This AC buying guide explains the most important factors you should check before purchasing an air conditioner in Pakistan. However, you should also check the cooling capacity listed in British Thermal Units, or BTUs. Decide Between Inverter and Non-Inverter ACAn inverter AC can adjust the compressor speed according to the room’s cooling requirement. Look for:Low-voltage startupWide-voltage operationSurge protectionOvervoltage protectionAutomatic restartCompressor protection delayDo not assume that every inverter AC can safely operate at very low voltage. Do Not Confuse an Inverter AC With a Solar ACThe term “DC inverter AC” refers to the technology used to control the compressor and motors.