Not all Monobloc Air Conditioinng units are the same
The safety requirements for R290 refirgerant is set out in the international safety standard IEC 60335-2-40 - including SAFE room size and installation height.
If you're comparing Monobloc AC units, check the refrigerant charge. When it's above 152g, it triggers extra safety requirements around room size and mounting height.
Some lower priced units offer higher refrigerant charges, that it not the problem, but how the unit it going to be installed is. It's important to understand and read the guidance - safety requirements can be there technically there in the small print, but they're not communicated clearly enough for an installer to easily get right. If a unit ends up fitted in too small a room, or mounted lower than it should be, that safety margin, the thing that makes propane units so safe in the first place quietly disappears.
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