In testing, it seems like Glacial Heart can proc off of any attack you land while you have a hammer equipped, and the chill is localized near your target. You can drop a ranged AoE like scepter 2 (or to a lesser extent staff 3), weapon swap to a hammer that has Sigil of Intelligence, and it has a semi acceptable chance of chilling on the next few hits of your ranged AoE.
Sadly, even that case doesn’t chill 100% of the time, but I guess that move can attempt to control Glacial Heart’s randomness and help chase people down from range. When it works, anyway.