Relocation fee la

yes, certain aircond has a feedback sensor cable to the compressor and there will be 4 cables, if it is not done during installation, you might need to hack the wall and get the cables out and put in another cable

so best way is to find the feedback sensor from indoor unit only such as Panasonic or Daikin

for your living room, you can still go for 2.5hp, but the installer must know how to connect the copper hose to the smaller concealed hose

If the piping are new, you can always use R410A in R22 piping, the problem will not arise immediately, it will take a few years before the pipe burst and you can change new piping by then

The problem is R410A has higher pressure gas comparing with R22 thus it will make the piping crack if the wall of the pipe is less than 0.6mm.

If you cut the insulator out, you can see the thickness of the copper pipe printed on. Best is check it yourself

sure

No

most likely your flaring side has leak

I also experienced this when they installed my aircond, the flare has minor leak

at beginning, the aircond was cold, but with the minor leak, i am loosing the gas and after 2 weeks, it wasn't cold anymore

the panasonic guys came and check and found minor leak on the flare, then i called my installed to redo the flare, now it's normal again, very cold on 23c