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Topic	PSA: Your AC can probably only handle lowering your living area 20 degrees
chrono625 07/22/19 6:43:20 AM #42:	IdiotMachine posted... @chrono625 posted... 500sqft per ton is rule of thumb for HVAC sizing. For 6500sqft, yeah 5 ton isn't able to handle that. You should realistically have two 5 ton units for the entire house. So the HVAC guy recommended getting at least a 7-ton light commercial unit, because getting two units will involve resizing ducts, zoning, etc. (he explained it to me in more details, but I forgot now). I talked to an HVAC friend, and he said don't do that, just get a second 3-ton split ductless unit installed in my first floor (the entire first floor is an "open concept", with vaulted ceilings and ~2,000 sqft of open space). What do you think about that...? That would be fine as long as you have a proper means to circulate the air in that amount of space and also it would have to be mounted higher than normal because cold air drops. If you have it too low the further points of the house to the unit will barely cool. What may also work are 2 splits located at each end of the first floor to assure you have proper coverage. Another idea is to install a second unit and a damper if there is a split in the supply between upstairs and downstairs. Again I have zero idea how the duct was run, I just installed a 2.5 ton unit in my home because I had a single zone that was only 3.5 tons for 2500sqft. The new unit takes care of my 2nd floor and is a complete game changer. I should also be more efficient in my energy usage now. --- https://imgur.com/Rqk1DYV - Super Bowl XXI/XXV/XLII/XLVI Champions - NY Giants Eli Manning SB tracker: 2/2 Superbowls 2/2 SBMVP's <cite>chrono625 posted [p:925017774] in PSA: Your ... [t:77877659]...</cite> <quote><cite>IdiotMachine posted...</cite> <quote><cite>@chrono625 posted...</cite> <quote>500sqft per ton is rule of thumb for HVAC sizing. For 6500sqft, yeah 5 ton isn't able to handle that. You should realistically have two 5 ton units for the entire house.</quote> So the HVAC guy recommended getting at least a 7-ton light commercial unit, because getting two units will involve resizing ducts, zoning, etc. (he explained it to me in more details, but I forgot now). I talked to an HVAC friend, and he said don't do that, just get a second 3-ton split ductless unit installed in my first floor (the entire first floor is an "open concept", with vaulted ceilings and ~2,000 sqft of open space). What do you think about that...?</quote> That would be fine as long as you have a proper means to circulate the air in that amount of space and also it would have to be mounted higher than normal because cold air drops. If you have it too low the further points of the house to the unit will barely cool. What may also work are 2 splits located at each end of the first floor to assure you have proper coverage. Another idea is to install a second unit and a damper if there is a split in the supply between upstairs and downstairs. Again I have zero idea how the duct was run, I just installed a 2.5 ton unit in my home because I had a single zone that was only 3.5 tons for 2500sqft. The new unit takes care of my 2nd floor and is a complete game changer. I should also be more efficient in my energy usage now. --- https://imgur.com/Rqk1DYV - Super Bowl XXI/XXV/XLII/XLVI Champions - NY Giants Eli Manning SB tracker: 2/2 Superbowls 2/2 SBMVP's</quote> ... Copied to Clipboard!
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