Maybe you should look into upgrading...

This year, along with all of the other economic peril to worry about, oil prices (used to heat the home in oil-based furnaces) are also expected to rise. Also, look at: http://greenecon.net/home-heating-concerns/energy_economics.html for more information about how these rising costs could affect you. Newer furnaces are more economical. The government has placed increased efficiency standards on most units and so they use less energy and fuel than in previous years. This can be especially helpful in saving money. Other options to ask about are geo-thermal heat models or the use of other fuels rather than gas or oil.