24V controls: Any inverter heat pump will run best with a communicating thermostat. We can make efficiency sacrifices to run the system on 24V controls, but it

24V controls: Any inverter heat pump will run best with a communicating thermostat. We can make efficiency sacrifices to run the system on 24V controls, but it would not be my recommended setup. Refrigerants: this is largely dictated by compressor availability. At this point it looks like R454B is the winner (GWP 467) You're right about new construction builders wanting whatever is cheapest. They don't bear the cost of ownership, so there's very little incentive to go for efficient equipment. Doing replacements on oil is great! The monthly savings when moving from electric resistance, propane and fuel oil are huge. Connectivity - system runs fine standalone without any internet connection. If you decide to get in the heat pump game come say hi at the next AHR expo!