An expansion valve is a device used in refrigeration and air conditioning systems to regulate the flow of refrigerant. Its main function is to reduce the pressure of the refrigerant, which causes it to expand and evaporate, thus cooling the surrounding area.

A bracket for a ductless unit is a support that is used to mount a ductless mini-split air conditioning unit or heat pump on a wall or other structure. The bracket is typically made of metal and is designed to securely hold the weight of the unit in place.

Refrigeration is the process of transferring heat from a space or substance to another place to reduce the temperature and keep it at a lower level.
This is accomplished by removing heat from one area through a process of evaporation or compression and then releasing that heat in another area.

Expansion valves are critical components in air conditioning systems that use refrigerants to cool the air.