This furnace has been out since 2009. It is different from their previous ones in that this one has a secondary burn (although one that does not look adequate to me) I am a bit surprised that there is so little information on this furnace in terms of its validity. There are no factory testimonials, (emailed the factory about this and received no answer) very little or next to nothing on the forums, no reviews. Either I'm looking in the wrong place (one would think if one googles "Energy King 385 reviews" one would get more than what shows up) or this furnace is not what it is cracked up to be. I get concerned when I see one on Craig's list for sale that is only one year old. You do not see many Blaze Kings for sale if at all. I know one guy here was not too pleased with his 385 but as everyone's situation is different, I would have like to have seen more on this furnace.