Will plants be affected if it is too hot or cold?

The answer is yes.If you place them near heating venting or in front of fans or too much light,you are harming them.It is difficult to find out if the plants are too cold or hot but if their leaves starts turn yellow and starts dropping,it is the sign of too much heat and light.If they start turning discoloured or brown,it is the sign of being too cold.If you start to notice all this,immediately move your plant to a place with room temperature.