| A pipework component that allows refrigerant gas to be diverted. |
| A pipework component that only allows refrigerant gas to go one way through it. |
| An air conditioning unit that will cool, heat and control humidity. Generally used where control of humidity is required. |
| The part of a refrigeration/air conditioning system where the heat is rejected. |
| The heat gained in a room, i.e. the heat given out by computers and other office machinery, from the sun coming in the window (solar gain), people, etc. |
| A device that can transfer heat from one medium to another. In air conditioning this is done by reversing the direction of flow of the refrigerant. Heat is then taken from outside and rejected inside the building. Most modern heat pumps will provide heating with external ambient temperatures as cold as -15°c. |
| The amount of moisture in the air. The warmer the air the more water it can hold. |
| The part of the refrigeration/air conditioning system where the heat is absorbed. |
| The amount of heat absorbed or released by a substance undergoing a change of state, such as ice changing to water or water to steam, at constant temperature and pressure. |
| Unit mounted on wall at high level, one of the most common units. |
| Ceiling mounted unit, recessed into the ceiling void. |
| Ceiling mounted unit, suspended below the ceiling. |
| Unit mounted on the wall at floor level. |
| Unit mounted in a ceiling void, with ducts delivering conditioned air to the space being conditioned. |
| Self contained mobile unit, generally used for spot cooling. Requires a ventilation hose to outside. |
| An inverter is an electronic control device that can change the voltage being supplied to it. Inverter air conditioning units can speed up or slow down the compressor to regulate the cooling or heating produced to the heat load required. Subsequently, these use less electricity than conventional air conditioning units of the same size. |
| Larger types of air conditioning systems, generally used in commercial buildings where multiple rooms need individual air conditioning. Multiple indoor units can be run from one outdoor unit with one central pipework system. |
