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Air Quality
Indoor air is often more polluted than outdoor air, but improving it is mostly free. Ventilation, dust control and — optionally — a HEPA purifier make a real difference to how a home feels.
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Open your windows daily to create a cross-breeze, and damp-dust regularly. Both cost nothing and clear indoor pollutants effectively.
If you have allergies, pets, live near traffic, or can't ventilate easily, a HEPA purifier is a worthwhile upgrade — especially in bedrooms.