A more environmentally friendly option would be heat fumigation, which mainly works by increasing the temperature to a high degree number that can no longer support most forms of life. This is about 140 degrees or more. Unfortunately, this procedure doesn’t work as well as lethal gas fumigation, since a house may not heat evenly.
Space treatment is another green alternative, which involves spreading liquid insecticide through the atmosphere but still contained within a structure. This is safer treatment and thus does not require evacuation or sealing. Contact variety of insecticides are used in most cases, as are supplies like foggers, misters and aerosol devices.