It's getting cold out there, hopefully not inside your house. If so it is time to start thinking about what you are going to do about it. If you have a gas furnace you can call your utility provider and they should come and start it up without charge. If there are any serious issues they will alert you then you can decide whether to call a service company or to try to fix it yourself.
Most times a good cleaning will go a long way. Opening up the combustion chamber on an older furnace and cleaning it out with a shop vacuum does not take a technician. You can check for loose or burnt and corroded wires. Look for any evidence that the heat from combustion is where it is not supposed to be. If it is you can look for any obvious issues with your venting (rusty or perforated vent pipes or blocked or disconnected vents) if you do not see anything obvious you will probably want to call a pro here because you may have a failed heat exchanger and this could lead to cobustion product getting into your home.
If you have an electric system you will want to shut the power off and check every!! electrical connection inside the unit. Electric heat by it's very nature (wires getting hot) generates heat on the wires. This is made worse by loose or corroded connections which generate more heat. If you are successful DO It Yourselfer there are many places to get help if you have specific problems. Here are just a few,
http://forum.doityourself.com/forumdisplay.php?f=129
http://ths.gardenweb.com/forums/hvac/
http://www.bobvila.com/wwwboard/wwwboard.html
http://www.howtorepairairconditioners.com/homeowner-cries/fans-hvac-variable-speed-unit-furnace.html
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