Hey,
No, the reverse engineered integration of Hilo into HA is nowhere near stable enough for me to trust it with thermostats. I only use it to read the meter. The reading of the meter fails every few weeks, but the thermostats directly in Hubitat are almost flawless, so long as the thermostats themselves don’t get stuck. It happened about 3 times in two years that one of my 11 thermostats got stuck on reporting always the same power (the actual heating/idling kept working), which was quickly fixed by a breaker on/off cycle.
I integrated the Stelpro thermostats directly into Hubitat. I wrote a Zigbee driver for it, which is available through HPM or GitHub