A condensing unit is a type of air conditioning system that uses a condenser to cool air. It is typically used in residential and commercial settings, and works by taking in warm air, cooling it, and then releasing the cooled air back into the environment. The condenser is the main component of the system, and it works by using a compressor to increase the pressure of the refrigerant gas, which causes it to become hot. The hot gas is then passed through a series of coils, which causes it to cool down and condense into a liquid. The liquid is then passed through an expansion valve, which reduces the pressure and causes the liquid to evaporate back into a gas. This gas is then passed through the evaporator coil, which absorbs the heat from the air and releases it outside. The cooled air is then circulated back into the environment. A condensing unit is an efficient and cost-effective way to cool air, and is a great option for those looking to reduce their energy bills.