I had a Trainn, it ran all the time and was only good for 30 degrees diff from the outside temp. Previous and current HVAC does 70 degrees in 100 outside or 0 outside.
Neighbor got one of those variable scroll(SP?) compressor hvacs. He keeps it 68 year round. It does deliver and is cheaper than before, but the outside unit runs sun up to sun down without cycling like our unit.