I was wondering how much trouble it would be to add an economizer to my reidential HVAC. I live in the NC foothills and the temp in the summer varies between the 90s in the day to the 60s at night. I currently take advantage of this by closing off some of the internal doors in the house to partition the the air return from the rest of the house and open some windows. This draws in the cool air and chills the house down nicely so the HVAC usally dosent come on again before 1 or 2PM. Basically I am looking for a way to automate the daily procedure and elimenate the possibility of rain being blown in an open window the way it did the other night. Could this be done as simply as having a thermostat open a damper to the return air or would I need a special controller to do this ? The controllers at work have inputs for indoor and outdoor temps and humidity, hydrocarbon detectors....hopefully I want need anything this complicated or expensive.
Jimmie