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Thank you for the interest, Marcov! That's actually a very interesting point! For temperature sensor location, renatoa has it almost right: On the picture of the board, the large 14-pin IC is indeed the ADC for the thermocouples, with the 8-pin header for the TC connections just above. The temperaturer sensor for CJC is just to the left of the ADC, the very small 5-pin IC. (The larger 8-pin IC is the EEPROM chip.) This is as close to the ADC and TC header as I could get the sensor. Putting it on the back would have made manufacturing of the board a lot more complicated (and expensive), plus I would expect the same side to more closely match the temperature.

I did some tests when I first designed the board, against a TC4, and results were all within a degree C of each other. I don't think I wrote down those, but if there's strong interest I could look into running a few more tests to confirm.

If you are concerned about this, or want the absolute maximum in accuracy, you could mount the MOSFET vertically instead of flat on the board, that way heat transfer to the board would be minimal. Or even mount it off-board with a short 3-pin cable.