[Shop-talk] Hot air furnace parasitic loss

[David Scheidt]

On Sat, Oct 4, 2008 at 8:14 PM, Pat <Pat at hornesystemstx.com> wrote:
> JP,
>
> Probably what you are hearing is the control transformer in the furnace.
> Your thermostat  and controls runs on 24V. There will be a small amount
> of eddy current loss in the transformer, but that's about it.

Probably 10 watts or so.  (If it's old, maybe lots more.)  That's on
the order of 80 kW hours over the course of a year.  If it doesn't
need to be on six months of the year, that's 40 kWh.   That's $4 at my
electric rates, give or take.



-- 
David Scheidt
dmscheidt at gmail.com