I'm new to temperature control. I purchased a 5 cu ft chest freezer and A419 controller and have cooling taken care of. What's the preferred equipment for heating inside the freezer for a single fermenter?
1. Buy a heated wrap at a homebrew shop. Can you still have the probe on the outside of the fermenter (under insulation)?
2. Put a flat heating pad (plant heater or reptile tank warmer) on a freezer wall. I have a 15W one for plant seed starting that doesn't seem to put out much heat.
3. DIY reptile heater bulb (no light emission) placed inside the freezer. My local pet store has 60W, 100W & 150W.