make sure that water runs out of it when it is running. However, you should also place a small pad or protective item under the drip zone of your unit. This helps to keep it from damaging anything on the outside of your home.

Step 5: Check Your Refrigerant Lines

If your unit doesn’t have any refrigerant lines connected to it from the outside, you can ignore this step in the air conditioning preventive maintenance process. However, many types of units use an outside source of refrigerant to ensure that it runs properly. Make sure to check these lines every month to ensure they aren’t damaged. Signs of frays include worn away wire coverings and even leaks occurring inside of your home.

If you spot any frays in these lines, don’t hesitate to contact a professional right away. They will replace these frayed lines and ensure that your system runs smoothly. You should perform this preventive step once every month or so. It is particularly important to do it during the winter. This season is where the majority of the likely damage and fraying will occur.

Step 6: Managing Your Water Supply

One step that is easy to forget when performing air conditioner preventive maintenance is managing your water supply. It is important to turn your furnace’s humidifier water supply off in the summer. That’s because the extra hydration created by this system can get into your air conditioner and damage it. Turning it off prevents this problem from happening.

When the weather starts dipping to the point where you need a heater, turn the water supply back on and change the setting to about 35 to 40 percent relative humidity. Performing this simple step will ensure that your home is adequately hydrated and that your heater and air conditioner remain in solid shape through the fall and winter.


As you can see, it is relatively simple to perform high-quality air conditioning preventive maintenance. Most of these steps don’t require any specialized skills and can be done in a few hours. When you do them will vary depending on your needs. Those that didn’t have a time indicated in the listing should be done at least once every year.

However, you can also perform these air conditioning preventive maintenance steps before the change of the season. Your air conditioner will have different needs in the summer than it will in the winter. By understanding these different needs, you can prepare it for the upcoming season. Do you have any extra tips for a better air conditioning maintenance?

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