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In contrast, central air conditioners often can last 10 to 15 years. Similarly, how often the system was used, if it was sized and installed correctly, and if it received tune-ups when needed, can either extend or shorten this lifespan.

Common causes behind an air conditioner freezing up are low refrigerant levels, lack of adequate airflow, defective blower motor, and dirty filters or coils.

On average, an air conditioner should run between 15 and 20 minutes with a few cycles an hour. However, depending on thermostat settings and the temperature outside, you may notice your air conditioning cycle and run time changing. For example, on hotter days it may run for longer and on cooler days it may run for shorter.

Your indoor air quality may be suffering as a result of inadequate ventilation or pollutants in the air such as pollen, pet dander, dirt, mold, mildew, smoke, and VOCs. Common signs of poor indoor air quality include headaches, sinus problems, aggravated allergies or asthma symptoms, coughing, skin irritation, and sneezing.

To help improve the air quality in your home, be sure to regularly change your air filters, dust and clean your floors weekly to remove any dust or allergens, switch to eco-friendly cleaning products, purchase a dehumidifier to reduce indoor moisture, and improve air circulation within your home. You may also want to consider investing in an air cleaner or purifier.