How can you breathe clean air indoors? Your taste in decor changes over time, and even types of furnishings come and go. For example, these days TVs that mount sleekly on a wall have largely eliminated bulky entertainment centers from living rooms across the country. But for the most part, today’s typical home isn’t so different from those built several decades ago, particularly with regard to construction. Perhaps the biggest difference is that, against a backdrop of rising energy costs and growing environmental concerns, our homes have become more tightly sealed, thanks in large part to advances in building materials, especially insulation and windows.
