Raws li cov tshuaj muaj pes tsawg leeg, cov tub yees muaj chiller tuaj yeem muab faib ua 5 pawg: inorganic compound refrigerants, freon, saturated hydrocarbon refrigerants, unsaturated hydrocarbon refrigerants, thiab azeotropic tov refrigerants. Raws li lub condensing siab, chiller refrigerants tuaj yeem muab faib ua 3 pawg: high-temperature (low-pressure) refrigerants, medium-temperature (medium-pressure) refrigerants, and low-temperature (high-pressure) refrigerants. Cov tub yees siv dav hauv kev lag luam chillers yog ammonia, freon, thiab hydrocarbons.