alt Hacker NewsYeah, ammonia can also be used, it's, IIRC, more efficient to use it and a bit safer because you don't high pressure, buuut enough ammonia in the air will suffocate you.
It's lighter than air so it will go away by itself if allowed to. For a purely exterior instalation it's much better than anything else.
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I have a heat pump that uses R290 (propane) (as well as an CO2 one for hot water) and would take that any day of the week over ammonia! The charge of propane is pretty tiny and the safety standards extremely strict, so not really concerning in terms of flammability, ammonia I would consider far, far more dangerous.
I feel like potential suffocation is not what I'd be most concerned about if I were in an atmosphere with high concentrations of gaseous ammonia.
> enough ammonia in the air will suffocate you.
It will suffocate you on account of all that blood pulp in your lungs. And eyes, and nasal mucosa...
Having a high pressure ammonia leak indoors is a death sentence for anybody in the same room. Same building, if it's large enough...