I hate to be a stickler, but I like helping with the right information when I can. Refrigeration systems do not make cold air. The air in the space that a unit is designed to service is drawn into an evaporator, and the heat from that air is given to the refrigerant flowing through that evaporator. That heat causes the refrigerant to flash to a gas, goes to the compressor, then the hot gas is pumped to the condensor where the heat is given off and the cycle begins again. So essentially, we just keep removing heat until the air temperature is where we want it. I have studied Psychrometrics pretty extensively, even in the realm of fluid mechanics, and this is the opinion of all of the professors' and professionals I have encountered. I mean no disrespect, I just like to share the right information. I have had my EPA 608 and 609 refrigeration certification cards for quite a few years and actively pursue refresher training every two years. As for the A/C-D/C issue, like it has been stated, load, insulation, size, frequency of temperature rises, average ambient temperature, even the sun shining on the unit all day can contribute to the amount of amps used per day.