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The Trane is quieter and easier to repair than the Lennox furnace. I work on both furnaces and the Trane is easier to troubleshoot than the Lennox. Yes you can hang furnace from rafters but it is more difficult to hang the Auxilary drain pan under furnace. The 90% is much quieter than the 80% furnace. The burners are enclosed making it quieter. Russ
8 am your time would be good just let me know. Russ
Installers hang the furnaces by metal straps from rafters. I prefer the furnace to set on a platform above drain pan. You only have to have one vent thru ceiling. A concentric vent can be used that has intake and exhaust in same pipe. Lennox has had problems with secondary heat exchangers in the past. Trane 90% and above have not had any problems. From a dealers standpoint the Trane has less problems than the Lennox.
If you do not have anymore questions about furnaces. Please rate answer. Good luck with your choice. Read reviews on Lennox furnace. Russ
Will be available anytime after 6 PM CDT this evening. Russ
On line now. If you have questions. Russ