Pat I thought the cold side is limited and dependant on how much heat you could move away from the hot side. My hot side isn't hot enough meaning the HSF is almost too good.
I'll try a different voltage. I have a variable computer PSU and I can tap into the voltage rails and vary them up/down. Lots of settings to try.
edit:
Ok @5.2V DC TEC power, @1.1A, cold side 1ºC (and dropping slowly), hot side 19.7ºC (and dropping slowly), HSF fan @12V DC. I think I'm bleeding cold side to hot side .....the hot side is getting cooler I'm using a computer heatsink metal retaining spring clip and long allen key head drive shaft to hold it together. This is outside the box, I can feel it getting cold and hot side is getting cooler. I though heat flowed from hot to cold but anyway its definitely effecting it all.!
But @5V the TEC is not as good as at 6.95V! More to do on this obviously