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Actually evaporation is the most efficient in all measures up to nearly 100% saturation of the surrounding air. In your more arid climates such as in Arizona Swamp coolers are the choice of cooling versus refrigerate.Rbredding;527292 wrote: good point GT, but realistically speaking, unless the thermostat is in the room with the chiller, you're only talking about a degree or degree and a half (AC unit runs for another 10 minutes every couple hours)
that room will be warmer, though, for sure..
and you're right, evaporative cooling is the cheapest method (if that's your measure of efficiency), chiller is the cheapest if you're measuring by how quickly a system will cool down.
The increase in room temp from the chiller would be hard to estimate unless you knew the actual heat transferred vs the room size and the efficiency of both units . I would venture to say a 4000 btu chiller will not impact a 6000 square foot house as much as it would a 1500 square foot house.
A chiller vented outside the home would actually help the main unit.
I recently setup 4 one thousand gallon systems with 4800 watts of metal halides per system and I maintain a 76degree water temp with one shop(20") fan per system. the ambient air temp is around 76 degrees in the warehouse where they are housed. I have them on ranco controllers so that it doesn't pull the temp to far down! I forgot they have 2 7500 gph dolphin pumps on each system as well.