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Furnace Thermostats; how can I limit high temp to 70 degrees?

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Posted by ghelf on November 30, 2010, 7:31 am
I have a rental house up in the Lake Tahoe area and tenants often crank up
heat to 90 degrees. They will leave after their stay and the furnace is
still trying to maintain 90 degree temperature and is costing me big bucks.
Is there a thermostat that would allow me to set a maximum temperature?

Posted by Morris Dovey on November 30, 2010, 2:10 pm
On 11/30/2010 1:31 AM, ghelf wrote:

Set a second (non-electronic) thermostat to the maximum temperature you
want to allow and glue the adjustment lever/wheel in place. Install it
in series with the existing thermostat in a location where it won't be
found, but can still accurately sense the indoor temperature.

Morris Dovey

Posted by Morris Dovey on November 30, 2010, 2:15 pm
 On 11/30/2010 8:10 AM, Morris Dovey wrote:

Disregard (I need more coffee)

Morris Dovey

Posted by Michael B on November 30, 2010, 2:48 pm
Not an unreasonable answer. As a housing inspector,
I've seen it done, and I understand. The more appropriate
answer, IMO, is to have the utility in the occupant's name.

Posted by m II on November 30, 2010, 5:46 pm
 On 10-11-30 07:15 AM, Morris Dovey wrote:

Nothing to be ashamed of.

I knew people who did that. They lived on the second floor of a house
that had the thermostat on the main floor and the furnace in the
basement. The main floor was rented out.

The top floor would get insanely hot.

They wired a top floor thermostat in series with the main floor one,
allowing heating only to the top floor maximum setting.

The only drawback I can see is that in many forced air systems, there is
a resistance element in the thermostat. It's called an anticipator. The
little wiper arm on it has to be set to the current capacity of the
furnace. It helps to prevent an 'overshoot' of the setting when the hot
air vent is across the room from the thermostat location.

It may be a good idea to use a secondary thermostat without the
anticipator resistance.


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