A device or arrangement may be configured to receive a temperature limit such as an acceptable maximum temperature as well as a tolerance measure such as a number of acceptable events, the events causing the temperature to be outside of the temperature limit. An air comfort device may be operated based on the received temperature limit and the tolerance measure. A potential cost value may be provided based on a temperature limit and tolerance measure. A temperature limit and tolerance measure may be calculated based on a target cost value such that the arrangement may modify a temperature limit and/or tolerance measure to achieve the target cost value.