It's nearing the end of a hot summer , which means your home's air conditioning unit has been cranking out cool air for a few months. All of that air circulation means your air filter is probably dirty and ready for a change! Cool Katie has created a 3 minute tutorial on how to change your home's air filter, and it's much easier than you think! While each home has a different style of unit, the general idea is the same. Simply locate your unit, discover what size and type of air filter you need, purchase a new filter, and change the old one out! Some homes will require tools for a proper filter change, like in this video, but others will not! Good luck and stay cool!