Various embodiments are described herein for an environmental control system. In one example embodiment, the system is an HVAC system including an HRV or ERV unit, a first distribution system, and an ambient energy distribution system. The first distribution system has a first end in thermal communication with the HRV or ERV unit and a second end in thermal communication with the interior of a domicile. The ambient energy distribution system extends between first and second locations in the domicile and is isolated from fluid flow communication with the first distribution system. The ambient energy distribution system transfers heat between the first and second locations.