Types of Air Conditioner Filters and How They Work

The part of an AC filter inside an HVAC system is essential. However, people don’t think a lot of the filters. However, there are different types of Air Conditioner Filters available in the market.

Most of the time, you get the air purifier installed with an HVAC professional. Therefore, you must have noticed the filters the Air Conditioner uses. 

Types of Air Conditioner Filters

Seemingly it merely appears as a sheet of cardboard or rigid cloth. However, AC filters, in many cases, are the very first and last point of protection to the indoor environment against harmful particulates.

Therefore, today we have come up with different types of Air Conditioner Filters. You can read about its types, Features, Pros and Cons as well.

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Types of Air Conditioner Filters 

The most common filters used in homes these days are:-

  • HEPA filters 
  • UV light filters 
  • Electrostatic filters 
  • Washable filters 
  • Media filters 
  • Spun glass filters 
  • Pleated filters 

Every one of these filters includes its own unique set of pros and cons. Although it varies based on your preferences for the machine. A few folks want HVAC system filters that’ll continue to keep the atmosphere free of pollutants. However, some others only require a simple filter to have the business finished. 

Preferences: Broadly speaking, high-efficiency filters, which are additionally cheap, are most useful for homes. However, other considerations include pets inside the house, and often the filters need to be replaced.

Material: The different types of Air Conditioner Filters are made up of different materials. However, Filters are rated with the Minimum Efficiency Reporting Value (MERV). It was developed by the American Society of Heating and Refrigerating and Air Conditioning Engineers (ASHRAE). 

Moreover, the ratings vary from 1 to 16. Besides, it also provides you with a sense of how well the filter may trap pollutants as it can be small as 0.3 microns as well as 10 microns.

Air Conditioner Filters 

Perhaps not many filters have been made the same. Therefore selecting the proper filter depends upon you and your choices. Additionally, should think about factors such as the price of these filters. 

How air purifier work

It’s sensible to talk to an HVAC professional before making any decisions concerning filters. Moreover, you can compare the essential advantages and disadvantages of each filter.

Let us look at each filter type and its particular characteristics. It will also help narrow down the different types, which could be a perfect fit for the house.

1. Hepa Filters

The U.S. Department of Health suggests High-efficiency particulate air (HEPA) filters. They can get rid of a minimum of 99.97percent of airborne pollutants, including mould spores and dust. Moreover, they remove even the littlest microns or airborne contaminants, including bacteria and tobacco.

HEPA AC Filter

People that suffer from allergies or other respiratory problems can avail themselves of it using a HEPA filter. Moreover, all these filters have to get corrected to match the particular HVAC method.

Hepa Filters: Advantages and Disadvantages:


  • This filter makes it perfect for capturing pollutants that are larger such as pet dander and pollen. 
  • All these filters will also be relatively cost-effective, and you don’t have to replace them for a long time.


  • While they are great at ridding the house of pollutants, you may still find a few pollutants. HEPA filters are somewhat helpless. 
  • Fumes, gasses and scents are too small for HEPA filters. 
  • It cannot remove tiny dirt pollutants and other things from the environment. Therefore, you cannot solely depend on it for a healthy environment.

2. UV Filters 

As the name implies, UV filters utilize short wave ultraviolet rays to kill viruses and bacteria. Moreover, UV filters are great for killing germs which may be hazardous for their health. For example, mould spores and dust particles.

Transform Oxygen: One potential threat of UV filters is they could convert oxygen to ozone, which is toxic for health. Even lower levels of ozone may cause coughing and chest pain. Moreover, high quantities of this often lead to worsening of existing respiratory diseases, such as asthma.

Eliminates Bacteria: Though UV filters are also all effective in eliminating germs and viruses. But they are much less efficient in screening against pollutants such as dust. Therefore, it became a part of a more extensive filtration mechanism, including HEPA filters.

Replacement: The UV light is invisible to your eye. Besides, the light-bulbs generally need to be replaced each year. Although it is based upon the model and HVAC process.

Advantages: The UV light used in these filters can kill rough pollutants like germs and mould. Therefore, it provides you with exemplary indoor air quality. Moreover, it assists in preventing diseases and respiratory disorders.

Disadvantages: In addition to being quite expensive, UV filters cannot rid the atmosphere of common pollutants, for example, dust particles. Besides, they are also ineffective against fumes and smoke.

3) Electrostatic Filters

It consists of small paper and cotton fibres. Electrostatic filters make static behaves like a magnet for dust and other airborne particles. Moreover, the magnetism is strong enough to prevent particles all through your home. Also, it makes it the most effective choice for anyone that demands a filter that may combat allergens.

Electrostatic AC Filter

Reusable: An additional bonus to get electrostatic filters is that they can be disposed of in addition to reusability. If it is time to modify the filters, then you can choose to wash and reuse them.

Electrostatic Filters: Advantages and Disadvantages  


  • It is your choice if you pick the reusable or disposable option. All these filters are a few of the cheapest options available on the marketplace. 
  • Besides, it is possible to save yourself money without worrying about buying replacements.

Disadvantages: The electrostatic filters are a terrible option for folks who have respiratory troubles.

4) Washable Filters

Washable filters are environmentally friendly filters to help conserve money. The initial cost with the air filter type to HVAC systems is high. However, it should be looked at as an investment that may endure for all decades. 

