I happily had several window units cooling my bedrooms and living room in my house- kept the livable areas very nice even in 100 degree weather.
But since my son started walking I see the reasoning behind whole house A/C- it's just problematic going from room to room closing doors. I also have a problem that my townhouse has no overhang on the back roof and we had troubling water issues that mean I close those windows tight in the summer. I don't want to install air ducts throughout the house. I have a flat roof that would support an AC unit. I have a small crawlspace between ceiling and roof.
Is it feasible and cost efficient to look into some kind of roof-mounted AC unit with ducts leading from roof to the 2nd floor ceilings? I have a 25k btu window unit on my first floor which behaves flawlessly as far as I'm concerned and cools the whole downstairs, but a similar unit would not work so well upstairs with individual rooms.
Has anyone seen an installation like this? Is it worth pursuing?
Neighbors installed air ducts and they just cut into the living space too much.