Our gas utility is giving rebates for buying a greater than 92% efficient
furnace. There's also a tax credit available. These greatly reduce the
premium for buying such a unit and then of course there is the savings in
gas.

On the other hand, are these machines more prone to problems and need of
repairs than a simpler furnace? That could wipe everything out. Plus it
might be beyond my abilities to repair. The old furnace (see other thread)
I could do most maintenance. I was even able to solve a problem that
stumped a pro many years ago. (Not his fault...it just didn't act up when
he came.)

I know the pros of the super efficient furnaces. What are the cons? The
ones being considered are Carrier Performance Series. What are HVAC techs
putting in their own homes?