terumo

Only those flats with upgraded electrical loading (40 Amp) can apply for 2 condensors subject to HDB approval. If the loading is not upgraded, HDB will definitely reject the application.

Is your Mit Electric all 9k btu? or with a 18k?

Get Daikin ma56. Can match ur existing national units,

What brand is ur system 3?

Piping if no history of gas leak or water leak, most likely can use back. Dismantling usually is free.

3 hrs per day, I think non inverter is more suitable for u.

Use a rubber or 3m mat also can reduce the noise.

You can get any company to shift for u.

If u use non inverter, u have to get those with dual compressor. Like Panasonic. Then it will suits u as u use one room most of the time. But 2-3 years later, the amount of energy u use will be higher by 20-40% if u use 2 @ the same time, compared to inverter.

Keystone cable is top notch quality. If possible, use all Amraflex insulation.

Upgrade is necessary if ur piping is concealed above false ceiling or Inside L Box. In my views.

U referring to casement aircon?

4a38 can be used at hdb. But the outdoor unit is quite big, thus not very suitable for hdb ESP those outdoor mounted on brackets.

Ur flat have aircon ledge?

What brand u r looking @?