Types of Air Conditioner Filters
Not all filters are made equal and your choice can make a big difference to the quality of your home's air. Here at Metropolitan, we are familiar with all types of air filters:
A High Efficiency Particulate Air, or HEPA filter, is placed on the return air grille of ducted air conditioning systems. They are arguably one of the most effective filters for improving air quality.
HEPA filters can purify your air from mould, bacteria, dust and more. This makes these filters a great option for those who suffer from respiratory problems or allergies.
HEPA filters need to be replaced every few years or so in residential settings and more frequently if it is used a lot.
As the name implies, UV filters use ultraviolet light to kill bacteria, viruses and mould spores. These filters use a UV lamp set to a germicidal wavelength to very effectively purify your HVAC air by destroying harmful microorganisms.
While effective against this, UV filters aren't useful at removing common allergens such as dust. They're also considerably more costly to install. The UV radiation used can also react with oxygen to form ozone which can be hazardous. They're often found in combination with HEPA filters to form a large and very effective filtration system.
The UV lamps typically need to be replaced every 12 months, depending on the brand and model.
An electrostatic filter uses paper and cotton fibres to capture dust and other particles through the natural magnetism of these materials. These are a great option for those who want to combat airborne allergens in a more cost-effective way.
You can find reusable and disposable electrostatic air filters so when it comes time to change your filters, you can decide whether to wash or replace them. When compared to other filters, however, electrostatic filters are not as effective at removing larger pollutants and may not be effective enough for asthma sufferers.
For the environmentally conscious, washable air filters are a great way to go. This filter material means you can simply wash it and reuse the filter over and over again.
While not as effective as other filters, these are great for homes where air quality isn't a major concern. In order to keep reusing these filters, you need to follow the instructions so they continue to work as intended.
Spun Glass Filters
One of the most common air con filters is spun glass filters. These are a cost-effective and readily available filter used in many air conditioners.
Spun glass filters aren't the most effective at removing airborne contaminants and can quickly become clogged which can negatively impact your air con's airflow and efficiency.
You can find cotton or polyester pleated filters. This air filter type is exceptional at capturing debris but not so good at providing air filtration. They're also a great option if you want to dampen the sound of your air con!
The nature of pleated filters, however, means that your air conditioner needs to work harder to pull air through the unit and so can make it less efficient.
Pleated filters are on the more affordable range of air filters and so are a good option for those concerned about their air quality but don't suffer and major respiratory illnesses. You can find reusable and disposable pleated filters too.