I recently hired a cleaning crew to come in and deep clean my house. My house was really filthy from over a year of no cleaning in it. I have a very busy schedule which is why it got this bad. Calling the professional cleaning company to send a cleaning crew was my best option. This cleaning company was really great. In addition to the basic deep cleaning in the house, they also cleaned my central heating and air conditioning unit in my backyard! I could not believe it! They actually cleaned the central heating and air conditioning unit as if it was a piece of outdoor furniture. I could not complain since it did not cost me any extra, and plus with the central heating and air conditioning system unit itself being cleaned it was actually reducing the risk of some of that dirt and grime getting into the fan or motor of the central heat and air conditioning unit. That could cause some serious problems and possibly even cost me to have to get a brand new central heating and air conditioning system unit. So I really thanked the cleaning crew for taking care of that. I would have never thought to clean my central heating and air conditioning system unit on my own. It is one of those things that just slips your mind because it is not part of your household indoors. I actually gave the cleaning crew a cash tip for doing this for me. I did not have to do this, but I felt it was something I should do to say thanks for going the extra mile!