Cold Sweat: Altitude is a Cold Sweat addon that adds fully configurable altitude-based temperature zones using a simple band system.

Requires Cold Sweat (v2.4.1).

Define custom temperature behaviour at any height - from deep underground to the upper sky - entirely through config. Each band can control temperature modifiers, dimension filtering, priority, protection requirements, shelter behaviour, and player warnings.

Features:

Configurable altitude bands with min/max Y ranges
Additive or multiplicative temperature modifiers
Dimension whitelist/blacklist support
Priority-based band resolution (no stacking conflicts)
Item-tag-based protection scaling (For pack makers)
Optional shelter-based exposure reduction
Configurable heat sources from Create: Aeronautics
Shelter detection for Create: Aeronautics ships (Sable contraptions)
Per-band warning messages and cooldowns
Clean integration with Cold Sweat (no overrides)
Runtime commands for debugging and inspection

Designed to be pack-agnostic, Cold Sweat: Altitude lets modpack authors create progression systems like cold mountain peaks, warm cave layers, or dangerous upper atmospheres without writing custom code.

Note: This mod has been made for custom pack, however I thought others may find it useful

This is an addon and is not affiliated with or endorsed by the Cold Sweat mod or its authors.

Config

Cold Sweat: Altitude uses altitude bands to control temperature based on height.
Each band defines a Y-level range and the temperature change within that range.

Config location
config/coldsweat_altitude-server.toml

Reload after editing (while world is running)
/coldsweat_altitude reload

Basic Band Example

[[bands]]
id = "high_mountains"
enabled = true
dimensions = ["minecraft:overworld"]
dimensionMode = "WHITELIST"
minY = 192
maxY = 255
temperatureModifier = -0.08
modifierMode = "ADD"
priority = 10
enableShelterCheck = true
shelterCheckRadius = 4
shelterReduction = 0.35

Important Values

minY / maxY
Height range where the band applies.

temperatureModifier
Temperature change applied in this band.
Negative values make it colder, positive values make it warmer.

modifierMode
ADD = adds directly (recommended)
MULTIPLY = scales existing temperature

Example:
-0.45 makes the area colder by 0.45

priority
If multiple bands match, the highest priority band wins.

dimensions / dimensionMode
WHITELIST = only listed dimensions
BLACKLIST = exclude listed dimensions

Shelter

If enabled, the mod checks if the player is inside a sheltered space.

shelterCheckRadius
Controls how far the shelter scan checks. Higher values detect larger rooms but cost more performance.

shelterReduction
Controls how much shelter reduces the altitude effect:

0.0 = no reduction
0.5 = up to 50% reduction
0.75 = up to 75% reduction
1.0 = up to 100% reduction

Example:
If temperatureModifier = -0.45 and shelterReduction = 0.75, full shelter leaves only 25% of the cold effect.

Protection Items

Custom item tags can be used to make existing equipment count as altitude protection.

protectionTag = "coldsweat_altitude:cold_altitude_protection"
requiredPieces = 1
protectionReductionPerPiece = 0.20
fullProtectionPieces = 4

protectionTag
The item tag checked on equipped armor/items.

requiredPieces
How many matching pieces are required before protection starts.

protectionReductionPerPiece
The reduction per matching piece.

fullProtectionPieces
The number of pieces treated as full protection.

Aeronautics Heat

If Create: Aeronautics / Sable is installed, ship interiors can use Aeronautics heat sources.

aeronauticsBurnerHeat = 0.14
aeronauticsBurnerRange = 7.0
aeronauticsSteamVentHeat = 0.12
aeronauticsSteamVentRange = 8.0

Higher heat values warm the player more.
Higher ranges make the heat source reach farther.

Debugging

Use:
/coldsweat_altitude status

This shows the active band, altitude modifier, shelter value, protection value, and detected heat sources.