Does anyone have a decent how-to for the DIY'er to perform their own seasonal air conditioner maintenance? I'd like to tackle most of the maintenance work for the A/C just as I did for the furnace last fall (open, inspect, clean out any dust, etc...), but am unsure exactly what to check.
There isn't a heck of a lot you can do without gauges and specialized tools.
One thing that will make a big difference is cleaning the unit's coils. Shut off its power at the breaker or disconnect, remove the cover, and use a gentle hose stream to remove leaves, dirt, and debris from the fins. It will be more efficient if it is clean.
As far as actual servicing and routine maintenance, I'd say you'd better call a pro.