[Red Badger]

Ammonia has been used since 1876 as a refrigerant and it’s cheaper, more efficient, doesn’t harm the Ozone hole and doesn’t contribute to globull warming..................

http://www.goodway.com/hvac-blog/2009/08/ammonia-as-a-refrigerant-pros-and-cons/

[nascarnation]

Sounds like you can become a hero in Minnesota selling ammonia.