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I am using an Ecobee thermostat with a heat pump and it is working, for both heating and cooling. Is it doing something inefficient or wrong? What am I missing out on?

Edit: Ecobee says they support heat pumps. https://support.ecobee.com/s/articles/What-types-of-HVAC-sys...

Which heat pump do you have? I’m on a Mitsubishi which requires a bridge unit which has its issues.

I use a Nest thermostat with a 2-stage ground sourced heat pump (a.k.a. geothermal) that also has backup resistive heating. It works perfectly fine. It will run a single stage most of the time, or both stages if it's trying to change the temperature by more than a couple of degrees.

I have mine set to treat the resistive heating as emergency backup, but I believe I could also configure it to treat it as a third stage and run it automatically.

I keep reading that, at least for air source heat pumps, it cuts into a lot of the efficiency advantages if it’s cycling a lot. Better to run at a low stage for a long time as opposed to a higher stage on and off.

Maybe I should just try and see what how it works for me though.

Comfortnet works pretty well, and I can control it via an app.