I visited Gain City and purchased the following system 3 combination as salesman recommended Mitsubishi Electric MXY-3A28VA / 2 X MSY-GE10VA / MSY-GE24VA I'm owning a 4rm HDB, wondering if the GE24VA is too big for my living room. Plus, the unit is 1.1 meter long which I don't like. My dining area plus living is only about 20-25 sqm. Should I change the unit to 18VA only? I assume the number means or closely means to BTU, which should be enough for my living room, right? I don't have to install the big unit to overkill as well. Hope anyone has experience could advice. I would need to change quickly if needed as installation is happening next Monday.