Published May 13, 2026, 1:00 PM 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. When Xfinity set up our service, they left behind a router/modem combo unit. I used it for a few weeks — long enough to confirm the internet was working — and then replaced it. That part was always the plan. I'd already decided on a Ubiquiti system before we moved in, and I'd had our builder run Ethernet during construction: office, bedrooms, behind every TV mounting location, and ceiling drops for access points.…