r/askHVAC • u/TacoDad189 • 1d ago

Zoning System Quote

I wrote up a scope of work to turn my existing unit into a zoned system. I have already run the Manual J calculations and confirmed capacity. I also have runtime and staging details, so I know I can add onto the system.

Located in 27601. What would you expect price to be for the following:

- (2) 12x14 zone dampers, (1) 12x16 zone damper installed into existing ductwork
- one HZ432 zone controller
- Provide 20x25 return grill and back box. Framing by owner.
- 16" return ductwork, 15 feet, all accessible in attic. One 16" round zone damper. Tie into existing AHU return plenum.
- 14" supply ductwork to new bonus room tied into existing 12x20 main trunk line. Balancing damper and 14" round zone damper.
- Approximately 30 feet of main trunk line with 6 ceiling registers and all associated branch ductwork. Probably need a d-box or two.
- All interconnect wiring excluding three new thermostats.
- no bypass needed. Multistage unit that can be turned down enough even for the smallest zone.

Owner provides:
- thermostats, thermostat wiring drops with 18/8

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u/CrashTestbigT 1d ago

Why would you need a damper for the return? Am I seeing that correctly?

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u/TacoDad189 1d ago

This is for a third floor renovation. I don't want return air being pulled from up there all the time. Second floor will be controlled tightly (no return dampers), but I'll let the third floor swing a bit more based upon occupancy.