How to enable ACPI in loader.conf?

I'm new to FreeBSD. I made some fan speed adjustments and have used "sysctl hw.acpi" in the terminal with root permission. Each time I boot my desktop, the default fan speed is loaded. When I type "sysctl hw.acpi" in the terminal window, my new settings take effect. Can ACPI be loaded at boot time in loader.conf? If so, how? I wanted to make sure I do not break my new system.

Thanks.
 
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