My $20,000 Loss is Your Gain

TL;DR

Linus got a $1,300 thermal testing chamber working but can't keep it, so he's selling it at cost due to $250,000 permanent installation requirements.

Key Points

• 1.The Environics thermal chamber was bought for under $1,300 but costs far more to operate. Brand new units sell for tens to hundreds of thousands; Carmichael refrigeration got it working for under a tenth of the $4 million initial estimate.
• 2.The chamber required a custom water-cooling workaround since it's not air-cooled. The team used dumpster-dived cooling towers that lacked capacity, ultimately running cold tap water through and dumping the heated output — temporarily — into the garden.
• 3.One compressor had leaked its nitrogen holding charge while stored outside, contaminating the oil with moisture. Technician Stefan had to remove the oil and eliminate all moisture before the cascade refrigeration system could be recharged with R508B ultra-low-temp gas.
• 4.The original Windows XP control system was replaced with a Watlow F4 controller and a Raspberry Pi. This simplified the interface considerably, but the control tuning reduction means the chamber currently runs at about 80% of its original 1.75°C-per-minute pull-down speed.
• 5.The chamber reached -48°C on camera, well beyond its rated -73°C floor. Linus and Elijah entered at -22°C and experienced frozen nose hairs and mustache ice; the unit's former commercial life was validating solar panels for environments from Arizona to Antarctica.
• 6.Permanent installation would cost over $250,000 due to infrastructure requirements. A code-compliant room needs plumbing, fire suppression, noise treatment, and electrical work, plus roof reinforcement to handle up to 200,000 BTU/hour of heat dissipation via a large cooling tower.
• 7.Linus is selling the unit for what he paid plus transport costs. The gas must be recaptured and recharged by the buyer, but that cost is a fraction of buying a comparable new machine — interested parties are told to 'slide into his DMs.'