No you don't! Flair is very flexible.
With Flair your system can be as small as adding a single Puck so you can have a room sensor for your central system.
If you have a room that is too hot or too cold, you might install a single Puck and Smart Vent for that room. Many of our users use this flexibility to control the temperature in their nurseries or bedrooms. If every room is a different temperature and you want a consistent temperature throughout your home, you can place a Puck in each room and replace each of your old vents with our Smart Vents.
We try to be flexible to adapt to your life.