Macbook air to a thunderbolt display

I have just connected my macbook air to a thunderbolt display, the fan runs continously. Is that normal

The GPU is working harder because it has to manage two displays, and one of them with a big resolution. You should not be worried, more when fans are working correctly.
What you can do is to decrease the Thunderbolt Display resolution in System Preferences > Displays, but note that you will lose image quality

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