Bond|funded contract
Carbon Monoxide (CO)|common byproduct of combustion processes
Chiller|hydronic cooling unit
CFC refrigerant|a class of refrigerants with chlorine, fluorine, and carbon
Compressor|in a refrigeration system, the mechanical device that converts low-pressure, low-temperature refrigerant gas into high-temperature, high-pressure refrigerant gas.
Condenser|heat exchanger that transfers heat from the refrigerant flowing inside it to the air or water flowing over it.
Easement|a portion of a property set aside for public utilities or municipalities access.
Evaporator|heat exchanger that transfers heat from the air flowing over it to the cooler refrigerant flowing through it.
Expansion device|liquid metering device
Heat pump|produces heat by reversing the mechanical refrigeration cycle.
Heat transfer|transfers heat from a warmer substance to a color substance.
HCFC refrigerant|class of refrigerants that contains hydrogen, chlorine, fluorine, and carbon. 
Hydronic|heating or air conditioning system that uses water as a heat transfer medium.
International Building Code (IBC)|a series of model construction codes that set standards applicable across the country.
Mechanical refrigeration|use of machinery to provide cooling
Mechanical refrigeration cycle|process which a circulating refrigerant absorbs heat from one location and transfers it to another location.
Noxious|harmful to one’s health
On the job learning (OJL)|learning done while working under the supervision of a journeyman. 
Reclaimed|used refrigerant manufactured to bring it up to the standards required of new refrigerant. 
Recovery|removal and temporary storage of refrigerant in contains approved for that purpose.
Recycling|circulating recovered refrigerant through filtering devices that remove moisture, acid, and other contaminants.
Sustainable|___________ construction uses material in a way that preserved natural resources and minimizes pollution.
Toxic|poisonous