Washable AC Filter
  • Saves Money: You can easily wash and reuse the filter again rather than purchasing new ones every couple of months.
  • Proper Maintenance: Washable filters need proper care and maintenance. You will have to wash it once in a while and make sure to dry it properly. Although it saves you money, you will have to put in some efforts to maintain it. 
  • Dry It Properly: It’s quite critical to guarantee that the filter is fully dry before putting it in. The moisture can result in mould growing in the filter. Moreover, it can release it into the air again.
  • MERV Score: When these filters have a minimal MERV score, they’re a fantastic long term investment. Moreover, it is suitable for people who do not always have strong preferences for HVAC filter types. 

Washable Filters: Advantages and Disadvantages


  • The ideal thing about a washable filter would be that you have to buy it once. And it’ll probably endure for the life length of one’s HVAC process.


  • For washable filters to keep on doing their job, you will have to wash them within regular intervals. 
  • Remove the filter and allow it dry thoroughly before reinserting it. 
  • The moist or wet filter may grow mould and mildew, and it may cause damage to air quality.

5. Media Filters 

Media Filters also work in regards to the HVAC systems. Therefore, Media filters may offer more benefits than conventional filters. However, Media filters offer an identical degree of filtration for being a high-MERV filter.

Media AC Filter

Improved Filtration: Moreover, they take action with no unwanted effects of static or airflow pressure. As an alternative, media filters possess a larger surface area. And it also prevents significant static disturbance whilst providing improved filtration.

Economical and Low Maintenance: Media filters are super simple to keep and perfect for filtering bacteria along with various small airborne pollutants. Also, the dirt settles inside the filter, so preventing it from getting thrown into your house. Moreover, Media filters will also be hardy and economical, having to be replaced as rarely as once or twice annually.

Media Filters Advantages and Disadvantages:


  • These filters are famous because of their low maintenance 
  • Moreover, you don’t have to worry about changing it quite often. 
  • They indeed are excellent at cleaning as a result of their high surface area.
  • Besides, it traps pollutants instead of sending them straight into the atmosphere.


Media filters create a foul smell, thereby making it difficult for people sometimes. However, they are one of the different types of Air Conditioner Filters to use indoors. 

6. Spun Glass Filters:

Strands of ceramic have been summoned together to generate this kind of filter. Moreover, it is one of the useful HVAC filters. And it creates a few of the ideal Types of Air Conditioner AC Filters. Also, it’s inexpensive, disposable. Besides, it protects air conditioners and removes dirt and allergens.

Spun Glass Filter

Spun Glass if one of the different kinds of AC filters readily available. However, if you are seeking an air purifier, then you should use some other filter or purifier. 

These filters are not famous for improving air quality as they cannot improve quality significantly. Besides, it could merely snare some allergens and dust. Because of this, these filters are not suggested for folks who have respiratory issues. Therefore, you should buy a filter that’ll enhance indoor air quality.

Spun Glass: Advantages and Disadvantages


Spun Glass Filters are the most economical ones available in the market. Moreover, the Spun glass filters are exemplary in filtering dust and lint.


  • Due to the glass filters having a more extensive area, they’re inefficient in filtering smaller pollutants. 
  • Bad option for people who have allergies and other respiratory problems. 
  • They also pose the chance to get clogged and negatively affecting airflow. As you can not clean the filter quite often, the dust settles inside.

7. Pleated Filters:

Polyester cotton or fabrics springs are just two HVAC filter substances utilized in pleated filters. At the same time, they could effortlessly filter dust and other airborne pollutants. Moreover, they provide low oxygen filtration and also tend to be far resistant to air.

Pleated AC Filter
  • Reusable: Even the pleats in those filters provide them with a bonus within non-pleated options because they increase the filter surface for filtering. Besides, Pleated filters are easily disposable and reusable. Besides, it helps to suppress the noise of this HVAC fan.

They might require your HVAC system to work somewhat more challenging to pull air through the machine. Therefore, it might lead to your HVAC system losing efficacy before its anticipation. 

Pleated filters enhance the overall air quality of the household marginally. Also, they indeed are a viable solution for the home.

Pleated Filter Advantages and Disadvantages


  • The most useful options in regards to trapping dust
  • Pleated filters will also be exemplary at trapping the significant pollutants as a result of their larger surface. 
  • These filters additionally go longer. They require fewer replacements and also the used filters that you can recycle.


The single drawback to these filters is the cost. They indeed are a few of the costlier options available on the marketplace. But, they are also an excellent solution to have your money’s worth indeed.

How do Air conditioners Filters work?

The air conditioner delivers cool air through ductwork inside your home in a central heating and cooling system. For this, it uses a mechanism that pulls warm air inside and removes its heat.

The compressor condenses and circulates the refrigerant through the outdoor unit in a split device. Besides, it converts it from a gas to a liquid. The liquid is then pushed through the cooling compartment or indoor evaporator coil. The fan in the indoor unit circulates the air inside the unit. And it allows it to pass through the evaporator fins.

The metal fins of the evaporator share thermal energy with the air around it. Besides, the air filter converts the liquid to vapor at this stage. Also it  removes any heat from the surrounding air. The air is cooled and blown back into the room when the heat is extracted from it.

The condenser or outdoor device then converts the vapor back to a liquid, thereby eliminating any heat. The fluid is a cold, low-pressure gas as it exits the evaporator. And it finally returns to the condenser to begin the process all over again.

This cycle repeats until your room gets the desired cooling temperature. It is pre-programmed and sensed by your thermostat setting.

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