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01/31/2013 03:31 PM by name withheld; gas furnace economics

I have spent about $1000 in parts since 1992 maintaining my own 1982 gas furnace. The life of such a furnace is about 24 +/- 3 years.
Furnace maintenance contracts are about $500/year and a new furnace would be about $3000.

Given the money I have saved by doing my own maintenance, should I keep this furnace? A new furnace will have a computer and so will be unrepairable by me.

How should I attack this problem?
TIA [Manage messages]