The development of Internet of Things (IoT) applications is a multifaceted and demanding exercise that requires developers to navigate through several complicated tasks and challenges. Primary issues in this area stem from the absence of standardization and the complexity and heterogeneity inherent to the IoT landscape. Model-Driven Development (MDD) is considered an effective technique for IoT application development. We argue that there is a need for methodologies of MDD that encompass system development and integration, as well as organizational aspects. To compensate for this lack, this work introduces MIoTA (Modeling IoT Applications for Air Conditioning Facilities), a modeling method supporting IoT application development in the field of air conditioning facilities. The ADOxx-based MIoTA tool was developed in an industrial use case. It contains a Domain-Specific Modeling Language (DSML) and various functionalities to support the modeling and development processes, so no specific IT skills are required at the application level. The approach has been evaluated practically within the case study and with quality criteria in previous work.