Proper Attic Ventilation
1. Don’t use fans, turbines, or any ventilation system that has moving parts. They will fail sooner rather than later, probably don’t really work like you think they might, and are just costing you money.
2. Use a soffit and ridge venting system. If properly installed, this is the best way to go. It is relatively inexpensive to install in comparison to the return you’ll get from electrical savings and a more comfortable home.
3. If you have a hip roof with few or no ridges, gravity feed or hood vents are a good option, but only if enough are installed. A professional roofer or contractor can calculate the volume of the air in your attic and determine how many soffit (intake) and hood (exhaust) vents are needed to turn the air 12–15 times per hour, which is what is needed to effectively cool your attic. The hot air in the attic rises and escapes from the ridge or hood vents; the air is replaced with cooler outside air that gets sucked in from the soffit vents. Always make sure the soffit vents aren’t blocked.
4. Get a remote thermometer and put the sensor in the attic and monitor it. This will help you understand the heat fluctuations and help determine what, if anything, needs to be done. Your attic should never be more than 20 degrees hotter than the outside temperature. In the winter, it should be roughly the same temperature as outside. If it is warmer than that, you are losing a lot of money and home comfort.