There is always a great time to be cautious. This is tplot when you are driving, going to a new locale, traveling on your own or taking care of your house. I know that I actually like to be cautious when I take care of my Heating and Air Conditioning system. I hate going to work everyday. My condo is where I get to relax and unwind to get ready for the next DA. I want to be cheerful in my home. I find that I cannot be cheerful in my condo if the Heating and Air Conditioning system is not working. How can you be comfortable in a condo that is too warm or too cold for your liking. If my Heating and Air Conditioning system were not working I would be tied up out about having to get it fixed. This is the last thing I want. I am absolutely cautious about taking care of my Heating and Air Conditioning system. I take every precaution that I can to ensure it is always working. I get proper tune ups. These tune ups fall in the fall and in the Spring. These are the best times because they are weather drastic transition times. You get your heating system and air conditioning cleaned and ready for the next season or get it easy for when the next season comes around. Another precaution I make is to change the air filters every month. I do this to prevent the system from getting clogged up. If I do not change the sir filters the system may shut down. It also means that there could be dirt getting through the filter into my condo and I do not want that. If I suppose something may be wrong I can also feel free to contact my local Heating and Air Conditioning business.