Been doing some research and could use the help of the experts on a couple of things. I had 5 HVAC companies come to my house for estimates on replacing my 50 year old 90,000 btu furnace for my 1500 sq. ft. ranch in N.W. OH. The estimates where similar in terms of cost for most, so I am going with the installer that I trust the most and received good feedback on from references ( BTW - none of the installers did a manual J calc, most where just concerned with how to get the exhaust out). My questions for the group are these.
1) Do I go with a Trane or Armstrong, both are the 90 plus percent efficient, but the Trane cost an extra $425. What does an extra 425 get me? 2) The contractor I am going with recommended a flue liner for $210 for the hot water heater exhaust. Is that necessary/recommended, would it be better to skip the liner and route the water heater exhaust throught the same PVC that is being run out the roof for the furnace ( the furnace and water heater are next to one another) 3) Is it ok to run the PVC exhaust through an unheated garage to the roof. It will be hugging the wall, but do I need to insulate the pipe? 4) One installer recommended replacing the coil, while this guy said to wait. Why would I replace the coil, is it recommended? 5) As far as sizing, all the contractors quoted something different. The guy I trust the most said 60,000 btu but I had others that recommended 90,000. What are the implications of undersizing/ oversizing. Is a manual J calc absolutely necessary or is a trained eye who is familiar with the neighborhood construction able to tell from experience. Any feedback is appreciated.- posted
16 years ago