Locating a Minisplit Head Near HVAC Ducts
I’m seeking some input/support for a project I’m undertaking. I have a bonus room above 3 car garage (~312 sf) where I want to add a ductless mini split. Room has been retrofitted with spray foam insulation (floor, knee wall, ceiling) but is still not comfortable in winter and summer. I’ve attached a drawing. My preferred placement of the head unit is on the interior wall (door wall) as it provides the best routing for the line-set (in terms of least bends/turns and least opening of walls/floors to install) to my preferred location for outdoor unit which is rear exterior of house). Other options would either require lots on bend & turns and/or routing the line-set on front-facing exterior wall(s) of house which is aesthetically undesirable. On the interior door wall there is a cold air return duct about 7′ high. My questions are 1) could I mount a wall head where cold air return is and move cold air return down the wall vertically close to floor (I don’t mind that this wall would not be useable for furniture, etc) or 2) could I mount a floor head below the cold air duct. My concern is loss of heat/cooling from the unit being drawn into cold air return. Many thanks for any input.
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