re: Paging HVAC guys...Do you think this product works?

1) Anytime you see something like this, you should remember that if stuff like that really made a big difference in the performance of the unit, the manufacturers of them would be using them already to build a better product than their competition.

2) If you're just hooking up a regular water supply to it, the water you're spraying all over those coils almost surely contains a good bit of dissolved minerals. When you're constantly spraying that on hot coils and evaporating off the water, the minerals stay behind. You're likely to end up plating over the coils with an incredibly hard and nearly unremovable layer of basically rock and fricking the heat transfer coefficient of the unit up big time.

3) Condensing units are designed to be outdoors, but are not designed to constantly have water being sprayed into them. The water that doesn't evaporate off the coil is just going to drip into the cabinet of the unit and sit there, setting up all kinds of possible corrosion problems with the unit's cabinet.

I'm skeptical.