Published Oct 24, 2026, 8:00 AM EDT

Jonathon Jachura is a mechanical engineer with over 12 years of HVAC industry experience who specializes in translating complex home systems into practical advice for everyday homeowners. His background spans technical sales and product management for major manufacturers, combined with hands-on experience as a two-time homeowner who has tackled everything from system installations to troubleshooting repairs. Jon focuses on helping readers make confident decisions about their homes through clear, actionable guidance that saves both time and money.

For most owners, the LEDs on a tool battery work like a gas gauge and nothing else, glanced at before work starts and forgotten until the motor stalls. That habit gets expensive.…