Here's a config with comments as to what each thing does. Note that heatTransfer is technically optional and is only 0.1 by default. Heat Pump works by intercepting conducted heat and providing just enough cooling to neutralize the heat that is in danger of penetrating the tank wall into the tank contents. A non-zero heatTransfer is basically actual refrigeration beyond insulation cooling. This really should not be set very high unless the application is some sort of ISRU making cryogenic fuels.