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My aircon is covered in ice and apparently this is a thing that happens and I am sweltering

Yup. Freezing is a known failure mode for air conditioners.

Hopefully it just means it's dirty or the fan has broken in it. Without enough airflow the evaporator coil will get too cold and freeze.

If the fan is ok and it's not dirty then it could have a more serious problem

@Bee O'Problem yeah, we had a massive spike of plants grow around it and left it for a day, and so I'm hoping that that's all it is.

If it's not that it apparently could be a coolant leak