Residential buildings in northern China use a lot of energy for heating, more than in other countries. A study looked at how to save energy by improving building design and how people use heating. They found that the current energy efficiency standard in Tianjin still uses more energy than in Germany. Keeping indoor temperatures high and opening windows a lot makes heating more expensive. Radiator heating is better than radiant floor heating. Using certain controls for heating and ventilation can save energy. Having a device to clean the air can help reduce the need to open windows. It's also important for people to be aware of how much energy they use.