On Dec 19, 2013, Phil wrote
(in article ):

Hi. I am in the process of completing a home-brew central heating
controller which will be able to measure the temperature outside of the
house as well as in 3 rooms inside.

Our house faces north/south and I plan to mount the outside sensor just
under the eaves but do I mount it on the northerly side or the
southerly?

Obviously, the northerly side never sees the sun but I am concerned that
the sensor may be affected by stored heat, or should that be cold so,
has anyone got any advice please?


Temperature always varies a lot around heated buildings. If you really need
to measure the true ambient outside temperature accurately you need to
construct (or buy) a proper Stevenson Screen and mount it some distance away
from your house. The official recommendation is a distance of twice the
height of the building (or so I believe).

--
Mike Lane