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Unit is tested: Air blowing up for the return is 78.8 and air supply going in is 54.0.

AC vendor then inspected the indoor fan motor and tells me it should be set to high.

Explains it should be on high for AZ summers unless you're concerned with humidity. Turn it to high and you'll get more humidity (or maybe I have that backwards.)

I asked if the indoor fan motor is set to high won't this cause more stress to the unit? I was told no.

If possible I'd like to leave the AC on high until the fall and keep the renter happy. The renter wanted stronger air flow.

Question: Will changing the speed setting from low to high potentially cause problems?

Should I change it back down to low? I'm in AZ where it's well over 100 everyday during the summer months.
 

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The fan motor is designed to work at both speeds. As long as the install is correct and everything is maintained properly you should still get normal life out of it.
 
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