Rocket points at a small box on the hallway wall.
"What is that? It has numbers," he says.
Raven reads it. "It says 68. What do you notice when the heat turns on?"
Nova glows a warm orange. "Would you like a hint? That box is a switch."
A thermostat is a small box, usually on a wall.
It is a switch that turns heating or cooling on and off.
It switches at one special temperature.
That temperature is the set point.
| Part | What it does |
|---|---|
| Screen or dial | Shows the set point number |
| Buttons or dial | A grown-up changes the set point |
| Inside part | Senses how warm the room is |
| Cover | Stays closed. We look, we never open it |
| Sentence | True or false? |
|---|---|
| A thermostat is a switch. | ? |
| The set point is the temperature it is set to. | ? |
| Kids may open the thermostat cover. | ? |
| Raven read the number 68 in the story. | ? |
You met a thermostat like a real engineer!
Tomorrow, we find out how it decides.