| Infrared thermometer |  |   | 
|  | We go on our thermal discovery journey with this infrard thermometer. Push the button the measure the surface temperature. | 
| Roof window |  |   | 
|  | Good visible, the frame of the window is the worst cold bridge. So is at a window the u-value for the glass and the complete window listed. | 
| External wall temperature |  |   | 
|  | Left from the window is an internal wall, right from the window the front door. At an older not so good insulated house would be the external wall colder. | 
| Morning sun in winter |  |   | 
|  | No effect has the deep standing morning sun in winter on the white wall.The higher temperature above is by the floor heating. | 
| Refrigerator |  |   | 
|  | The refrigerator works like a heat pump. The compressor pushes the coolant with high pressure into the condenser on the rearside. The condenser becomes warmer. |