Probability of pools freezing in summer

[ShayanJ]

One of my classmates asked an interesting question that I have no idea how to deal with. Prove that if $\hbar=1$, then of every 1000 pools, one will freeze in summer!
I really can think of nothing at all. Any suggestions?
Thanks

 

[Heinera]

Well, since $\hbar\approx 4.5\times10^{-16}\text{eV}\cdot\text{s}$, then obviously you would see quantum uncertainty even for macroscopic objects if $\hbar$ was $10^{16}$ times larger.