It is that time of year that you really should make sure to check and replace your furnace filter ... a clean filter will make your furnace run much more efficiently. I change my regularly but am always amazed how dirty they get in this country. Yesterday I had one in a building that I am marketing that really jogged my memory to remind people .... it was absolutely filthy. They are out of sight and so naturally out of mind. While you are checking your furnace filter, take a look at your carbon monoxide detector. The life span is no more than 10 years. I confess mine was somewhat older when I got reminded to check mine! I immediately replaced it!