How to hook up a 240V 50Hz heat pump to 60Hz
Ask the manufacturer of the desired system how frequency sensitive their system is. Some equipment will work just fine at either 50 or 60 hertz with no adjustment, some will need some minor changes (move jumper or such), some will need major change (replace motors, or add variable frequency drive), some will not work without a rotary phase converter. Do not use a Variable frequency drive on anything other than motors unless endorsed by the manufacturer. Chances are you do not want to mess with a rotary phase converter.