[ethnt]

I was in a similar situation with my apartment PTAC unit, but mine has thermostat terminals — I would not be surprised if this one does too. I was able to hook up an Ecobee thermostat, with the downside being that it's way more expensive than OP's solution.

[newhotelowner]

30 years old PTAC has wired thermostat terminals. But I dolike OPs solution.