Heat your shop. Cool your shop.
All air conditioners work basically in the same way: A cycle of evaporating and condensing refrigerant cools the air on the inside of the room and releases heat to the outside. As an added benefit, cooler air holds less moisture, so an air conditioner removes humidity naturally: great for your comfort and your cast iron.
The main differences in air conditioners are Btu capacity and shape. If you can't stand the heat in your shop, here are AC units to consider.
Pint-size, rollaway, portable air conditioning units like the one shown below are low-dough options. But don't expect one to counter triple-digit heat, or cool large or uninsulated spaces. It's more useful in mild climates requiring only occasional cooling. And it needs only a 110-volt outlet and a door, window, or cut-out to accommodate its vent hose, which exhausts the hot air and humidity to the outside.
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