Maintenance
How to fix a leaking tap
Most of the time, if a tap in your home is leaky, dripping or hard to close it's the result of a broken washer. While it's possible that your leaking tap's a 'washerless' tap (i.e. one with a ball, cartridge or ceramic disc mechanism - see the 'Types of taps' article linked below), it's a lot less likely that these taps will be leaking like this. You can usually tell if you have a ceramic disc type tap because it'll only need a quarter or half turn to fully open the tap.
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Age of wiring
Like all things, over time wiring and the shielding that surrounds it tends to deteriorate. See how this affects the safety and performance of your electrical systems.
Which cooling systems are most efficient?
If you need to artificially cool your home, it's well worth considering how much that'll cost, and what kinds of options you have. Air conditioners are effective, but they're also very energy hungry...
Types of ventilation
There are many different ways to move air in and out of houses (or parts of houses). Find out more about different vents, and different ways to ventilate a home.