I'm working on a project to measure the efficiency of a mono-crystalline solar cell based on the temperature in an enclosure.
The solar cell is 150x130 mm and the enclosure will match that size and be a bit taller so I can introduce a light source.
My first plan for increasing the temperature beyond ambient temperature was to use either a heat gun or a hair dryer.
I have a thermal sensor to see the temperature inside as it increases, but I'm wondering what other options I have to control the temperature in this small enclosure more effectively.
I would like to increase the temperature to at least ~50°C, and on the other end possibly 0°C, which would likely require a different tool. I've also thought of using a small thermoelectric cooler in order to cool down the environment, as well as heat it up, but that requires a bit of setup so I'm not sure what other options I have.
TL;DR: What can I use to heat (and/or) cool a small insulated box?