It's an early adopter problem, and it could be much worse (looking at you, Tildes, where I swear I was one of less than 10 users who were not either well compensated professionals (tech or otherwise), or in school at the time to become one, at least before the latest Reddit exodus. At least most of the Lemmy instances, while tech heavy, don't have the same smugness that a lot of nearly-exclusively highly compensated white collar worker spaces do. (Not that Tildes is unique in that space in the least, Hacker News is utterly insufferable, and the personalfinance and povertyfinance subreddit split arose for the same reasons)
Luckily I think Lemmy has more potential to get more early adopters who don't work with tech professionally, especially on an instance like Beehaw. I haven't felt like some kind of lower class interloper (as someone who is in lower level retail management for work) here, unlike many other super techy spaces.
Right now in summer: 67 overnight while we sleep (helps that we have tiered power pricing where late night power is almost half the price of it during the day), 72 when we're up, and 80 between 2 and 6pm when we have the most expensive power hours. Luckily we're in an apartment that's like three years old, so it's surprisingly well insulated and hasn't gotten above 73 during those hot hours.