I would much sooner have a hydrocarbon plant or an Amonia plant next to my home then any other! The hydrocarbon will sort its self out in quick order over the ground, and in fire it will simply flare off with little left over products of burning.

As with amonia, and in a leak I will smell it long befor there is danger, or in big leak a wet rag will get me to a safe area.

But with HFCs HCFCs, there will be little escap in event of fire, it will poisen the air in such a way that no simple wet rag will get you to safety as it flairs off, a larg leak will not be knoticed with out electrical sensors befor it is too late.

The oil we use is flammible all ready thus fire risk is a weak excuse, the toxicity of the byproducts makes toxicity a poor excuse. So in the end my trust lies with HC and NH3!