2,330 sq.ft https://www.infoplease.com/askeds/us-home-size.html 1400 square feet another source that put the average at 2700 in 2009 National Association of Homebuilders http://www.infopleas...l#ixzz1tHYx98lo ballooned 2,700 square feet National Association of Homebuilders square footage of an average-sized house smaller than the average American home in the 1970s Info Please 1400 in 1970 another source that put the average at 2700 in 2009 Infoplease another source that put the average at 2700 in 2009 another source that put the average at 2700 in 2009 2700 sq ft today vs 1400 sq ft in 1970 another source that put the average at 2700 in 2009 the National Association of Home Builders 2700 sq ft today vs 1400 sq ft in 1970 the National Association of Home Builders 2,700 square feet in 2009 1400 square feet square footage of an average-sized house another source that put the average at 2700 in 2009 170-200 watts per panel http://www.infopleas...l#ixzz1tHYx98lo ballooned