Understand the principle before the equipment
The refrigeration cycle uses pressure changes and phase change to move heat. The refrigerant absorbs heat at a low pressure and temperature, then releases that heat at a higher pressure and temperature.
The compressor does not directly cool the home. It creates the pressure difference that allows the refrigerant to circulate through the cycle and reject absorbed heat outdoors.
The metering device separates the high-pressure and low-pressure sides and controls refrigerant feeding into the evaporator.