Honeywell has been providing thermostat solutions for residential and commercial applications for over 100 years. Two of its latest releases, the Lyric T5 and Lyric T6 Pro, are incredibly similar. They’re so alike that it’s nearly impossible to find anything online about the differences between the two. So, we did some research and have put together all the differences we could find between the Lyric T5 vs. Lyric T6 Pro thermostats.