I Have Strong Feelings About Air Conditioning in the Tech House

Video summary

Linus installs five mini-split heat-pump cassettes at the Tech House for about C$15,000, gaining independent room-by-room climate control.

After the Tech House’s uninsulated upstairs became unbearably hot, Linus chose a mini-split heat pump over extending the existing furnace ducts or relying on window AC units. The system uses five ceiling cassettes, each providing 9,000 BTU of cooling or 12,000 BTU of heating, with inverter controls that adjust output and remove humidity. The video follows installation, copper-line flaring and torqueing, and a nitrogen pressure test that reveals and fixes a leak. The outdoor unit can serve all five zones, though the house must run in heating or cooling mode as a whole. After commissioning, its preloaded 6.5 pounds of refrigerant proved sufficient. The full setup cost about C$15,000 (US$11,000), which Linus says compares favorably with a ducted retrofit; he celebrates finally getting cool air at the Tech House.

Chapters

1. 0:00Intro: Linus chooses a mini-split heat pump for the 32–33°C Tech House
2. 2:17Spec'ing mini splits: 9,000-BTU cooling and 12,000-BTU heating cassettes modulate to demand
3. 3:39How it works: Reversible refrigerant flow and condensation drainage in the ceiling cassette
4. 5:02Mounting: Fit the cassette between joists, align after drywall, and use its washable filter
5. 8:08Connecting the lines: Flare nitrogen-protected copper and torque fittings to 10–13
6. 12:14The condenser: Five independently controlled cassettes and operation down to −15°C
7. 14:36Looking for leaks: Bubble-test the fittings and reach a 104.7-PSI hold
8. 16:11Feel that frosty air, boys: C$15,000 mini splits deliver five zones but share one operating mode

What the full analysis includes

8 chapters · 34 key points · 8 section summaries · mind map

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