13 Things You Didn’t Know About AC Maintenance for Summer 2025

As summer 2025 draws near, many homeowners are preparing for the heat with a simple solution: their air conditioning units. After all, the air conditioner is one of the most essential appliances for ensuring comfort during the scorching summer months. However, while most of us are aware of the importance of turning on the AC to stay cool, many don’t realize how critical proper maintenance is to keep it running efficiently and avoid costly repairs.

To help you get your AC ready for the 2025 summer heatwave, we’ve compiled a list of 13 surprising things you may not know about AC maintenance. These tips go beyond the basics and will ensure that your air conditioner operates at peak performance, saving you money on your utility bills and preventing inconvenient breakdowns.

1. A Dirty Air Filter Can Lead to Higher Bills

You’ve probably heard that cleaning or replacing your air filter is important, but did you know how much of an impact it has on your electricity bill? A clogged filter restricts airflow, forcing your AC to work harder to cool your home. This not only reduces efficiency but also leads to higher energy consumption.

Tip: Check your air filter monthly, especially during heavy use. Replace or clean it every 1-3 months, depending on the type of filter and usage.

2. AC Units Have Lifespans—But You Can Extend Them

Like any appliance, air conditioners have a lifespan. On average, an AC unit lasts between 10 and 15 years, depending on the model and how well it is maintained. However, with proper care, you can extend its lifespan by several years, avoiding the need for costly replacements.

Tip: Regular maintenance, such as cleaning the coils, checking refrigerant levels, and ensuring proper airflow, can help you get the most out of your AC unit for years to come.

3. Cleaning the Coils Improves Efficiency

The evaporator and condenser coils play an important role in heat exchange, absorbing and releasing heat. Over time, these coils can accumulate dirt and debris, which makes it harder for the unit to cool the air effectively. Dirty coils can lead to increased energy consumption and even damage your unit if not cleaned regularly.

Tip: Clean the coils at least once a year, preferably before the summer season begins, to keep your AC running smoothly.

4. Properly Positioned Thermostat Saves Energy

Did you know that the placement of your thermostat can impact the efficiency of your air conditioning system? A thermostat located in a poorly ventilated or direct sunlight area can cause your AC to work harder than necessary, leading to higher energy usage.

Tip: Install your thermostat away from heat sources, such as direct sunlight, lamps, or kitchen appliances, to ensure accurate temperature readings and more efficient cooling.

5. Your Outdoor Unit Needs Attention, Too

Many homeowners focus on maintaining the indoor components of their AC system, but the outdoor condenser unit is just as important. If the condenser is blocked by debris, plants, or dirt, it can cause the system to overheat, reducing its efficiency and lifespan.

Tip: Clear debris, leaves, and vegetation around your outdoor unit and ensure at least two feet of clearance on all sides to allow for proper airflow.

6. Cleaning the Condensate Drain Prevents Water Damage

As your air conditioner cools the air, it also removes humidity from the indoor environment, which is collected as condensation. This water needs to drain away from the unit through the condensate drain. If the drain becomes clogged, it can cause water to back up into your system, leading to water damage and even mold growth.

Tip: Regularly inspect the condensate drain to ensure it is clear of blockages. You can use a wet-dry vacuum or a bleach solution to clean the line and prevent clogs.

7. Low Refrigerant Could Mean a Leak

While it’s normal for some refrigerant to be used during the cooling process, a significant drop in refrigerant levels can signal a leak. If left unchecked, low refrigerant can cause your AC to freeze up, reducing its cooling efficiency and leading to potential damage to the compressor.

Tip: If you notice that your AC is blowing warm air, has a hissing sound, or isn’t cooling effectively, it’s time to call a professional to check for refrigerant leaks and replenish the levels.

8. Ductwork Plays a Crucial Role in AC Efficiency

Leaky or poorly insulated ducts can allow cool air to escape, meaning your AC has to work harder to maintain the desired temperature. According to the U.S. Department of Energy, duct leaks can account for a significant portion of your energy bills.

Tip: Have your ducts professionally sealed and insulated to prevent energy loss and improve cooling efficiency.

9. AC Systems Need Regular Lubrication

Air conditioners have several moving parts, including the fan and motor. These parts can become worn out or damaged over time due to lack of lubrication. Proper lubrication ensures that these parts run smoothly and prevents unnecessary wear and tear on the system.

Tip: If you’re performing DIY maintenance, consider lubricating the fan and motor (if accessible). If unsure, a professional technician can handle lubrication during an annual tune-up.

10. AC Units Work Best with Regular Professional Maintenance

While there are plenty of things you can do yourself to maintain your AC unit, professional maintenance is critical for keeping it in optimal condition. Technicians can perform a thorough inspection of the system, identify potential problems early on, and ensure that all components are functioning properly.

Tip: Schedule a professional maintenance check-up at least once a year, ideally before the summer heatwave begins, to ensure your AC is ready for heavy use.

11. AC Units Can Cause Hot Spots if Not Properly Sized

Choosing the right size air conditioner is essential for maintaining even temperatures throughout your home. If your AC unit is too small for the space, it will struggle to cool effectively, while an oversized unit can cause uncomfortable temperature fluctuations and short-cycling.

Tip: Consult with an HVAC professional to ensure that your AC unit is appropriately sized for your home’s square footage and cooling needs.

12. Sealing Windows and Doors Can Improve Efficiency

In addition to maintaining your AC unit, making sure your home is properly sealed can improve your cooling efficiency. Leaky windows and doors let cool air escape and warm air enter, forcing your AC to work harder to keep up with the temperature.

Tip: Check your windows and doors for gaps or drafts, and use weatherstripping or caulking to seal them. This will help your AC maintain a consistent temperature and reduce the energy needed to cool your home.

13. Smart Thermostats Can Help You Save Money

Smart thermostats are becoming more popular due to their energy-saving potential. These devices allow you to set schedules for your air conditioner, adjust the temperature remotely, and even track energy usage. Smart thermostats can optimize cooling patterns, ensuring your system doesn’t run unnecessarily and reducing overall energy consumption.

Tip: Install a smart thermostat to take full control of your cooling system. Many models even learn your temperature preferences and adjust automatically to maximize comfort and energy savings.

Conclusion

As we approach summer 2025, now is the perfect time to prepare your air conditioner for the intense heat. By incorporating these 13 essential AC maintenance tips into your routine, you can not only keep your system running at peak performance but also extend its lifespan, reduce the risk of breakdowns, and keep your energy bills under control.

From cleaning the coils and checking refrigerant levels to ensuring proper airflow and sealing ducts, each step you take will contribute to a more efficient and effective cooling system. Whether you choose to handle these tasks yourself or enlist the help of a professional, a well-maintained AC unit is the key to staying cool, comfortable, and energy-efficient all summer long.