have, the type of filters you buy and how many people live in the house. having pets and having people who smoke or have allergies will also affect how often you change your filter. a good rule of thumb is to change your furnace filter every 60 – 90 days. check it after 60 days – if it looks dirty change it.
changing your furnace filter is one of the easiest things you can do around your house. refer to your furnace’s manual for exact instructions for your model, but for the most part it’s a simple as sliding the old one out and sliding the new one in. so do 