Room Climate is a microclimate mod for Minecraft Forge 1.20.1 focused on survival, immersion, and modpack compatibility.

It simulates the thermal behavior of enclosed and semi-enclosed environments, allowing each room to develop its own climate based on sealing, materials, heat sources, cold sources, and exchange with the outside environment.

The mod was designed to work especially well with Desolate Planet and integrates with Cold Sweat, adding a more realistic survival layer without requiring client installation when used on a dedicated server.

Main features:

Enclosed rooms naturally heat up or cool down over time
Heat and cold leak through real openings to the outside
Slabs, stairs, and partial shapes count as physical barriers when they actually seal the environment
External temperature is based on biome, time of day, rain, altitude, underground depth, and dimension
Wall thermal mass: heavy materials store heat for longer periods
Material insulation: wood, wool, and insulating blocks retain temperature better than glass and metal
Solar gain through windows and translucent surfaces
Hot air rises and cold air sinks, creating thermal stratification
Heat sources only function properly when they are active
Local thermal radiation based on line of sight
Environmental humidity influences perceived temperature
Wet players feel colder
Clothing and armor reduce part of the thermal impact
Smoke and poor ventilation can cause negative effects in enclosed spaces with combustion
Rooms connected by open passages behave as a single thermal volume
Hot environments can melt ice and snow; cold environments can freeze still water
Integration with Cold Sweat to apply world temperature naturally
Designed with modpack compatibility in mind, with special focus on Desolate Planet

This mod is ideal for bases, shelters, space stations, underground structures, and any modpack where environmental control should matter as much as food, water, and energy.