On Thu, Sep 16, 2010 at 2:15 PM, Randall <tr3driver@ca.rr.com> wrote:
>> At our new office I found out that the "emergency" heat came on when
>> there
>> was a more than 5 degree difference between setting and temperature.
>
> I was checking some thermostats on-line, and that appears to be the way most
> older ones work.
>
> Seems like it would be trivial to make a more intelligent decision (like
> looking at the temperature rise over time and only cutting in the backup
> heat if the heat pump can't raise the temperature inside the house), but I
> didn't find any thermostats that worked that way.
I'm pretty sure white rodgers sell some that work like this, at least
in principal. ( I know they make units that have an outside
thermometer, and can inhibit the secondary heat if the temperature is
above a a set point. (so you can set it to an outdoor temperature at
which you know the heat pump will eventually reach the inside set
point, even if it takes a long time.) )
--
David Scheidt
dmscheidt@gmail.com
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