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A comment on On whether changes in bedroom CO2 levels affect sleep quality. Parent comment

Re:On whether changes in bedroom CO2 levels affect sleep qua... by pkaye on Monday January 21, 2019 @03:00PM (#18963126)
Air tight buildings need a heat recovery ventilator.
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Re:On whether changes in bedroom CO2 levels affect sleep qua... by AstralStorm on Tuesday January 22, 2019 @01:01PM (#18970502)
Any ventilator. Heat recovery is optional - it is really hard to recover heat from lukewarm air without actually recirculating most of it.

The pressure drop requires more electricity due to more power in the pumps, making it a relatively bad trade - only heatpipe systems are worth anything.

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