Now that it’s really hot and we are all using air conditioning 24/7, it’s more important than ever to change the filters every month. The filters don’t cost very much. If you want the high end filters, that are made specifically for people with severe allergies, those are more expensive. However, the disposal type of filters are as little as $5 each. Sometimes you can purchase them in packages of 3 or 5, lowering the cost even more. It only takes a few minutes to change the filter. That few minutes and few dollars will help your system operate at maximum efficiency and save money over all.