If you live on a cold country the recommendations are similar. ERV for air exchange so you got fresh air, humidifier rather than dehumidifier, and heating a geothermal heat pump. No need for air purifiers if air outside is good, the ERV with filters is enough.
Also important is to have a house that is decently sound insulated. Soundproof interior doors, dissimilar glass windows, decoupled walls with good insulation..
All those things are the most important when designing a comfortable house.