"MiamiCuse" wrote in
:

I have two AC zones in my house one for the west wing and one for the
east wing. The west wing is a 4 ton cooling the living room, dinning
room, kitchen, laundry room, utility room, pantry, one bath and a
hallway. The east side is a 3.5 ton cooling 4 bedrooms, 3 baths and a
long hallway. In the middle connecting the east and west wing is a
family room which is about 32'x16' with the ceiling varying from 9' to
16' tall. This room has a fireplace and lots of glass doors and
windows that leads to the pool and it's never cool enough and it's at
the end of the AC supply for the east wing.

So I am thinking of capping off the supply for the family room and let
the other rooms get cooler and install a split ductless unit (like a
Mitsubishi Mr. Slim Series MXZ-2A20NA for example). I have calculated
I need 20,000 BTU. I don't think I will need a heat pump since I am
in Miami and I do have a fireplace in that room if I ever need it.

Questions a

(1) What are other brands I should consider?
(2) These unit needs an outside condenser too do they need to be floor
mounted on a concrete pad or they need to be wall mounted?
(3) Where should I place this unit on the inside? I assume it has to
be placed in the middle and as high as possible) but I have a tied
beam and a row of windows and glass door and the only spot is the
corner, but I am concerned putting it in the corner will cause uneven
distribution of the cooling, the AC guy who quoted me says it does not
matter air will flow evenly...really? Seems illogical to me if the
room is 32' long it will not cool evenly if it's mounted on one side
right?

Thanks,

MC




So I am thinking of capping off the supply for the family room

Something to keep in mind. I have a 25yrs in the business HVAC company
owner do work on any of these HUD wrecks I rebuild. In this particular
place now, a totally new system was installed. Told him I'd be shutting
vents in unused areas. Right away he said to be careful because the coil
is designed to have x number of cubic of air passing over it in a given
time, Anything less is not good. I failed to ask him if it was bad for
the unit and/or if it was an efficiency unit. My GUESS is both.

This particular 2-1/2t gas pack has 12 floor/low wall ducts. Ten are 6"
and two are 8" The two 8" plus a 6" were put in the room with a vaulted
15' ceiling. I believe he said I could close three 6" ducts but it may
have been only two. Anyway, I have two closed in one room I only use for
storage right now.