According to NASA’s Earth Science Study, yes. As plants release some of their moisture it can help get stuffy air flowing and might knock a few degrees off your thermometer.
My goodness – you’d have to have a veritable jungle in your vestibule for it to make any impact, surely?
Does looking at plants help to relax/cool you? I would certainly agree with that. White, silvery shades (seeming frosty?) might help.
On the plus side, looking after plants, watering and so on could be beneficial if you want to cool down.
Most importantly – Do plants make you look cool?? Without Doubt! It’s worth a try anyway isn’t it, and may end up being a distraction from our mini heatwave.