Just because your unit works doesnt mean it is working as effectively and efficiently as it should you just haven't noticed , you probably think those male enhancement pills really work too.Saddle, some company manufacturers these screens for condensers. I tend to agree with you but if they make these screens they aren't going to accept any liability or they wouldn't make them-so they must do the job intended. I've used one for a couple of decades w/o any problems.
Look I have been an Hvac tech for 34 years ,5 of those as a test and evaluation tech in the engineering department of a major manufacturer here in Oklahoma, I know a little bit about it.
If you don't know that there are all kinds of things on the market that don't really work your being naive.
One .Example of what I'm talking about : the electrostatic washable filter ,even Paul Harvey touted it as the greatest filter ever,yet nearly every hvac manufacturer in the world will void their heat exchanger warranty because they restrict air flow just like screens around your condenser don't do it
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