Why does my air conditioning system have a funny smell?

If you're running your system for the first time for a Spring/Summer season, there is an issue, known as "dirty sock" syndrome. This is when the evaporator coil has sat all Winter, stagnant and it will have a "dirty sock" smell when running it for the first few times at the beginning of the season. This smell should go away after 2-3 run times, if not call your air conditioning company. If the smell is electrical/burning smell see question #11. If the smell is of a dead animal you'll also want to call your air conditioning company or exterminator. Squirrels, mice, rats...they all love getting into the tight spaces and maybe couldn't find their way out.