Still trying to sort through all my options as it seems I have yet to get the perfect quote ( not speaking of pricing mind you ). But, today's quote threw a curve to me as the installers seemed to do everything by the book, checking for leaks in my home, carefully building a heat load calc ( Manual J and D ) , etc etc and suggested many things no one else had done, including measuring the leakage around my existing vents and returns.
Their philosophy was ot get the ductwork done as perfect as one can and then worry about the equipment next as most other installers had gone fairly quickly to the equipment, even the other 2 who had done some level of heat load calcs. They also seemed less inclined to get into the higher end equipment unless the calculated cost payback demonstrates it is a worthwhile purchase.
Not all my quotes are back in but the last installer wants to use lined metal ductwork for the main trunk part of the system. I'm assuming their calculations via software is taking inot account the friction losses due to the lining as well as increaisng the duct sizing due to the lining thickness ( will verify this ). They said the liner they use has a mold preventative, etc added to it.
I have a few questions to ask them but was curious if a lined duct system ( for the trunk ) can be effective and if it can stand the test of time ( say 15 years ). I'm fairly ignorant of this type of insulation and aside from the obvious concern of fiberglass being able to blow throughout the system, I was curious as to how effective it can be, if done right. Also, how much insulation does one get if using 1 inch thick lined insulation.
Thx in advance. I'm close to making a decision and everyone's help here has helped me better evaluate each installer.