Quantity   Component name
5 × TEC1-12706 peltier coolers
4 × 2SC2274 Discrete Semiconductors / Transistors, MOSFETs, FETs, IGBTs
2 × DS18B20 Sensors / Temperature, Thermal
2 × 20x4cm water chiller blocks Got it off Amazon
1 × Pi Pico with Micropython, the full board not a RP2040
1 × SPST switch low rating, for digital logic
1 × 4.7k ohm resistor carbon resistor
1 × 4.7 ohm resistor carbon resistor
4 × SP1a-L2-DC3V 2-coil latching relays
1 × Perfboard 3" x 4" minimum
1 × 1m 22 Ga solid wire
1 × 0.3m 20 Ga solid wire
3 × 4-pin AMP male power connectors AKA Molex, like you'd find powering a floppy drive
1 × Solder
1 × Flux
1 × Thermal paste
1 × Project box
1 × Power supply 12VDC 18A minimum, bonus if it can power the Pico as well