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Old 09-21-2013, 08:49 AM   #21
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Liberty Township , Ohio
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Remember that the amount of current that your A/C pulls is dependent on the outside air temp. In other words, a given A/C unit will pull less current at 65 degrees than at 100 degrees. As the outside air temp goes up, a higher pressure is required in the condenser to get the refrigerant to condense. Higher pressure means more work from the compressor, which means more current draw. Also, not all A/C's maintain pressure when off, so start up current isn't always a huge load. If the A/C unit has a capillary tube vice a TXV (thermostatic control valve), then the high and low sides will equalize in a few minutes once the compressor is off. That is mostly older units.

What's the point of all this? The only way to tell how much current your A/C will draw is to measure it in the actual conditions that you plan on using it (unless you can get charts for the compressor or A/C as whole). At 65 degrees, your A/C is doing hardly any real "work". The only difference between hi and lo in an A/C unit is the fan speed. Therefore, if the A/C works in lo at 65 degrees and not in hi, it won't be able to move any heat in any temperature that really needs it.

-Jason
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