Is this a good furance? I have a pretty old one currently a 35 year old Luxiaire. A couple guys have said it is likely only 60% efficent anymore. But my heat/electric bill is only $150/$175 in the winter. Would it be worth it to replace it with the Carrier 59TP5? Don't know if I would save much money despite it being 95% efficent. Also can anyone tell me any reviews on this model? I tried looking and really could not find much on it. Price wise I was given a good price by one of the large HVAC businesses in my city. I am mostly concered that I won't get my money out of this and if it is reliabie.