And then there's ammonia, which is still often used in industrial applications.
The whole flammability issue is way overstated for smaller systems. The oil used makes all refrigerants flammable. Moreover, the HVAC techs seem to have nothing against similarly flammable lithium batteries. It's a conspiracy by the fluorocarbon industry.
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To my surprise, shortly after Naomi Wu gave me a bit of fame for making good use of solar power, Allie Moore got really jealous of her...
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