The Science behind it.

The refrigerant, like most substances, expands when it is heated and contracts when it is cooled. The refrigerant is specially selected for its ability to transfer heat. It is especially well-suited to absorbing heat and expanding and then giving off this heat when exposed to cooler air and compression.

Historically, freon has been the refrigerant of choice. However, for environmental reasons, Freon is being phased out as a refrigerant and being replaced primarily by R410A, which appears under the trademarks of Puron™ and Environ™. It is now against the law to vent freon to the atmosphere, but leaks and accidents do happen.

Read the full article at: http://www.fullerheating.com/fhonline/hvac/residential/products/cac/centair.html

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