Celsius is a metric temperature scale where water freezes at 0 degrees and boils at 100 degrees under standard atmospheric pressure. This scale is often written using the symbol "°C." You can convert a temperature from Celsius to Fahrenheit by multiplying the Celsius value by 9, dividing the result by 5, and then adding 32

Central air conditioning is a system designed to cool an entire home or building by using a single, centralized mechanism. These systems typically consist of an outdoor unit (the condenser and compressor) and an indoor unit (the evaporator coil), connected by refrigerant lines. A central AC system works by extracting heat from indoor air and...

A certified matched system is a term used for heating and cooling equipment that has been tested and approved by the Air Conditioning, Heating, and Refrigeration Institute (AHRI). AHRI evaluates these systems to ensure they work properly together and meet performance standards under specific test conditions. This certification guarantees that the components (like the furnace,...

CFM stands for cubic feet per minute, which is a standard unit of measurement for airflow in HVAC systems. It represents the volume of air moving through a space or ductwork within one minute. Proper airflow, measured in CFM, is essential for the efficient operation of heating, ventilation, and air conditioning systems. A typical guideline...

In HVAC systems, "charge" refers to the process of adding or adjusting the amount of refrigerant in a system to ensure it operates correctly and efficiently. Refrigerant is the special chemical that absorbs and releases heat to cool or heat a space. Properly charging a system means ensuring the correct amount of refrigerant is present...

A flexible hose specifically designed for use in HVAC systems to transfer refrigerant between the system and an external source, such as a refrigerant cylinder or a recovery machine. While its primary purpose is to add refrigerant to the system, it is also used during system evacuation or recovery to remove or adjust refrigerant levels....

A check valve is a device used in HVAC systems that allows fluids, like air, water, or refrigerant, to flow in only one direction and prevents them from flowing backward. It works automatically, using internal parts like a disc or ball that move to either block or allow flow, depending on the pressure in the...

A chiller is a machine used in HVAC systems to cool liquids. It does this by removing heat from the liquid, either through a vapor-compression or absorption refrigeration cycle. The chilled liquid is then circulated through equipment, like air handlers or cooling coils, to lower temperatures in buildings or industrial processes. Essentially, a chiller works...

A measurement used to evaluate how effectively an air purifier can clean the air in a specific space. Clean Air Delivery Rate indicates the volume of clean air (measured in cubic feet) the purifier can deliver per minute. Higher CADR numbers mean the unit can filter out pollutants, like dust, pollen, and smoke, more quickly...

A coil in HVAC refers to a heat exchanger device used in heating, ventilation, and air conditioning systems. It is responsible for either heating or cooling the air within the system. Coils can be located in an air handling unit, ductwork, or integrated into equipment like condensers and evaporators. There are two main types of...