"Reason" wrote in message news:9tKwc.21435$B%4.2651@clgrps12...

I haven't needed to fire up my air-conditioner much since I installed
thermostatically-controlled window fans that draw cooler air into the house
to a preset temperature. They really do cool the house a lot. When it's
really hot, the fans work most of the night cooling down the house for the
next day, and then other forms of cooling aren't really needed until later
in the day.

That's what I want. But really the requirements are rather more
complex than that in this building. Multiple temp zones, and its more
complex than just differential thermostats needed.

The ideal would be say a BBC puter to take in multiple temp readings
and control the system, but I'll never find the time.

Regards, NT