Okay, so I'm about to buy a house (as the user name suggests) and it currently has an OLD Arkla Servel unit that doesn't work. I wasn't able to find much of anything on Google about NG chillers in general. Are they more or less costly to run than electric split systems? Anybody in Houston service these? Are parts even available anymore? I suspect I'll probably end up replacing it unless it is cost effective to fix and operate it.