Homeowners and renters are always encouraged to change out their heaters' air filters at least once a month. If they have a permanent filter, it needs to be rinsed out and dried every month also. Right now, it is also very important to check those filters more often if you live in an area such as our's where it has been so dry this season. You may need to change it more frequently than monthly. There is so much dust floating in our area since we have no moisture to keep it where it belongs. By doing this, you will help your heater to run more efficiently and may help people in your home who suffer with allergies and asthma. The allergens just continue to build up in your filters and are then transmitted into the air we breathe.