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Question DetailsAsked on 8/27/2017

what size of mini split wall mounted ac for 500 sq. ft. room

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A proper ACCA Manual J calculation would have to be done to properly calculate the cooling load for your climatic location, solar energy gain through windows, energy efficiency/insulation of your house, considering how many rooms you have, and considering the volume (not just the square footage) of the room - but generally about 400-500 SF per ton of cooling for areas needing A/C for general cooling.

For a single room, if this is in addition to cooling from another unit in the rest of the house, might be 3/4 ton would be adequate if no major sun exposure through windows, because presumably at lewast 2 walls would be shared with conditiuoned space, not outdoor space. If instead, a peninsular room like a teed-out sunroom, might run from around 1 ton to as much as 2-3 tones for a room with an great deal of glass or poorly insulated walls. Those sort of considerations are why a proper calculation fo the demand which the unit will have to meet should be done, not just rule-of-thumbing the number.

Answered 3 years ago by LCD

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