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Hi, Since my parents moved into their new apartment, my mum has insisted in turning off the central ventilation system as she doesn't like the noise. I am sure it is partly also because she thinks it saves money and likes turning things off. Frequently I have gone to their apartment and found the air very stuffy. Today they called me and said that the CO2 monitor in their bedroom was red showing a high of 1664PPM over the last 24 hours and an average of over 1200. They haven't been feeling great for the last couple of days. Apparently my dad wanted to put the heating on and instead my mum closed all the window vents as she believed they were making it cold, thus the flat was totally sealed up. Would this CO2 level just be due to a lack of ventilation or should I worry about something else. They have been robustly told to stop closing all the vents!