On Tue, 11 Dec 2007 02:48:04 GMT, Edwin Pawlowski wrote:

wrote in message

Nonsense. Any setback saves energy, no matter how short.

This is 300-year-old high-school physics :-)

Nick

Is there any limit to what the setback temperature should be?

Freezing. If you can't feel the difference, let it set back to 35-40 degrees.
You don't want it to get cold enough to burst the plumbing.

I personally prefer something above 60 at night.