Hello Sandrew,
It's nice to see you here in the Google Nest Community Forum seeking answers about your system's compatibility with the Nest Thermostat! I'd be happy to take a look at this for you.
I did find a helpful article to check the Nest Thermostat compatibility with an interactive compatibility checker. But I'm curious about how your heat pump works. Can you share with us your thermostat's wiring setup and the make and model of it? This would help us identify the wiring placement and how we can label them.
I'll look forward to your response.
Regards,
Mark
