Hi,i used the AGL energy coach tips and my results can be see here:https://tinyurl.com/y5kmk2s7AS you will see, one of the points at the bottom left states is:"Keep warm while cutting bills You’ll save energy when you heat only the rooms you’re actually using. So close vents in unused rooms to create zoned areas inyour home." So my outdoor central heating unit just got serviced, they found a cracked heater exchange which is letting carbon monoxide into the house via vents. The unit is 4 years in ...