Step 1 :The function $f(x)=2^{-x}+5$ is a transformation of the function $y=2^{-x}$, which is an exponential decay function.
Step 2 :As $x$ goes to infinity, $2^{-x}$ goes to 0.
Step 3 :Therefore, $f(x)$ goes to $0+5=5$.
Step 4 :We can confirm this by plotting the function.
Step 5 :The plot confirms that as $x$ goes to infinity, $f(x)$ approaches 5.
Step 6 :Therefore, the end behavior of $f(x)=2^{-x}+5$ as $x$ goes to infinity is that $f(x)$ goes to 5.
Step 7 :Final Answer: $\boxed{f(x) \text{ goes to } 5}$