ESPERANZA DEL SOL
America's First Passive-Solar Low-Income Subdivision (1995)
This inner city Dallas group of homes, ranging from 1285 to 1450 sq. ft., had guaranteed heating cooling costs of $1 per day or less, averaged year round. Each home featured geothermal heat pumps (partially provided through a partnership with Texas Utilities) and a Life Breath air-to-air heat exchanger. The exterior envelope was 2 x 6 Optimal Value Engineered framing with either wet or dry cellulose insulation. Two of the homes, built specifically for clients with respiratory illness and allergies, had rockwool insulation and all hard surface flooring. All homes had thermal mass floors under passive solar windows, and daylighting assisted by compact fluorescent lighting, in all rooms. Sales prices ranged from $79,900 to $110,000.