reckman, your setup wins my personal coolness award for this year. nice work.
thanks, i think its a great option if you dont want to pay the extra 100% removing the extra heat from your house. Plus it cuts the noise in half
600 W is 2000 BTU/hr so a 1 ton / 1 kW unit can remove 12000 BTU/hr of heat and it has an EER of 12 that means you're using 2/12=1/6th of the unit's 1 hour duty at 167 W so I'd rule of thumb this around 1/3 of the wattage in additional cooling expense instead of 100%