They are air, calcium chloride brine, sodium chloride brine, alcohol, and similar nonfreezing solutions. The purpose of Class 2 refrigerants is to receive a reduction of temperature from Class 1 refrigerants and convey this lower temperature to the area to be air-conditioned.
Elections for the United States Senate will be held on November 8, 2016, with 34 of the 100 seats in the Senate being contested in regular elections whose winners will serve six-year terms from January 3, 2017 until January 3, 2023.
The next election will be in 2018. Class 3 U.S. Senators belong to the electoral cycle that were elected for two United States Congresses in the first elections of 1845, and then the seat was contested again every three Congresses (six years) thereafter.