Just curious, who has manufactured the residential furnace with the highest
efficiency, to date, in North America?
Two points for the correct answer, opinions and or facts welcome.
Thought this may be interesting.
(shout out to Abby Normal whereever you are)
So far I've heard of several by American Standard & Goodman
[I think] to be 98% efficient. But that's an AFUE rating which takes
electrical usage into account.
But, there has been designs that used a fuel powered generator, that
provided electrical and heat.. which was touted as being high in efficiency.
But I haven't heard anything on that one in a long time.
Originally a condensing furnace design was from the early 1950's but fuel
being cheap, it wasn't popular because of price [stainless steel heat
exchanger.] I don't recal reading how "efficient" it was though.
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