I never thought of it like that but if you restrict the intake the compression "heating" would/could decrease. So, perhaps it would run cooler. However, it is also pumping less air and consuming electrical power working against the intake side vacuum.
You could put a pressure gage on the discharge line after the pump. Without line loss and air stone restriction you would measure approximately the water head pressure. Water head pressure is equal to the depth of the air stones to the top of the water, divided by 2.31 Psi per foot of depth. For example, assume your pond is 10 foot deep and the air stones sit on the bottom. We have 10ft / 2.31 ft/Psi = 4.3 Psi water head pressure.
If you are not good a math, just pull the air stones up on the bank and read the pressure gage.
Many of those installations have the air pump in an enclosure to reduce noise. Without air flow across it the pump will run hot.
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