Eat the repair, Duane. You'll never in 5 lifetimes recover the cost of a new system in gas savings. It's all smokes and mirrors and popsicles.
Plus, if you ever add on or want to heat a garage or something, you have the extra ass. All you do for now is change the fan speed.
I'd far rather have more furnace than I need than less or just enough. And to pay good money to go backwards? Come on, man.
