Central Air Purifiers: What They Do and Why You Need One

Updated: February 24, 2026

Home air quality is a topic that Americans are becoming more aware of and concerned about. If indoor air is not continually flowing and properly ventilated, your home can become a toxic or unhealthy environment. A lot of different pollutants can be circulating in the air, from dust mites to bacteria to chemical fumes.

Opening the windows on a warm day is a great way to air out your house and bring in some fresh air, but there are a couple of problems with this:

1. There are only a few months out of the year during which it’s not too hot or too cold to leave the windows open, and
2. It doesn’t take care of the entire problem.

How Does a Central Air Purifier Work?

Central air purifiers are often installed into the ductwork of your residential HVAC system and provide whole-house filtration, as opposed to a portable air purifier that just cleans one room.

There are several different types of air purifiers, so it’s helpful to know how they work and what their main functions are so you can pick one that meets your needs. The three main types of air purifiers are:

• HEPA – High Efficiency Particulate Arresting (HEPA) filters are probably the most recognized and popular types of air purification systems. They use a fan to pull the air through a pleated filter that traps miniscule particles and sends the clean air back out.
• Electrostatic – This type of filter charges the trapped particles, which are then attracted to plates inside the purifier that have an opposite charge.
• Gas-phase – A gas-phase purifier removes gases and odors from the air with activated carbon.

Health Benefits of Having a Central Air Purifier

Adding a central (or whole home) air purifier to your home can help filter out dust and other airborne particles as well as toxic gases and chemical fumes. This can greatly reduce allergens and bacteria that are known to trigger allergies, breathing problems (asthma) and sickness. Air purifiers also keep mold and mildew growth to a minimum.

To read more on the benefits of central air purifiers, check out this related blog.

Even though air purifiers filter particles from your air and improve air quality in your home, it’s still important to have regular maintenance done to your HVAC system and get your ductwork cleaned professionally. This will ensure that your indoor air quality is as clean as possible.

If you live in the greater Houston area, Katy, Spring or Bellaire, call Richmond’s Air today to talk to an experienced HVAC technician about your indoor air quality and HVAC needs.