Nobody would deliberately choose to live in an home that is uncomfortable or bad for their health. But people do.
A "healthy" home: has a humidity level that prevents dry throats and does not encourage mould; is free from toxic materials; offers good quality light either from the sun or electic lighting; is not too noisy; is without unwanted draughts and a comfortable temperature.
A number of techniques or approaches have been used by a number of Green Doors householders to make their homes healthier. These include: management of air quality through ventilation systems; selection of natural building materials when insulating particularly internally; avoiding the use of Volatile Organic Compounds (VOCs) in synthetic paints, PVC products or formaldehyde adhesives that don't emit pollutants.