A couple days ago, I discovered my furnace blower wasn't blowing. After a little push, it started. (I subsequently I discovered that squirrel cage fans will anemically move air in the correct direction when they are spinning in the wrong direction).
So I left the fan "on", and called a furnace guy and asked what to do with a furnace blower that wont start. He said I was lucky my 30 year old furnace was working at all and he could replace the whole thing for around $1400 or replace just the blower for around $700.
In a panic, I called my friend James, who used to be a pre-teen amateur HVAC enthusiast. "Oh, it's probably just the starter capacitor. Those things tend to die long before their motors burn out."
So for the cost of $6.50 (incl shipping via Amazon) and about 5 minutes of my time, my furnace is once again able to restart after a power outage, and my opinion of the HVAC service industry has dropped another 2 notches.