I'm getting a quote to replace an ineffective thru-wall A/C with a mini-split system (heating/cooling) in my living room. Based on research, I was expecting them to size the unit at 9,000 or 12,000 BTUs given the room size, but they instead sized at 18,000 which is enough to cover a "room" the size of the whole house. (Here is a link to a picture of the floor plan with the indoor unit proposed location marked in red: http://i.imgur.com/jRMcDou.jpg. Entire home is approx 850 sq ft on one level).
My understanding was that these units would not be able to pull air from the far reaches of the house and I'm concerned that I'll have a slightly better version of what I have now: one cool room and the rest uncomfortable. The seller (reputable and well-known, with a price to match) acknowledged this but says that due to the long slow cycles "the thermal mass of adjacent rooms will come close in temperature." Is that right? Sounds good on paper, but I'm worried that's not the actual experience. Although it's insulated, it's not a super air tight home.
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