Written by Andrew Hammel

All RimWorld coolers operate effectively in space within RimWorld: Odyssey, and they are currently the sole built-in solution for managing heat aboard a spacecraft without requiring mods. You can safely install a freezer directly on your GravShip by positioning coolers so that their hot side faces the vacuum of space. This method functions independently of any internal heat venting system, which was previously necessary with older mods such as Save Our Ship 2.

This guide details how to construct a functional freezer, outlines its limitations, and explains how to power it within a ship.

How Coolers Function on a Ship

Coolers do work in space

Despite the absence of an atmosphere, the game considers any tile outside the ship as a valid area for heat disposal. This means you can vent the hot side of a cooler directly out through the ship's hull. The cold side cools the interior room while the hot side "vents" into space.

• A separate exhaust room is not required.
• Mods like Vanilla Temperature Expanded are not necessary.
• Space will passively absorb all generated heat without any temperature limit.

Only exterior walls are effective

A cooler can only release heat into space if it is placed against a wall that faces the vacuum. If both sides of the cooler are inside the ship or facing non-space tiles, it won't function properly.

Installation must be on the outer hull for proper operation.

Constructing a Functional Freezer on Your Ship

Step 1: Choose an external wall section

Locate a portion of your GravShip that borders empty space. This is where the cooler should be installed, ensuring the hot side faces outward.

Step 2: Build the freezer compartment

Use ship-grade walls and either a standard or auto-door to create a sealed chamber. Any internal size works, but a 3x3 to 4x4 area is typically sufficient. Fewer open doors make it easier to maintain a low temperature.

The freezer must be fully enclosed—no vents or unsealed openings. Keep the design simple and compact.

Step 3: Install the cooler

Position a cooler with the cold side inside the freezer and the hot side exposed to space. Confirm that the red side of the cooler is directly facing vacuum tiles.

If installed correctly, the cooler will activate and begin lowering the internal temperature of the freezer.

Step 4: Supply power to the cooler

Coolers require electricity to function. Movement-related systems like the GravCore do not provide power for utility structures.

• Use a chemfuel generator, RTG, or another compact power source.
• Wind and solar generators are ineffective in space.
• Ensure the freezer compartment is connected to your power grid.

Without power, the cooler won’t operate, and the room will gradually warm up over time.

Preserving Food in Space

Once constructed and powered, your freezer should quickly reach sub-zero temperatures. Set the cooler to -2°C or lower to ensure food remains frozen.

All perishable items stored inside will be preserved indefinitely. Place food items on shelves to improve hauling efficiency and prevent spoilage timers from activating.

Bonus: Integrating Freezer with Kitchen

When placing your freezer adjacent to a kitchen on board:

• Keep the rooms separate for better efficiency.
• Use an auto-door between the kitchen and freezer to minimize how long the door stays open.
• Avoid long-term storage of prepared meals in the freezer. Store raw ingredients inside and transfer finished dishes to the kitchen.

A single cooler is enough for a small to medium-sized freezer. Larger setups can use multiple coolers, though power consumption will increase accordingly.

Final Thoughts

RimWorld Odyssey simplifies building freezers in space more than ever before. There's no need for extra vent rooms, temperature control mods, or complex heat dissipation methods. Simply mount a cooler facing the vacuum, seal the room, and connect it to a power source.

Your food remains frozen, your colonists remain well-fed, and your GravShip remains efficient.

FAQ

Q: Can coolers expel heat into space in RimWorld Odyssey?

Yes. Coolers can discharge heat directly into the vacuum provided the red side is facing an external space tile.

Q: Do I need a secondary room for heat disposal like in SOS2?

No. Space automatically serves as the heat disposal zone. Dummy heat rooms are unnecessary.

Q: Is it okay to use vents or unsealed doors in a ship freezer?

No. These will allow warm air to enter and reduce cooling efficiency. The freezer must be completely sealed.

Q: What power sources are viable for freezers in space?

Only internal sources such as chemfuel generators. Wind and solar energy are not functional in a vacuum.

Q: Why isn’t my cooler working?

Verify that the hot side faces space, the unit is powered, and there are no gaps or openings in the freezer’s structure.

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