Honeywell's Lyric T5 is the least expensive Wi-Fi thermostat I've reviewed to date at $150, a whopping 100 bucks less than Nest. The T5 is operated via a touch screen whereas the the RTH6580 doesn’t have a touch screen but is operated by the buttons on the front. While essentially, they are the same, there are some major differences, which can affect a buyer’s decision.

When comparing the two models, the T5’s biggest drawback is that it doesn't have the same motion and humidity sensors the Lyric Round has. Difference #1: Ventilation – Lyric T5 does not support Universal Relay (U terminals) for ventilation, whereas the T6 Pro model can control ventilation equipment with ERV (Energy Recovery Ventilator) / HRV (Heat Recovery Ventilator) or damper. Honeywell Lyric T5 vs. T6 Pro — The Differences. furnace), but the Lyric T5+ has a C-Wire Power Adapter included to provide power if needed.

Smart integration. It works with Apple … The T5+ is compatible with Google Home while T5 …
“But if you haven’t fully made that leap, the Lyric T5 provides similar connected functionality with more of a hands-on approach.” That means much more granular control.

These are the results of our Nest vs. Honeywell face-off! Going a little deeper into their descriptions can help you understand which one is more suitable for your needs.


The Honeywell Lyric T5 Wi-Fi thermostat is a lean version of the Honeywell Lyric Round. Honeywell presents two smart thermostat models, Lyric T5 Wi-Fi and T6 Pro Wi-Fi. Consumer Reports pit the Nest Learning Thermostat against the Honeywell Lyric T5 to see which smart thermostat reigned supreme.

The Honeywell Lyric T5 Wi-Fi Thermostat requires a C wire which can be connected to a heating and cooling system (e.g. Smart Home Compatibility.

I am rubbing my head in disbelief as I write this but it seems that the older Honeywell thermostat, the RTH6580 is compatible with more smart home systems than the Lyric T5 is.