**"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 -
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.*/-*
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..