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I install hood louvers on my vehicles to extract heat from the engine bay in order to prolong the life of under hood components, such as the battery, rubber components, etc.
I even go to the extent of installing a radiator-type electric fan to push / pull hot air up through the hood louvers when the engine bay temperatures get significantly above ambient, such as in stop-and-go traffic and upon engine shutdown after a trip in hot weather. When running on the highway, I can see via an engine bay temperature probe that the engine bay temperatures in my Mazda3 are the same as outside ambient.
Although I have not tried to quantify any differences in the air conditioner's performance, I suspect a cooler engine bay benefits the air conditioner system as well. Hood louvers certainly help in that regard.
I live in a hot and humid climate in which the air conditioner is operating most of the time.
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