Using a blower door–a device that sucks the air out of your house to simulate an especially windy day–is the best way to identify where your house leaks. For many of us, a thousand little pin pricks in your home may add up to a hole in your house the size of a window left open 24 hours a day, 365 says per year. This is exactly what an untreated attic ladder hatchway does. So consider fixing this first with attic zipper..
By using a blower door in coordination with air sealing, we can identify the biggest leaks and get them sealed.
This video from Green Building Advisor shows how it’s done.