It includes the electrotechnical, heating, ventilating, air conditioning, refrigeration and plumbing industries. Air conditioning and electric power steering were standard equipment. All suites have individual central air conditioning. He installed modern systems, including central air conditioning. It is a collapsible tent with provisions for air conditioning and heating. Automatic electric air conditioning also became available. Server rooms are equipped with air conditioning devices. Air conditioning and power windows were optional. Standard for the Installation of Air Conditioning and Ventilating Systems. R-427A is for use in air conditioning and refrigeration applications. These include air conditioning, navigation systems, and in car entertainment. Air conditioning and a rear window defogger were optional. Certain comfort features such as carpets, power windows, air conditioning and radio were deleted. R-407C is for use in air conditioning. Hz AC to power air conditioning and other ancillaries.