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Question DetailsAsked on 10/21/2013

What size A/C unit is needed for 1400 sq. ft. home"?

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2 Answers

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There is science that must be used to determine the correct size. It is Manual J and Manual S, from www.acca.org these are the industry standards insist on them when shopping around.


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Source: www.bayareacool.com

Answered 6 years ago by BayAreaAC

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To figure it correctly, as BayAreaCool said, requires calculations based on square footage of home, square footage of windows, sun exposure, local climatic cooling load, average insulation effectiveness in walls and attic, etc - VERY roughly about 400-600 SF per "ton" of cooling, so your size house would probably be in the 3 or maybe 4 ton (if in really hot area with full sun exposure) range.

You really need to get bidders to show you the calcs for needed system capacity, because undersizing will not cool as fast as you want and will overwork the unit, causing premature failurer, whereas oversizing can result in excessively cold airflow and freezing up of the system, result in damage or in extreme cases total destruction of the guts of the compressing unit.

Answered 6 years ago by LCD




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