I've been thinking a lot about tube in tube heat exchanger construction, and realized the guys running plastic external tubes are doing heat only so their heat exchangers are COLD (duh). Mine would be hot, so I'd need copped at least on the hot side.
Maybe 10 feet copper-copper then the rest copper-PEX with a thermal cut off.
More thoughts, maybe what would be equally energy saving would be web connected thermostat (NEST at least looks pimp) such that the cooling could be switched to a lower setting several hours prior to arriving. I suppose either a contactor, or a solid state relay with a bit of re-wiring would make that happen. This would also have the benefit of getting the thermostat away from the A/C this making it much more accurate. Anybody have any experience doing such a "conversion" to a window unit?
As another note, sorry for the terribly slow response, for some reason I didn't get a forum notification, I probably have this thread open in a browser window someplace.
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