Ace Hardware stores in the Rocky Mountain region are offering a coupon for a free furnace filter! You can print the coupon here and get a list of participating stores on that page, as well. The promotion is being offered to encourage people to change their filter since it’s likely quite dirty because of the smoke that was in the air over the summer.
Be sure to check what kind of filter you need before you head to the store – last year I headed to the store to buy a new filter and was a little shocked at all the different sizes they had! I had no clue what size we needed, so of course I had to put it off until the next shopping trip. :/