http://www.youtube.com/watch?v=KptFgTtl9Ok Check out this video guys. It presents a checklist of the various types of furnace problems, and what you can do to fix them. This way, you can save on expensive repair persons' fees, by doing things following the checklist. Once you exhaust the options, call the professional furnace repair experts. These guys fix furnaces on 24 hour emergency basis in Brampton, Mississauga, Bolton and adjoining areas! The video also has their contact information!