> Assuming that you have normal heating and ac systems, it is going to
> be far more expensive to keep them going overnight.

> You should be using an optimum start controller to get the desired
> temperature first thing in the morning regardless of outside
> temperature.

> The Carbon Trust have some good concise publications that can help,
> try starting from here:http://www.carbontrust.co.uk/
> and go to publications

> Also you might be able to get free advice over the phone from the
> Energy Savings Trust:http://www.energysavingtrust.org.uk/help_and_support

> You might also check to see what your local council is doing to
> provide help and support.

> John