Most of the major furnace brands are made by the same two groups: Lennox and Carrrier. Not alot of difference out there. As for Installers, both big makers have bought out the major installers hence they only sell one brand or the other. Price quotes are curiously competitive with the big installers. Look to the little installers for price competition.
Your house now has to go to the high efficiency furnaces, as mid efficiency were discontinued last year, and stock likely is sold out now on the mid efficiency furnaces. There will be a power vent retrofit needed for air / exhaust supply, assuming you have make up air already in the furnace room. You may as well upgrade the hot water tank at this time as well to a power vent system when you have the guys on site doing the retrofits. Hot water tanks draw alot of gas and the new ones are really good for efficiency, ove r what you likely have.
As for DC drives, most already are when they are high efficiency, but the variable speed furnaces arguably don't add alot for the extra price over the fixed speed furnaces. AYork TG9 (built by Johnson Controls) is rated 95 % efficiency, and I am happy with mine.
Drewski
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