Home Design Guides: Sustainability, Energy and water management, Energy efficiency
The outside edges of an exterior door in particular can make a significant contribution to your home's overall energy efficiency. See how draught stoppers, weather strips and sweeps can make a difference.
In most plumbing setups, it takes a while for hot water to reach the hot tap when it's turned on. Cold water diverters recycle the cold water which would otherwise pour down the drain in this time.
Air conditioners come with labels these days that indicate how efficiently they're able to cool (and to heat, if they're reverse-cycle models). Find out more about these labels and what to look for.
Depending on where you live and what electrical hardware you have, your local power authority may be able to control your lighting or appliances to prevent blackouts.
Just because water from the tap has been used, it doesn't mean it can't be used again. See how grey water systems can help reduce your water waste.