Do not miss being a team leader during heatwaves. But to share my top tip: on really hot days in the office I'd pop to the local corner shop and buy a round of cheap ice lollies. Cost less than a tenner and was a guaranteed mood booster. Was it cheap bribery? Yes. Did it tangibly demonstrate someone in the management team gave a shit about the team's discomfort (given that WFH wasn't an option)? Also yes.
@summerbeth very good point. I'm going to send my boss (me) to get my team (me) an ice cream from the freezer (not me).
@summerbeth absolutely, done that in the past, another time bought a load of cheap usb fans for everyone.