@sarm4d
Yes, you are right... Ready-made are available in Rs. 800 but they only helps in color de-fading but totally useless as Insulator.
U might have seen many cultus that when owner removed dashboard carpet, they found cracks(Although color remains safe) + A/C performance also get affected as car is already hot + it takes more time to cool this hotness
Yaar namda smells and also when you will switch ON & OFF the A/C, moisture will be created in namda and will cause bad smell.
Yar i have seen material like sponge or foam like material(material which is also used in desktop PC on motherboard for insulation)..If you stitch it under dashboard carpet/cover, it will also be helpful
Also see this brand:
https://www.covercraft.com/us/en/dash-covers