How to Save Money When Buying mist eliminator pad for sale

Just heard of these units--spray heads put out mist that gets sucked into condenser, cooling the air going into it. Comes with calcium filter to ensure fins don't get coated with calcium. I have seen misting systems in European restaurants that work great with people, but not sure about this. Some online comments I've seen from HVAC people:

"A piston metering device controls Freon flow with pressure difference. Spraying water on the outdoor coil lowers the head pressure. Therefore lower pressure difference, therefore lower flow through a fixed oriface. Therefore less cooling. However efficiency can go up, so compressor amps drop. If you use water spray, you will need to add Freon to get enough cooling. If you have a TXV, you will have less trouble. "

"water fills up the condenser fins creating less heat transfer un less the water is 50* lower than the ambient temp you are pissing in the wind .......and on your unit! "

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This is such a ridiculously simple concept, I can't believe it's not just everywhere. It was VERY easy to install.

One neat thing is that it doesn't spray water all the time, just when the a/c is on. I don't know what the effect of moist air will be over time - I don't want mold - but the A/C works just fine in the rain, so I'm not really worried.

After two weeks, looking at my own meter, it doesn't look like my A/C bill is much better, but it's tough to say just yet. I'll post updates later once my bills come in.

August update: it looks like my electric bill is indeed going to be lower, though I think it's by about $50. However, the flap that turns the water on when the A/C is on, and is supposed to turn the water off when the A/C is off, is getting stuck, so it's frequently misting 24 hours a day... causing me all sorts of issues, and running up my water bill to boot. It's a good thing that we're reaching the end of summer because I was about to turn it off anyway.

[Update 7/2/12]

After leaving this thing out over the winter, it froze and busted. So I bought a new one, and noticed that they had made some modifications. First, the instructions say not to leave it out over the winter because freezing will damage the seals on the device. I hadn't noticed that before... but the zip ties would make it pretty tough to get off and put back on, which is part of the reason I had left it out there. For the new device, they took away the zip ties and replaced it with a sticky pad so you can cement it to your A/C. Huh? That's even worse!!! One word: VELCRO. You want me to take it in during the winter, make it easy to remove and stick back on.

They also changed the filters so they're no longer screw on, but instead you have to cut the cable and feed it through. Not a big deal, just meant I couldn't use my old spare filter.

Regardless, the pressure regulator someone suggested in the comments seem to be working. It's spraying water when it should, it's not spraying when it shouldn't.

The only problem is that my electric usage is significantly higher than it was this time last summer, by about 33%. And that's after I cut my bill by replacing fridges, etc. AND put insulation all over the house. (That insulation is doing a great job keeping the cold in and the heat out: my A/C goes off far less frequently than my neighbors'.) I haven't actually seen the reported average temp for June , but while there have been a few VERY hot days, I'm not willing to place money on the idea that the average temp is really all that much higher.

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