Could you take him for a drive today to get in a good sleep in the car air con or go to the shops and wander around for him to have a cool sleep?
Also make sure there isn't a waterproof mattress protector on his cot as that will be making him sweat, go for all cotton/bamboo bedding + clothing and place a towel over his mattress but under his cotton bottom sheet.
Sheepskin rug with a cotton sheet ontop keeps baby cool, dressed in a nappy and singlet. I also used baby powder to keep baby fresh and less sticky and sweaty
Not sure if it's been mentioned but I put a bowl of icey water on a side table then had the fan blowing that, not directly at the cot but it creates a cool breeze, not much but enough to not feel like hot air. Worth a try.
A few weeks ago we had really hot weather and the aircon broke down just when we needed it, ugh! I just dressed DS in a nappy and singlet for the day, and draped a damp muslin cloth over his bassinette and the pegged it tight (and checked often) so it couldn't fall on top of him. I then had the ceiling fan on full blast and the temp inside his bassinette was actually really cool. The cloth wasn't dripping wet, I just wet it and rung it out hard so it was damp but not dripping, then sprayed it with water to make it damp again when needed.
Hot weather really sucks when you don't have adequate aircon!
I haven't read the rest of replies so not sure if its been mentioned already but I would set up a mattress on the floor in the lounge where the aircon is.
Only the lounge and master bedroom has aircon at my place (Im in bris too) and when its really hot I put mattresses on the floor in the lounge or on my bedroom floor and we all camp out. The kids def sleep better in the cool aircon.
Give him a bath, nappy only when he gets out.
I read that you're running the air con now which is good.
Surely the plastic smell won't take too long to dissipate now it's running?
Mattress on the floor in the lounge room for sure!
We still do it now on unbearable nights, and all the kids are almost 10!
We have a Nobo portable aircon (pro cool is same machine with new name) works well with no smell but isnt cheap ...we are brisbane also and couldnt survive without it
Another trick is get a bucket of ice infront of a fan and will cool down a little
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