just bought samsung family hub
the cooling system is not the same as the problematic one
question is, how long i need to wait to turn on?

Yeah from the shopee seller recommended above. The delivery guys will give the printed receipt and warranty card. And yes-they do the installation too.

I help to answer, since i go through same process...
PH Store from either shopee or lazada. I bought mine and only delivered 2 months later after my renovation done. Seller may be reluctant, so u need self-declare that u understand & accept that warranty starts from the day of ur full payment.

Luckily i ordered early, its was during post MCO, after my order, the model i want was out of stock for almost half a year+ only see it in the market again

Stick with Jap brands to be safe. Panasonic is highly recommended. Sharp also ok. Hitachi got some questionable after sales issues recently. Mitsubishi too little feedback