Some of the building materials in the house were "pre-tested" by MCS sufferers. Barry Karr, a past president of the Environmental Health Network and a self-proclaimed MCS sufferer, explained the testing process: "I was one of the sniffers. We would take things to bed with us. If we got up in the morning and felt terrible, forget it."
Despite the efforts of the builders, two-thirds of the residents claimed to be worse off than before they lived in Ecology House. Tenant Barbara Ruch, a fiction writer, told the San Francisco Chronicle: "They call it Ecology House... I would call it Pathology House. I have to escape this place." Tenant Mary Bussell complained that odor from the walls and cabinets made her chest hurt and her breathing difficult: "I can't even think in here. I feel like I'm going to pass out." Tenant Jan Heard agreed: "No one is able to sleep in their bedrooms [with their building materials]." One outspoken MCS sufferer, a self-described "refugee," told the Los Angeles Times that she chose not to live in the Ecology House in part because it was not built "on a bluff near the ocean."