Summary:Now House is a process for retrofitting existing older houses to become net zero energy homes. The retrofit includes renewing or upgrading foundation walls, basement floor, roof, exterior walls, windows, electrical systems, lighting, HVAC, ventilation and water heating. The first application of the Now House process was to a 60-year-old wartime house in Toronto, which is similar in layout and footprint to a million other houses in Canada where the process could be replicated. Already the Toronto house has acted as the prototype for the retrofitting of five similar houses in Windsor, Ontario, that are owned by a social housing agency. The original Now House re-skinning and retrofit resulted in energy savings of approximately 70 percent per year for the existing bungalow.