Thank you so much for explanation.
My parents looking at 4G33VA2 with 1x 12k BTU 3x 9k BTU which was promoted by the salesman .
seems like we need to look at 4G38VA2.
Home is 4 bedroom kind so all 4 units will be for rooms
Of course salesman will push and quote that the 4G33 is enough because the condenser will "push to max BTU" during the cooling phase. That ties in to the 4G33 being much cheaper to the 4G38, which will add to the likelihood of closing the sale with the customer.
Very unlikely any of them will show you the breakdown for your specific setup based on rated cooling capacity - where bold indicates FCU operating at rated capacity;
4G33VA2 w/ 1x FN13, 3x FN10 performance:
BR only:
9.5K
MBR only:
11.9K
BR + BR:
9.5K + 9.5K
MBR + BR: 11.1K + 8.9K
BR + BR + BR: 7.0K + 7.0K + 7.0K
MBR + BR + BR: 8.1K + 6.5K + 6.5K
MBR + BR + BR + BR: 6.2K + 4.9K + 4.9K + 4.9K
4G38VA2 w/ 1x FN13, 3x FN10 performance:
BR only:
9.5K
MBR only:
11.9K
BR + BR:
9.5K + 9.5K
MBR + BR:
11.9K + 9.5K
BR + BR + BR: 7.9K + 7.9K + 7.9K
MBR + BR + BR: 9.1K + 7.3K + 7.3K
MBR + BR + BR + BR: 7.0K + 5.6K + 5.6K + 5.6K
And what no online media will tell you is that Starmex's 5-tick range is essentially the old 2-tick range being given a handicap in order to achieve said efficiency;
4A38VA w/ 1x GE13, 3x GE10 performance:
BR only:
8.5K
MBR only:
11.9K
BR + BR:
8.5K + 8.5K
MBR + BR:
11.9K + 8.5K
BR + BR + BR:
8.5K + 8.5K + 8.5K
MBR + BR + BR:
11.9K + 8.5K +8.5K
MBR + BR + BR + BR: 9.9K + 7.1K + 7.1K + 7.1K