HVAC
84 episodes
#6098: Herman In Brief: What Your Ethernet Port Lights Mean
Solid means link, blinking means traffic, color usually means speed — and the label on the box beats every rule.
#5914: Fire Alarms in 40-Story Towers: What Goes Wrong
How high-rise fire systems work — detection, smoke control, phased evacuation — and why burnt toast sends residents down 28 flights.
#5907: Rackmounting a Desktop: Size, Cases, and the Swap
How to move a working desktop into a 19-inch rack — sizing by rack unit, picking a chassis that fits your parts, and what the transplant costs.
#5882: Half of All Energy Becomes Heat. Now What?
Half the world's energy ends up as waste heat — but only 6% is worth recovering. Inside the cities that built the pipes anyway.
#5851: The Earbud Assistant Problem Nobody Solves
The AI model is solved. So why does the assistant in your ear still fail? The answer is the unglamorous plumbing nobody demos.
#5765: Why You've Never Heard of Schneider Electric
It's on your breaker panel, your UPS, and half the factories on earth — so why is Schneider Electric almost invisible?
#5740: Your Vacuum's Best Upgrade Is the Head
Most people use 30% of their vacuum's capability. The cheapest fix isn't a new machine — it's the nozzle on the end.
#5733: Why Your Raspberry Pi's Wi-Fi Keeps Dropping
The antenna on your Pi isn't the problem — where it sits is. What actually keeps an SBC link alive.
#5705: Tape Isn't a Pool: How LTO Really Works on Linux
Tape on Linux needs no driver — but it also doesn't behave like ZFS. Here's how LTO really integrates, and why "pool" means something else.
#5664: Rack Dreams: Getting Display and USB Across the Room
Display over fiber is the easy part. USB is where it gets annoying — and the single-UPS dream doesn't quite close.
#5656: Why a Headlamp Fails at Precision Electronics Work
A camping headlamp is better than nothing — but it's the wrong tool for board work. Here's what the specs actually say.
#5553: When 52 Volts Meets a 12-Volt Modem
A fried fiber modem raises the real question: where do you draw the line between preparedness and "done enough"?
#5541: Re-terminating a Keystone Jack After a Bad Ethernet Run
A DIY Ethernet run came up at 80 Mbps on 2.5G fiber. Here's what went wrong and whether re-termination is a skill worth learning.
#5521: Old Laptops as Home Servers: A Field Guide
That dead-battery laptop in your drawer can still serve. Here's the whole playbook — headless Linux, thermals, and the battery question nobody agre...
#5329: One Box of VESA Mounts, Three Wrong Assumptions
Daniel's box of orphaned VESA mounts raises three questions — and the answers all point away from welding.
#5221: A $66 Projector Screen vs a $2,700 One
A $66 pull-down screen and a $2,700 motorized ALR screen, same 100 inches. What actually separates a good screen from a lazy one?
#5203: Why LTO Tape Still Backs Up the Cloud
Magnetic tape isn't dead — it's holding up the cloud. How LTO-10 broke a 25-year compatibility promise, and why AI needs tape more than ever.
#5128: The 120 Hz Problem: Why Your Window Can't Stop That Jackhammer
A bedroom-shattering 120 Hz tone reveals why low-frequency noise ignores windows, mocks active noise cancellation, and demands real physics.
#5101: Drill Bits and Concrete: What Actually Worked
A 12V drill, a $20 bit set, and a reinforced safe room wall — what actually happened, and why the first bit failed.
#5061: Why Plastic Vapor Triggers Asthma More Than Sawdust
An asthmatic engraver discovers plastic vapors trigger his airways while metal and wood dust barely register. Here's why—and how to test your own t...
#5015: Plugs vs. Water: What Actually Keeps You Safe
Why bathroom and outdoor outlets fail, and what actually works to keep both you and your gear safe.
#4931: Building a DIY Barcode Inventory Cart
Old laptop, USB scanner, and Linux kiosk mode for a dedicated home inventory terminal.
#4883: Can We Cool Buildings Without Making People Miserable?
Why broken AC at Athens airport reveals a policy knot between sustainability and human suffering.
#4816: Can Your Body Learn to Tolerate a Swamp?
Why 32°C in Tel Aviv feels worse than 35°C in Jerusalem — and how fast your body can adapt.