I've been wondering for a while, and not least now that I've found a post here about how to solve my calibration issues on the Sestos S1D PID, whether the ambient temperature surrounding the mashing container will effect the container in such a way that I may need to recalibrate depending on season?
I live in Iceland and I usually brew on my balconies. This means that I'll be brewing in temperatures ranging from -5°C to maybe +15°C. I have a 50 liter steel pot and a 5500 W element. I usually mash with around 35 liters in the pot, excluding grains.
To formulate my question specifically: Would a 20°C difference in ambient temperature significantly alter the mashing temperature or would the PID be able to keep it under control?