Really, why could you not just take the difference between your base rate (AC not on) and your adjusted rate (AC ON)? Of course your readings would be off if your fridge's compressor kicks on, you start the dishwasher, or the kids start using the microwave, but if you hold everything else relatively constant then it should work just to take the difference in power usage and attribute it to the thing that changed; the AC. That said, art their little inline meters you can puck up for hose hold appliances? Perhaps something that runs on an X10 network? I am always curious how much power all the little stuff in my house takes. The meter reading method is not accurate enough over a short time for me to figure out things like the water cooler or the beer fridge :) ----------------------------------- Breaking in here. To measure just ONE item using the below method, you MUST turn off or disconnect EVERYTHING from the meter except whatever you want to check the power usage on. Even refrig's, a/c on the roof (kill the circuit breaker) etc. Then take and use the method below as the only load turning the power company meter then will be that device. Just don't forget to plug in the freezer's and refrig's..hate to waste food!! The pool stuff should be on its own circuit breaker, so just switch off all others AFTER shutting down your computer(s). Ed Culbertson. --------------------------------------------------- PLUG-discuss mailing list - PLUG-discuss@lists.plug.phoenix.az.us To subscribe, unsubscribe, or to change your mail settings: http://lists.PLUG.phoenix.az.us/mailman/listinfo/plug-discuss