For a 100mbps service, the TP-Link AC1900 Archer A8 is a solid choice. If you’re on a budget and want a new router, this one should meet your needs. However, if you’re considering a nicer, slightly older router used, make sure it supports the required Wi-Fi standards for your devices. Look for at least AC1200 or higher. Additionally, check if the used router has any warranty or return options. If budget isn’t a concern, buying a newer model with advanced features could provide better performance and support for future upgrades.

If you have a smart home or many smart devices minus cameras: It’s worth mentioning that the TP-Link Archer A8 does not support the Matter or Thread smart home protocols. The Matter protocol, formerly known as Project CHIP (Connected Home over IP), is designed to create a unified and secure smart home standard. Similarly, Thread is a low-power, IP-based wireless protocol for smart home devices. While the Archer A8 is a capable router, it does not have native support for these specific protocols. If you’re looking for a router that supports Matter and Thread, you may want to consider other options that explicitly mention compatibility with these protocols.

Is it possible that the reason that the thermostat gets the internet is because it’s a thread device? Look up “Thread” for more info.

If you have a coax cable in the wall, it’s very likely you have what you need for home internet, minus the modem and router. Your ISP will set you up with service, and your modem will connect to that coax cable. The router then connects to the modem, and you get wired & wireless internet from there.

I recommend not using modem/router combos that ISPs offer, and getting your own devices. Just make sure that they will work with your ISP service.