In the foreground, Gary Rawlings, lead energy auditor technician at Lantern Energy, shows Bill Nelligan, director of environmental health, safety and sustainability, a gap between the register and air duct at 24 Fountain Avenue. The space allows cold basement air to seep through the vent.

In the foreground, Gary Rawlings, lead energy auditor technician at Lantern Energy, shows Bill Nelligan, director of environmental health, safety and sustainability, a gap between the register and air duct at 24 Fountain Avenue. The space allows cold basement air to seep through the vent.