What Kind of Air Filter Should You Use?

In our last blog, we discussed how often you should change your air filter. Now, let’s talk about what kind of filter you should be using.

First, it’s important to note that these suggestions are for the average person. If you have significant respiratory issues, allergies, or other chronic medical conditions, consult your doctor or an industrial hygienist for specific advice about your home’s indoor air quality.

Contrary to popular belief and the brilliant marketing from filter manufacturers, the air filter in your air conditioning system serves one primary purpose: to protect the indoor coil from getting dirty. It was never intended to purify your home's air.

The Truth About High-Efficiency Filters

You might see advertisements for high-efficiency air filters endorsed by celebrities, but most of these filters can significantly degrade the efficiency and capacity of your AC system. Studies show that these filters can reduce your AC system's efficiency by up to 40%. The manufacturers and celebrity endorsers are not concerned about your utility bill or how well your home cools—they just want to sell expensive filters.

Why Are High-Efficiency Filters Bad?

AC systems have blower motors designed to circulate air through your home. These motors are sized to move a certain amount of air and overcome a predetermined amount of resistance. This resistance, known as "static pressure" or "pressure drop," comes from air passing through grills, ducts, and the filter. If the resistance is too high, the system’s ability to circulate air diminishes, leading to longer run times, poor cooling, and potential mechanical breakdowns.

So, What Kind of Filter Should I Use?

The good news is that the best filter for your system is usually the cheap fiberglass one. These filters are the least restrictive and have the least impact on your AC system’s efficiency and capacity. They will help your home stay cool during the hot summer days and, when combined with a maintenance program that includes routine cleaning, your AC equipment will remain clean and efficient, keeping your power bill as low as possible.

For those concerned about foot traffic or excessive pet hair, a basic pleated filter can also work. Just ensure it’s not too restrictive. Typically, the more expensive the filter, the more restrictive it is. A basic $4.00 pleated filter will be more than adequate for most homes.

Conclusion

Choosing the right air filter for your AC system can save you money and ensure optimal performance. Avoid high-efficiency filters and opt for cheaper options that maintain proper airflow. If you have questions about your filter, feel free to call our office at 941-378-2080, and we’ll be glad to help!