Zone System

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  #1  
Old 05-25-17, 11:09 PM
T
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Zone System

Didn't want to hijack Desert's thread so....

We're also looking into replacing our system. It is zoned upper and lower. The upper is an open loft (stairs from the living room) and separate bedroom. The loft overlooks the (south side) living room/dining room (Which have 20' ceilings) The south side of our house is consistently warmer than the north side. The returns are at the top of the stair/entry to the loft. Additionally on the south side is a kitchen/family room (separated by a wall from LR/DR, 10' ceilings) . The north side of the house is all bedrooms. Hopefully that paints a picture.

As the air from the kitchen/FR needs to get sucked through a couple of doorways to get to the stair, what does anyone think of zoning the system north/south.

Or would adding a return in the Kitchen/FR be a better way to move the air?
 
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Old 05-26-17, 04:13 AM
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Returns are against code in kitchens and bathrooms.
IMO 2 story needs two systems. Zoned systems in residential rarely work like they are intended. If you have properly sized system with properly sized duct you will be comfortable with far less electric used than if you have a zoned system.
 
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Old 05-26-17, 11:27 AM
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The kitchen/FR is one big room ("open concept" lol). So putting one in the FR is still against code?

A number of years ago we had a few companies give us estimates for a new system (was having problems with contactors outside, which I wound fixing). The 3 prices were no where near each other. They did not do any load calcs. All of them indicated that the house would have had them done when the system was installed and they went off that.

When asking for bids, is it out of line to require a load calc to be done?

Lastly, if zone is no good for residential, any ideas on how to compensate for the sun on the south side heating up the house more than the north side?
 
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Old 05-26-17, 11:59 AM
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As long as the return is not in the kitchen it is fine. If they skimp on the load cal then they will skimp else ware its a good tool to weed out the jacklegs. A proper load cal will tell you how much air you need in each room. You can take that number and size the duct to each room accordingly. should be able to get each room on a floor to within 1-2 degrees of each other. now one unit doing muti levels is almost impossible to get the temp that close.
 
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