Greenterrafirma.com has a great article on a DIY solution for a blower door test as an alternative to the professional done test. Their solution is basically to turn on all the exhaust fans in the house and go around with an incense stick or a wet hand to see or feel drafts. They explain where to look for leaks as well so you aren’t randomly running around your house with an incense stick.
Its definitely not the quickest way to do things, but its a heck of a start that’ll get rid of the big leaks. Its also way cheaper than having a professional come out to do an energy audit for a couple hundred dollars. I know I’ll be trying this out in my leaky old farm house.
Update: The test has been done. Check out the Home Air Pressure Test Results here.