Guys,

Need some serious help here pertaining to the aircon units.

I am having some headaches deciding the units typically the HP requirements for my house especially the Ground Floor common area due to having a double volume ceiling clearance about 6.7m after finishing.
Base on BTU calculations, I deduce roughly require more than 70000BTU??!!
The issue here is base on which ceiling level should I input to deduce?
For the rest of the ceiling height is roughly 2.8 - 3m finishing.
I have attached the floor plan with aircon location and HP indicated.
Can anyone advise if the aircon unit(s) proposed HP is sufficient to provide for the house base on experience?

Thanks a million.
Rgds,
Brendon