Fixed Portable Airconditioner had an unlimited internal operating temperature.
Changed Portable Air Conditioner to have an internal Liquid Nitrogen tank that cannot be accessed. When it is connected to a Portables Connector, it will not transfer its atmosphere but instead do a heat exchange. If it is colder than the environment, and you have it set to heat, then it will use the internal heating element instead - but this will use substantially more power. Important: you will have to deconstruct to a kit and then replace the unit to generate the internal atmosphere if loading from an old save.
Fixed (beta) portable air con internal litre capacity was wrong.
Changed DynamicHydroponics no longer has an internal atmosphere. It now waters it plants from the inserted tank. This is to prevent gas or liquids getting "stuck" inside the the planter.
https://github.com/Niilo007/Stationeers-Research/wiki/Portables#portable-air-conditioner