# kldload coretemp
# sysctl dev.cpu | grep temperature
dev.cpu.3.temperature: 22.0C
dev.cpu.2.temperature: 22.0C
dev.cpu.1.temperature: 22.0C
dev.cpu.0.temperature: 24.0C
# kldunload coretemp
/boot/loader.conf
coretemp_load="YES"