because of the weather, the temperature of my room, where the plants are is rising up to 27 degrees, some leafs change their color to yellow. is that a big problem? what am I supposed to do?
You should search for a deficiency symptom on leaves so you understand all of the signals they send to you, as keeper.
Could be deficiency, light burn or wrong watering technique! But as for temp, 27 is fine. Problems with temp are shown when the blades on the leaves curl up. That's temp or humidity problem.