Frank Stearns wrote:

I hope I addressed those concerns by getting a smart enough CPU...

You might use a $100 Norhtec 2.5-watt mcjrxs 486 clone with Ubuntu linux
(free) on a $10 1 GB compact flash ram, with a DS9490R USB-1-wire adapter
and some $2 Dallas DS18B20 12-bit 1-wire temp sensors and a $48 Systronics
8-1 output board with OWFS, and program it in bwbasic.

You can calculate dewpoints and economize with a humidity sensor like
Aagelectronica's $48 TAI8540D and a foamboard damper made with a $10
used windshield wiper motor, and ventilate as needed with a $300 GE
8002 CO2 sensor.

... as long as your responding to the posts, perhaps you could take
a stab at the original questions, if so inclined?

Don't hold your breath, waiting for Bubba's constructive help :-)

Nick