It's older than 12 years which is how long ago my wife moved in here. I just looked for myself and the heater coil is leaking in one place. Unfortunately that one place is a corner where the water can drip down onto some electrical stuff. And you can see that it actually has.
The guy had a lot of trouble figuring out exactly what air handler we have because the piece of paper that had been on it likely with a model # is gone. I do know that our house heats with an Aquatherm system and that the outside unit we had put in a couple years ago is a 3-ton (if that helps any)
If I can prevent that leak (slow drip) from dripping down onto the electrical stuff I might be able to buy some time by just replacing the blower wheel. Then wait until tax time to get the coil replaced.
“Most men lead lives of quiet desperation and go to the grave with the song still in them.” --Henry David Thoreau