I wound up going down an interesting internet rabbit hole on this subject. Amazing how poorly this data is tracked
Maricopa made headlines with 425 confirmed deaths (with 199 under investigation). Pima (64 by August) and Pinal (42 just in July) counties also had several.
The Texas tribune reported 97 deaths in Texas by early Sept (seems likely to be an undercount)
CA data is weirdly hard to find but there have been at least 18 in Imperial county and 2 in Riverside
Louisiana reported 25 by 8/22. Also likely an undercount given LA had it's hottest summer ever
So that's a very incomplete tally of deaths in just 2 states and a few counties in 2 others totaling 699 deaths
There were over 1700 US heat deaths in 2022 and heat deaths have exceeded 1000 in 4 of the last 5 years with a sharp upward trend. My money's on YES