My home split aircon's badly require service. One is Mitsubishi 18000btu bought in 2010, cooling is reduced and outdoor unit sounds like a ford tractor engine and other is General 24000btu i guess it is low on refrigerant and it has served with good 8yrs of service w/o gas recharge or service but mitsubishi needs service and gas recharge. Is their any expert for split ac in rawalpindi please suggest with contact number.