WaPo... Is Ammonia or Butane The Next Refrigerant?

"A bigger question: What will replace these chemicals? Experts say that some substitutes, with less global warming impact, can be made with new HFCs or by using ammonia or butane. But others are needed. "We don't know all of them yet," said Mack McFarland, global environmental manager for DuPont Fluoroproducts, a division of Delaware-based DuPont."

Of course, we know that residential air conditioning systems never leak, that all lines are sweated perfectly, every time. And besides, what harm could come from a little ammonia or butane leak in your attic?

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