Wei Li Lee's List: aircon

Aircon just broke down. Compressor motor replacment will cost $400-$600.
 
 2 units blowing out hot air. (not gas technician just checked)(also been leaking for about 3-4years)
 
 1 unit in mbr still functioning as per normal.
 
 Since its already 10 years+ old was thinking of replacing all of them.
 
 Was previously using National(Panasonic) System 3.
 
 After reading through it seems the most favourable brands are Daikin/Mitsubishi/Panasonic
 
 1. Mitsubishi MXY-3A28VA / MSY-GE10VA x 3
 
 2. Panasonic CU-3S27MKZ / CS-S9KKZW X 3
 
 Leaning more towards the Mitsubishi not because of Jack Neo but because the National that i currently have kept giving me problems.
 
 info that i've compiled.
 
 2 kinds of refrigerant for inverters R22(older/top up cost $10?/not-eco friendly) and R410A(newer/top up cost $35?/eco friendly)
 
 the latter is used in the Mitsubishi Electric MXY-3A28VA / MSY-GE10VA x 3 system.
 
 9000btu is enough for hdb room size.
 
 16mm drainage pipe would be good but 13mm is sufficient.
 
 G23 Copper is good for pipings concealed in truckings.
 
 Class 0 or Class 1 insulation doesn't matter. Brands like Aramflex/Thermaflex is common and good to go. (don't save on insulation)
 
 >6 hrs daily, go for inverter. <6hrs daily, go for non-inverter
 
 Savings of about $100+/- a month.(if used daily >6 hrs)
 
 Lastly choose a reputable company.
 
 Seems like GainC**y isn't that favourable here.
 
 CoolS***e seems to be good but no installment plan?
 
 AllB**t getting mix reviews.
 
 BestT**h? not too sure about them.