ARM Laptops Questions, Again!

I'm considering getting an ARM-based Windows laptop for work, and my primary concern is battery life. I've seen conflicting reports on Reddit about how long these machines can actually last on a charge. I understand that usage varies widely—some users run apps that may not yet be fully optimized for ARM architecture, which naturally affects performance and battery.
My key question is about the impact of screen readers like JAWS and NVDA, as well as other book-reading apps. Since this will be a work machine (I already own a MacBook Air, where battery life has never been a concern), I need to know whether JAWS and NVDA noticeably affect battery life, generate more heat, or trigger constant fan activity.
Moving from a silent and efficient Mac to a device with active cooling and potentially shorter battery life would be a significant shift for me. I've read that JAWS is optimized for ARM-based PCs—does that mean it consumes less power or runs more efficiently compared to NVDA?
I’d really appreciate it if anyone could share concrete experiences regarding how JAWS and NVDA affect battery life, thermals, and overall performance on ARM laptops. Thanks in advance for your help!