Use vinegar instead of fabric softener. It works really well on towels and nappies, and I use it for everything. Add a couple of drops of Eucalyptus oil or Lavendar oil to the wash for scent.

Wash bigger loads less often than washing every day. Put a bucket or the plug in the tub when you shower and use the water to put on the garden, or save it for the loo (but don't do what my ex did and have 8 buckets in the ensuite).

Open the curtains on the west side of the house to make use of the warm sun.

Iron as you need rather than doing it all at once, clothes can crease in the wardrobe.

Use a plug in heater only when its really cold, use blankets more often than a reverse cycle AC. Close up all the rooms you aren't in to keep one room warmest.

Make sure the vacuum is always empty when you use it, it uses less power than when full.