Furnace filters must be changed on regular basis for healthy air quality. If the air in your house doesn’t seem up to snuff, there is a need of changing furnace filter. By changing furnace filter once in a three month you can breathe easier and save wear and tear on your furnace. To get the job done, you have to follow the simple tips given by the experts.

To change disposable filter

The filter might be inside the air vent return or inside the furnace. There is typically a marking on the filter indicating the airflow direction, which must be toward the furnace. You have to transfer this marking to a flat surface, you can use permanent marker so that you will be able to know the right way to install the filter. Write down the size and buy new ones from hardware store or HVAC supplier. You should look for the markings that tell you which side of the filter should face the furnace. Slide the filter back into the place and you can use any cover that goes over it.

To change fiberglass filter

First, you have to locate your filter, some will be located in the front, some in the back, and some located in the bottom. However, if you are not able to find the location of your furnace filter, you can use user’s manual for the location. Mostly fiber glass filters are of blue color, if it is any other color, then it’s a time to change the filters. If you have white filter, hold it up to the light and if you can’t see the light passing through it, then it’s time to change it.


If you just want to protect blower motor from dirt, then you can go the least expensive options available that costs around 2 dollar. However, if you are conscious about the air free of pollutants you can choose a fiberglass filters that costs around 10 to 15 dollars. Now you can change the filter, pull the dirty filter out and replace it with new one. You have to keep in mind that arrow on the filter in pointing towards the blowing motor.