Mitch
Without them you can clog up vital parts of the heating or cooling components that can be difficult to clean out and can cause severe damage that will be much more expensive to repair than the inconvenience of replacing a filter once a month

jean ann j
Yes, they catch dirt that would go into the AC system that can do a lot of harm to the AC.

Claire
yes it's important

Hari charan
we feel so hot now-days we are feeling hot in the places like ooty also because of glbal warming so every house are using ar conditoners and also becomng the reason for global warmng which s creating the heat

deborah_dej
The air conditioner uses the fan on the furance.It kicks around the air from the squiral cage that stores debree from all the air ducting in the house.It's best to use a filter greater then marv 7 when using the air conditioner.

Dickens
Its a government conspiracy. they release a toxic gas that brainwashes you into liking the current government, not all the time otherwise you would know you were being brainwashed. That's why drug addicts who can't afford air conditioners are the only ones who always hate the government.

SpeakerMan
If you don't want to die from the Mold and mildew they filter then yes they are some what important

Tim
I also use air filters in my home. It's just a common practice here if you want to breath fresh air.

Daniel
It is very important to use air conditioner filters at home, especially in spring. Indoor pollution, as it has started to be called, is a big allergy causer. Many people make their homes air tight in the winter, and for good reason, to keep warm. Making your house airtight though has a down side. There is no fresh air circulating through your home, and the air is often polluted with dust, smoke and other containments. In the spring we often start opening windows and doors to let the air in and circulate in our "stale" homes. Now we are adding even more allergens into an already full house. Check your filters. Change them often. It is recommended that you change your furnace or air conditioning intake filter at least once a month. These filters filter out more of the allergy causing pollutants in the air of our home.