I know that Peltier coolers are probably the most impractical way to cool a room — they’re inefficient, power-hungry, and don’t give you much cold output for the electricity they consume. On top of that, condensation becomes a serious issue when things finally start getting cold.
But keeping all of that in mind… what if we don’t use just one Peltier, but six of them working together? Could we actually build a homemade air conditioner that produces noticeable cold air? In this video, I put the idea to the test and built what I call the Freezing Tunnel — a DIY cooling machine made entirely out of Peltier modules, radiators, and a lot of creativity.
The result? Crazy high power consumption, condensation challenges, and surprisingly cold air coming out the other side. Let’s see exactly how far I was able to push this experiment.
Time Stamps:
0:00 - Intro, What are we doing
0:37 - Building The Tunnel
3:00 - Water Line for Liquid Cooling
4:01 - First Tests
4:50 - Final Tests
6:17 - Conclusion, Future Plans
To bring this DIY air conditioner to life, I combined several components into one compact system:
- 6x TEC1-12706 Peltier modules – the core of the build, generating the cold and hot sides.
- Custom aluminum heat sink tunnel – designed to direct airflow and maximize cooling efficiency.
- Water cooling loop & PC radiator – to handle the extreme heat output from the hot side of the Peltiers.
- 2x 12V DC ATX power supplies – providing the massive amount of current needed to keep all six modules running.
Each piece plays a critical role in keeping the system stable, and together they create a miniature cold-air tunnel that looks straight out of a sci-fi lab.
When it came time to test the build, the first challenge showed up immediately: running all six Peltiers on a single ATX power supply pushed it to the limit, and the PSU overheated to nearly 100 °C (212 °F). After switching to two ATX power supplies in parallel, the system finally had enough current to run stably. With everything powered up, the output air temperature dropped to around 13 °C (55 °F) — a surprisingly good result for such an inefficient setup. However, the water loop that was supposed to keep the hot side under control reached 48 °C (118 °F), showing that the small PC radiator simply wasn’t enough to handle the massive heat load. Still, even when the unit was left running without any adjustments, the output air stayed consistently at 13 °C, proving that the system could at least maintain its cooling performance over time.
Even though Peltiers aren’t practical for real-world cooling, it’s pretty fun to experiment with them — especially when you start chaining together six or more modules. It makes me wonder: what would happen if this Freezing Tunnel was scaled up two or three times bigger? Would the airflow get even colder, or would the inefficiency just multiply? The biggest question, of course, is whether this DIY AC could actually lower the temperature of an entire room. That’s something I’ll be testing out in Part 2 of this project, so stay tuned to see just how far we can push this idea. We also need to connect it to Solar Panels and cool the room for FREE.
Materials Used:
Radiator Tunnel:
https://s.click.aliexpress.com/e/_omzk21jWater Heat Sink:
https://s.click.aliexpress.com/e/_olxIkm5TEC1-12706:
https://s.click.aliexpress.com/e/_opgUFgNTubes:
https://s.click.aliexpress.com/e/_opLJPn3Links:
Old Working Laptops Shop:
https://tuempresainformatica.com/inventorsden-shop/And Here:
https://www.ebay.es/sch/i.html?item=205398835486&rt=nc&_trksid=p4429486.m3561.l161211&_ssn=inventorsdenEtsy Store:
https://www.etsy.com/shop/InventorsDenTikTok: tiktok.com/@inventorsden
Contact Me At:
alex@tuempresainformatica.com
Music Used:
Gaik - Street Away
Nomyn - Awake
Sappheiros - Embrace
DIY air conditioner, homemade AC, Peltier cooler, TEC1-12706 project, DIY cooling system, how to make AC at home, homemade air conditioning experiment