2020 Keystone Hideout. Safe to unhook battery? full timers

I have a heat detection laser guided gun, everything & I mean everything in the breaker box was 82 degrees EXCEPT the a/c breaker which was 92 degrees keep in mind the a/c has been running most of the day due to it being almost 90 degrees here in Texas. I called a certified electrician he said it could possibly be doing that because the trailer is a 2020 & has been set up for less than 3 weeks it could just be a 'new' smell.