Keltham rapidly rubs his hands together.  It produces heat.

If heat is still disorganized kinetic energy, expanding and compressing gases should make them colder and hotter.

"Promising.  I very likely know how to turn kinetic energy into cold without using magic, maybe using a river waterwheel as the source of kinetic energy.  Not sure how well it'll scale at your tech level, with any luck it's two orders of magnitude past Snowball, enough to enable food-preservation at scale, if you don't already have that... worth having a backup plan.  Do your seagoing ships travel against the wind?"

Keltham rapidly rubs his hands together.  It produces heat.

If heat is still disorganized kinetic energy, expanding and compressing gases should make them colder and hotter.

"Promising.  I very likely know how to turn kinetic energy into cold without using magic, maybe using a river waterwheel as the source of kinetic energy.  Not sure how well it'll scale at your tech level, with any luck it's two orders of magnitude past Snowball, enough to enable food-preservation at scale, if you don't already have that... I don't actually have a good sense for how that tech scales costwise.  Worth having a backup plan.  Do your seagoing ships travel against the wind?"

Keltham rapidly rubs his hands together.  It produces heat.

If heat is still disorganized kinetic energy, expanding and compressing gases should make them colder and hotter.

"Promising.  I very likely know how to turn mechanical motion into cold without using magic, maybe using a river waterwheel as the source of kinetic energy.  Not sure how well it'll scale at your tech level, with any luck it's two orders of magnitude past Snowball, enough to enable food-preservation at scale, if you don't already have that... I don't actually have a good sense for how that tech scales costwise.  Worth having a backup plan.  Do your seagoing ships travel against the wind?"

Keltham rapidly rubs his hands together.  It produces heat.

If heat is still disorganized kinetic energy, expanding and compressing gases should make them colder and hotter.

"Promising.  I very likely know how to turn mechanical motion into cold without using magic, maybe using a river waterwheel as the kinetic source.  Not sure how well it'll scale at your tech level, with any luck it's two orders of magnitude past Snowball, enough to enable food-preservation at scale, if you don't already have that... I don't actually have a good sense for how that tech scales costwise.  Worth having a backup plan.  Do your seagoing ships travel against the wind?"