Types Of HVAC Filters

Posted by on Nov 13, 2015 in Blog

The air filters in your HVAC system are the first and most effective measure in protecting your heating and cooling system. Any HVAC professional will tell you to change your filters often. Using fresh filters will greatly extend its life expectancy and this preventative maintenance can save you money on repairs or down the road. Not to forget to mention, they help keep up the air quality in your home.

Although some products claim to be effective for ninety days or even longer, most experts recommend changing your filters every thirty days. Regardless, you should inspect your filters regularly. The age of your HVAC system and the level of usage will determine how much wear and tear a filter suffers. You’ll know your filters need to be replaced when it’s coated in thick dust. When a filter is clogged up, not only is it no longer doing its job, it is decreasing the efficiency of your heating system as the dust starts to absorb heat. It also becomes a fire hazard.

What filter is best for your home? There are a variety of filters to choose from depending on your budget and desired air quality.

  • Fiberglass Filters:
    • these are your standard filters for a homeowner on a budget. They’re composed of several layers of fiberglass mesh. These filter particles by physically trapping them in a dense net. While fiberglass filters are better than nothing, they tend to clog quickly and allow a large percentage of smaller particulates pass through.
  • Electrostatic Filters:
    • these filters are made from a material that generates an electrostatic charge as air flows through them. This static acts like a magnet for dust particles, attracting them and locking them into the filter. These are generally considered more effective than fiberglass filters, especially for residents with asthma, allergies or other respiratory problems. They should still be replaced at least monthly to get their full benefit.
  • Electronic Filters:
    • these filters operate by either drawing particles in with an artificially generated electrostatic charge, or by passing air through an ionizing device to charge the air around it and create an attraction between airborne particles and the filter. In either case, these filters are plugged into a power source and can be cleaned instead of replaced. These are generally considered the top of the line in filtration systems, and come with a increase in price.
  • Specialty Filters:
    • there are a number of companies offering specialized filters to combat specific air quality issues. Some come pretreated with disinfectants so they not only capture particulate matter but also kill airborne bacteria or viruses that pass through, making them a good choice for the immune-suppressed, or households with children or elderly residents. Filters containing activated charcoal or carbon are available that can reduce foul odors if a household has that problem. HEPA and micro-particle filters are generally considered the best for improving air quality in the home, and can even be found as freestanding air purifiers if you don’t want to have one built into your HVAC.

Ultimately your choice in air filter comes down to budget vs. quality. For most homeowners, a standard fiberglass filter will do the trick, but for homes with older ductwork or residents with special respiratory needs, you may need to upgrade to a more effective and therefore more expensive alternative.

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