# Peltier cold temperature does not transfer when a heat sink is attached

I am trying to build a peltier cooler.

It works. Cold side temperature is about 10C on cold plate of peltier. I want to blow this cool air out.

But the cold temperature goes up as soon as the heatsink plate or plane plate. It seems that the cold temperature is not transfer thru the heatsink or the plane plate.

I want to hear any recommendations for improving transferring cold temperature!

• Put the heatsink on the hot side. – vofa Jan 18 '18 at 1:49
• cold temperature is not transfer thru the heatsink ... cold does not flow from cold side to the heatsink ... heat moves from the cold side to the hot side .... the heatsink on the cold side moves more heat from surrounding air to the cold side ... you need to enclose the cold side in a box and it will move heat from inside the box to the hot side – jsotola Jan 18 '18 at 5:58