Should I replace all the duct work in my *

[kashiragib]

I also like option 3
good one

[KristopherH]

Is it possible to just switch the cold air and heat near the furnace without having to rip out all the duct * Replacing all the duct work sounds expensive. We also have a crawl space under part of our house and live in cold Indiana. I don't think our floors are insulated but that sounds like a good idea.

[aircooledtx]

**"k9taxi":*'m heating with gas. I live in Salt Lake City, Utah. I have a Coleman Eschelon .C series 96% Efficient furnace sitting in the garage waiting to replace my old 85% efficient furnace. I have to decide soon if I'm going to replace the duct work. I'm also considering spending $3,400 to have 2" of insulation pumped into the air space between the bricks. Already have new double pane low-e windows installed everywhere. Also have the attic full of cellulose insulation.

The only options I have left are:

1) retrofit all the duct work
2) insulate the brick air gap
3) insulate the floors
4) move to some other state where it doesn't freeze in the winter

P.S. Option 4 is starting to look better all the time.*/quote:*
I would replace the ductwork if you can and design for new type heating and air conditioning. Replace that old Coleman if you have the money to Carrier Variable drv furnace..