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Part of the reason you're getting better dehumidification and lower elec consumption is the coil depth.
Newer units have more surface depth so the air is in contact longer and touches more coil.
You should see what a 6 pass commercial unit can do !
With the variable speed fan you will have a hard time meetering watt usage. If it makes a slight whine as it speeds up and down or ramps smoothly not just "changing gears" it probably is running off a Variable Frequency Drive. Unless you have some real good equiptment or its running at 100% it will give some weird readings.
Look inside the unit for a bok around 6"X8" with a display on it. You may be able to scroll the display to show amps or watts, think of it like a scan gage for an elec motor.
That said, your electric bill proves the savings !
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