Hi gurus,

I just came across this and would like to seek advise from all the experts here.

I am looking a Daikin ismile eco series for my new 5 room BTO (haven't received the key yet).

Below are the room dimensions, calculated BTU using the calculator (poor / very sunny / hot settings) & quoted aircon

1) Compressor -> MKM85VVGM (25.2K BTU)

Note: MKM100VVGM (29.4K BTU) is not considered as it might not fit through HDB window. Is this true?

2) MB (5000 x 3100 = 15.5 sqm) at 8,188 cal. BTU -> CTKM35VVMG (12K BTU)

3) Room #1 (3900 x 2900 = 11.31 sqm) at 7,045 cal. BTU -> CTKM25VVMG (9K BTU)

4) Room #2 (3900 x 2900 = 11.31 sqm) at 7,045 cal. BTU -> CTKM25VVMG (9K BTU)

5) Living & Dinning Room (5775 x 5625 + 3900 x 2825 = 43.5 sqm) at 16,825 cal. BTU -> CTKM71VVMG (24K BTU)

At night, if aircons in all three rooms are turned on, indoor BTU is 30K BTU which is higher than MKM85VVGM and MKM100VVGM can support. So the rooms will take longer time to cool and it will be not good for compressor in long run (true?).

At day, I guess aircons in the living room and 2 bedrooms at max will be turned on.

This will mean indoor BTU ranges from 42K to 45K BTU, which is significant higher than the outdoor BTU.

Based on the Daikin eco series brochure and the jexaircon link provided on the last post in pg. 332 earlier (unable to post link, sorry), MKM85VVGM is designed to support up to 4 rooms at 36.2K BTU (when running at max capacity).

I understand the concept of sum of indoor BTU must be equal or higher than outdoor BTU and compressor being under-capacity isn't good in the long run, based on what I read in this thread.

Can you advise me if the proposed aircon system is good enough, just need to manage when and which aircons to turn on?

Or should I look at alternative combinations, example like below?

Will installing 2 systems be overkill?

- 1 system: 1x MKM100VVGM (29.4K BTU) + 2x MKM85VVGM (25.2K BTU) + 1x CTKM35VVMG (12K BTU), if compressor can fit through HDB window
- 2 systems: 1x MKM85VVGM (25.2K BTU) + 1x CTKM71VVMG (24K BTU) & 1x MKM85VVGM (25.2K BTU) + 2x CTKM25VVMG (9K BTU) + 1x MKM85VVGM (25.2K BTU) (12K BTU)
- 2 systems: 1x MKM85VVGM (25.2K BTU) + 1x CTKM71VVMG (24K BTU) & 1x MKM75VVGM (20.5K BTU) + 3x CTKM25VVMG (9K BTU)

Thanks in advance!

Han