The number one thing you can do to maintain your heating and cooling system and a healthy air quality in your home is to make sure your air filter is always clean. The choices for home AC air filters have become numerous and a bit more complicated in recent years. Typically, the higher the rating, the better the filter is at removing dust and allergens. Let’s look at some of the choices more closely.
Conventional fiberglass filters
.JPG)
These are often referred to as “throw away” filters. They are flat panels of woven fiberglass capable of removing small rocks, and that’s about it. These filters usually have a lower performance rating than other filters, but are the least expensive. Most carry a MERV rating (Minimum Efficiency Reporting Value) of about 4. They can be used as a pre-filter or main filter. If used as the main and only source of filtration, you will need to change them out at least once a month. These filters are a poor choice for those with respiratory problems.
Pleated filters (MERV rating under 11)
These have a higher rating than the flat panel fiberglass filters and are still considered affordable. They last longer than the fiberglass filters and with their more dense construction, they trap more dust. They contain electrostatic-charged, thermally bonded fiber and can be used to extend the life of HEPA filters. The downside to these filters is they won’t trap minute particles and bacteria.
Pleated filters (MERV ratings above 11)
These filters are a good choice for families with pets and people with chronic respiratory illnesses. This filter traps most of the pollen, dust, mold spores and other allergens. It is made of hypoallergenic material and is effective against mold, bacteria and mildew. It will only need to be changed every 3 months. They are slightly more expensive than the lower rated filters.
Carbon filters
These don’t have a MERV rating since they are used primarily for odor control. They will usually last for 3 months and are effective against smells from smoking, pets, cooking and new paint.
Electrostatic filters
Air movement through these filters creates a static charge that traps even tiny particles of dust. They are washable and consequently very cost effective, though the upfront cost is higher than other filters. They are available in various sizes and MERV ratings, but still may consume more blower power. They should be cleaned at least once a month.
Electronic filters
These are always connected to a power source and usually come with a pre-filter to collect the larger particles. The pre-filter should be washed at least monthly, but the main filter can go 6 months or more before cleaning is required. Electronic filters are the most expensive, but also the most efficient of all residential filters.
Keeping a clean air filter can prolong the life of your heating and cooling unit. Air filters should fit snuggly into the opening with the arrows pointing in the direction of air flow. Your heating/cooling unit and your family’s needs should determine the type of filter used.
This article was authored by David Holly. David is a civil engineer based out of Orlando, FL. When David is not working for his engineering company he likes to spend time researching information related to living more healthy at home. He has been writing and contributing content for FacemyerAC.com for the past 6 months as it pertains to in home air quality and enjoys sharing the information he researches on his Google+ account as well.
