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Catalin (@catalinmpit) installed a heat-recovery air ventilation system in his…

2026-05-10 · 22:48 UTC ·@levelsio ·1 min read

Brief

Catalin (@catalinmpit) installed a heat-recovery air ventilation system in his new house after seeing @levelsio mention CO2. It runs non-stop, swapping stale indoor air for filtered outdoor air (dust, pollen, particles), producing a crisp 'mountain morning' feel and removing bedroom morning stuffiness; he now wants a CO2 monitor to quantify effectiveness.

Why it matters

Catalin (@catalinmpit) installed a heat-recovery air ventilation system in his new house after seeing @levelsio mention CO2; the post was published 2026-05-10.

Key details

  • The system runs non-stop, continuously removing stale indoor air and bringing in filtered outdoor air (filters dust, pollen, and other particles), creating a 'crisp, fresh morning-air' feeling and eliminating bedroom morning stuffiness.
  • He now wants a CO2 monitor to measure and verify the ventilation system's effectiveness.
Source evidence

I want this!

Catalin (@catalinmpit)

I’ve seen @levelsio and others talk about CO2, so I installed a heat-recovery air ventilation system in our new house.

It runs non-stops by removing stale indoor air and bringing in fresh outdoor air. It feels like always having the windows open, but better because the incoming air is filtered for dust, pollen, and other particles.

The best way I can describe it is that the house has that crisp, fresh morning-air feeling/smell you get when you open the windows in the mountains.

And the most noticeable is the bedroom. You know how bedrooms feel stuffy and smell bad in the morning. Not anymore. It’s fresh when we wake up.

Now I need a CO2 monitor to monitor its effectiveness.

— https://nitter.net/catalinmpit/status/2053496756344901941#m