Background: Many moons ago I had the pleasure of working with two licensed HVAC/electrical guys who maintained the plant. I owe them a huge debt of gratitude for teaching me, at a laymans level, how mechanical things work.
This is just a curiousity question.
I remember one of them telling me about someway he heated his water in the summer from his HVAC unit.
Had not thought about this for many years. But how did he do it? Did this technology catch on? It is something you guys do in the field? He related it to "free hot water" since he had to cool his house anyway.