My main issue with GS is the complexity. gas furnaces are pretty bulletproof; in my experience they are really reliable and east to fix (or just replace in a on

My main issue with GS is the complexity. gas furnaces are pretty bulletproof; in my experience they are really reliable and east to fix (or just replace in a one-day job) if there are issues. Air source is a little more complicated to fix but not too bad. Ground source though, part of the system is literally buried underground!