I live in Colorado, and the weather is starting to warm up. In a couple months, the temperatures will rise pretty high. Thankfully, I have a well insulated house (there is over 20 inches of fiberglass insulation covering the entire floor of my attic) that keeps me nice and warm during the winter for relatively low cost. Conversely, that excellent insulation makes maintaining a livable temperature very, very costly during the summer months, despite Colorado's rather moderate summer weather (in the grand scheme of things.) I would keep my windows open, however I am just close enough to busy roads that keeping windows open is an impractical solution during the night (which is really when I need things to be cool.)
I have noticed a variety of venting systems that can be installed in homes, involving foundation vents, intake vents, and attic venting systems. From all the information I've been able to find, it sounds like such a system can greatly reduce the energy costs required to keep a home cool during summer months. I have some concerns however, since I live in a well-seasoned state where winter temperatures can get down to around -15°F.
Given the seasonal temperature dichotomy, would it be wise to install an attic venting system? If so, what is really necessary for the whole system to function? I am not sure if intake vents are necessary, and if they are, how they might affect the insulation of my house during sub-zero winter weather.