Hi, This is my first time buying aircon for my new HDB flat. I got this quote from KxxSxxx for Mitsubishi Electric System 4 Inverter for 3 bedroom + 1 mini study room. 1) Compressor MXY4A28VA (28,000 btu) 2) Fancoil MSYGE10VA x 4 (9,000 btu) 3) 1/2" Insulflex class 1 insulation 4) 23 SWG copper piping 5) 16mm drainage piping Warranty: 5 yrs workmanship, 5 yrs compressor & 1 yr spare parts Total damage: $3,360 nett Is the quote ok? I think Armaflex insulation is more popular. Anybody uses Insulflex before? Should I upgrade to class 0 insulation instead? Think class 1 or 0 is referring to the fire rating of the insulation right?