stand alone central ac options?


Old 06-10-17, 09:29 PM
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stand alone central ac options?

new hear and need help (go figure).
I need to install central ac in a house with hydronic heat. I have a fresh air handler/dehumidifier that is whole house ducted.
If it is advisable I would be willing to remove the dehumidifier/air handler as the dehumidifier is seldom used as in almost never.
My main duct is 10" and all branch ducts are 4" to every room. Ducting is all attic run.
House is 1848 sq. ft. on a slab ranch style very well insulated.
any help is appreciated.
Old 06-10-17, 10:54 PM
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So will you be installing return ducting or continue to draw outdoor air?
Depending on what you mean by 10" duct, either flex, round or 10X10 metal, that's not good for much airflow. Less then 1 ton to be exact.
You'll need a load calculation for sizing.
Old 06-11-17, 07:11 AM
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my air handler is installed with a return duct. main ducts are 10" round.
the house was designed and built for low heat gain and to this point I have been able to maintain comfort with a single 8K btu window unit and running the house circulator.
Old 06-11-17, 08:28 AM
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Ducts that small probably won't work unless you use high velocity central A/C.
Old 06-12-17, 07:14 AM
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I agree that your air circulating system has nowhere near enough air volume to be able to have airconditioning added to it.
Unless you replace the circulator system with a much larger one, installing a mini-split airconditioner with two evaporator coils might be your most simple solution.

Not sure what your circulator system looks like but in commercial applications it is common to add a small airconditioner to an outside air supply that matches its air delivery to temper the air to reduce cooling requirements for permanent airconditioning.
Old 06-12-17, 09:56 AM
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10 inch duct, 390 cfm of air (1ton of cooling) for 1848 sq ft. Not going to cool it.

A guide and only a guide!!!! For residential only 600 sq ft per ton. Of course a heat load is 100% mandatory.

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