1
The heat in this room is unbearable.
To express this, sign 'heat' followed by 'room', and make sure to use a pained or exhausted facial expression. Your face tells the story of the intensity, showing the listener exactly how uncomfortable the high temperature is making you feel.
2
Please turn up the heat.
Start with the sign for 'heat', and then use an 'increase' sign or point your thumb upward. This sequence clearly demonstrates that you want the temperature raised, and you can add a slight shivering gesture to show you are cold.
3
I love the summer heat.
Sign 'summer' and then 'heat', pairing the entire sequence with a bright, positive facial expression and a relaxed posture. This demonstrates that, unlike someone who is uncomfortable, you actually enjoy the warmth and embrace the hot weather.