I am looking to install a zoning system in my home and have a few questions after receiving three different quotes.
House is 2 year old with unfinished basement, 2800 SF (1800 ML & 1000 2nd level)
Furnace - Lennox G51MP-48C-110-06
A/C - Lennox HS29-048-5P
Supply and returns are both 12"x20" and neck to 8"x20" at end of run.
I have all 6" duct off main trunk - 14 runs on main level and 6 on upper level. All upper level runs are 'squash' pipe to run up exterior wall. There is one louver register in the trunk line for the basement.
I am looking to install 3 or 4 zones - 2nd level, main level, basement and possibly the master bedroom, which is on the main level and includes 4 registers.
1) Install arzel zoning system in 4 zones and install bypass.
2) Would be best to install second system in attic for level 2 and could use 2 zone system for main level and basement.
3) Reconfigure and increase size of return trunk, add second supply trunk and zone trunks near furnace.
I do not like the cost associated with quote 2. What are your thoughts on the other 2 quotes? Will the arzel zoning system work adequately without lots of noise? Is the design of the existing system that poorly designed?
Thanks for any help!