There are plenty of non conductors in the world. The most common is probably plastic or rubber. Glass is also non conductive. Hope this helps!
Generally, non metals are non conductors (with exceptions such as graphite, fullerene etc)
metal
Most non-metals are in fact considered to be non-conductors. Some non-metals however do have the ability to conduct heat and electricity.
Some are, such as silicon and germanium. Others are non-conductors known as insulators, such as glass.
rubber
Graphite
strong
Metals are good conductors. Some non-metals are good conductors, but many others are not.
non metals are gases and are poor conductors at room temperature
Hmmm.... It would be hard to say any material was a non-conductor of heat, although certainly some materials are better heat conductors than others. Carbon forms Graphite and Diamond, both of which are relatively good heat conductors. (Graphite is also a good electrical conductor). Air and gasses tend to be poor heat conductors due to the rarefied nature of their molecules. and the best insulators such as silica aerogel utilize this, as well as limiting convection.
In the natural world the answer is definitely yes. Naturally occurring metals where the only things that really conducted. But with modern civilization we are extracting the metals out of the minerals. But still there are more non conductors.
could it be insulators?