A clean furnace filter can cut your heating bill by 5 to 15 percent. If you live in a cold area of the world, it is likely that the majority of your home-energy expenditure will go towards your furnace. Cleaning your furnace filter is an easy and cheap way of reducing your energy costs and improving your indoor air quality.
If you are running your furnace consistently throughout the winter, it is best if you inspect your heater's filter once a month. If you are still using disposable fiberglass filters, it is time for you to get a permanent filter. Fiberglass filters don't work as well reusable ones, and they are wasteful. A decent reusable filter can be purchased for under fifty dollars. That's worth the investment. You'll save money on filters and on the energy saved.