Take a look at air source heat pumps, e.g. Mitsubishi. They are (probably) the future of HVAC. They also make it pretty easy to do a zoned system, e.g. separate

Take a look at air source heat pumps, e.g. Mitsubishi. They are (probably) the future of HVAC. They also make it pretty easy to do a zoned system, e.g. separate control for different parts of the house.