From the DailyMail, a man staying right next door to the couple who died:
“It was hard to sleep last night — every time the a/c came on, I woke up... We’re continuing our vacation because that’s what I would want people to do if I were to have been one who died ..."
Wow, I would be OUT of that hotel the moment I found out this happened. No way in hell would I stick around.
Those AC units might indeed use Freon, AKA R22, which is a chlorofluorocarbon (CFC). While CFCs have been banned for years due to the environmental harm they cause, the use of recycled, recovered or reclaimed refrigerant is still allowed to service existing HVAC systems. Perhaps they added a refrigerant to the AC while servicing the unit which caused the toxicity. R22 can cause pulmonary edema (fluid buildup in lungs) which can in turn lead to death. They can also irritate then skin and cause burns (perhaps the "rash" that was reported).
However, CFCs don't typically cause paralysis or convulsions as reported in these cases. If the survivor indeed suffered from paralysis as her son noted, then that points more to
organophosphate (OP) poisoning. Acetylcholine builds up and causes overstimulation leading to convulsions or paralysis. OPs are found in insecticides and cause on average ~200,000 deaths per year. It's a shame these harmful insecticides are used as they are bad for both the environment and for people!