Thermostats should be set between 25–27°C. Every 1°C lower can
increase running costs by up to 15% or cost you for repairs because they
do like a break every so often.
If there is a hot day forecast, then pre-cool your house the night
before. This is especially effective if your house has a high thermal
mass such as solid brick. This will allow your air conditioner to work
at its optimum during the cool evening, saving power and wear and tear
on the unit. It also allows the unit to keep on top of the heat load as
it begins to warm up during the heat of the day.
