Iwas sa samsung and idec brands since sirain talaga mga aircon nila. Pati kolin na non-inverter sirain but inverter units are ok.
Panasonic lately has more lemon units acdg to a friend who had 2 lemons out of 3 pana units. Pinalitan nya ng LG and he's happy with LG
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gut feeling: bad installer lng ng mga copper pipes or wala grounding...