On Sep 11, 11:14*pm, Tony Hwang wrote:
allanc wrote:
On Sep 11, 10:41 pm, "Bob M." wrote:
"allanc" wrote in message

....

It's a mechanical type.
I will take the cover off tomorrow in the daylight and try to get the
model number.
The unit is probably decades old.
Do you think the manual would actually have troubleshooting tips such
as when the temperature is off by 8 degrees?
Mechanical thermostat? *Don't bother fixing it. Get a programmable
electronic one & save big money.

Someone once told me that in his opinion, there was a point of
negative return.
For example, in the winter, if you turn down the temperature *too* low
at night, the cost of warming the house to the daytime temperature
would exceed the savings that you obtained at night.

Comments?

Hi,
That is not so. All the testing done shows 5 to 15% energy savings.
Many digital 'stats have some intelligence. It does not work in linear mode.- Hide quoted text -

- Show quoted text -


It is the opinion of one of my brother-in-laws.

If we take an 'extreme' example of comparing during a cold winter:
1. allowing house to cool from 70 (F) to 68 (F) overnight (11 pm to 7
am) and then returning to 70 (F) during the day.
versus
2. allowing house to cool from 70 (F) to 50 (F) overnight (11 pm to 7
am) and then returning to 70 (F) during the day.

Will the actual cost of energy be less with #2?
Wear and tear on the furnace,etc would be a separate issue.