We answer the most important questions about architecture. "Trends and the future" is our first keyword: What will the heating system of the future look like? While our grandparents' generation, and to some extent our parents' generation, used individual stoves to heat their homes, over the decades these have been replaced by central heating systems with radiators. Nowadays, underfloor heating is the state of the art. Solutions such as wall/ceiling heating or infrared systems are still niche products. However, due to climate change and the need to become more energy efficient, the main focus is increasingly on optimising heat generation systems, whereby a combination with room cooling is becoming more and more important due to the increasing number of hot days. Legislation is also increasingly responding to these challenges. For example, an amendment to Vienna's building regulations stipulates the efficient use of energy sources. This means that pure oil or gas heating systems will increasingly disappear. The heat pump appears to be an effective means of achieving these goals. The heat pump uses a heat exchanger to generate the energy required for heating or cooling from air, water or geothermal heat. The heat pump requires electricity to operate and if this comes from sustainable sources, the ecological balance sheet looks quite good. Conclusion: We can assume that the heating system of the future will be an optimised combination of existing systems.