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Question DetailsAsked on 12/16/2013

We have been told that Mitsubitshi Mini Split heater/ac will work well in our 1200 sq ft glass enclosed patio. True

Will the mini splits heat/cool as quickly as a conventional gas furnace and refrigerated air unit? We are trying to avoid metal ductwork on the roof as there is an upstairs deck, and the ducts would be visible. I would like something cleaner than natural gas heat, but my husband does not want the expense of the electric units. The area is mostly glassed-in with laminated double pane glass. The walls under and between the glass are made of stucco. There are several large arches as wide as 16' above a 3.5-4' high wall. Neither the arch structures nor the wall is insulated. We are considering blowing foam insulation in these walls/arches.

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3 Answers


The only way to know what size is required is to have a Pro do a 'load Calculation". The industry standard for residential is a Manual J, from

Call the Pros on Angie's List and ask if they can do a Manual J load calculation. It can easily be done, to show the requirement with and without the insulation you mentioned. Always better to insulate to keep your operating costs down.


Answered 6 years ago by BayAreaAC


+1 to BayAreaAC.

Gotta do a manual J to be sure.

The Mini splits will certainly cool as effectively but the output temperature will not be as high as a gas fired furnace.

We have used them in sunroom additions and they comfortable heated and cooled the largest units that we made for our clients.

You certainly have a bunch of heat loss potential there with what you have from a construction standpoint but every little bit of improvement will help.

Dense packing the walls and making sure the windows are properly functioning will help keep the conditioned air in the home.

Answered 6 years ago by WoWHomeSolutions


you would need a 12000btu unit this would work well

Source: www.

Answered 4 years ago by koolray

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