Since every one of us live with these heating and cooling units and they serve us every day of our lives, I admit that there are a few repairs we can handle. The bulk of the repairs, however, needs a professional. I have an air conditioning system workman that has worked for me for years! He is a professional, highly qualified, and has a wealth of experience, and over the years, my trusted air conditioner specialist has shared some of the work tips with me. Replacing the air conditioning system filters is something we can all do as property owners. The filters should be changed at least after 30 to 90 days. The expert got me the contacts of the local air conditioner corporation as I could get more stock of filters from there. As the experts know more about air conditioning from all the years working in the air conditioner repair industry, he advised that I schedule an air conditioner repair for the ductless multi-split unit at least every once or twice a year. I can also inspect the dial thermostat properly to ensure it is functioning correctly. The regulator should not be kept in direct sunlight as it messes up the readings, since the HVAC unit does not have vents, it is easy to look out for other problems that might plague the unit like improper air conditioner installation. The expert explained to me that new air conditioner units need a well-aerated place as it gets hot when in operation and the air would cool down the unit. As much as there are repairs I can handle it is still important to get a professional air conditioner repair service. The expert that works for me is from the local corporation and he also maintains commercial air conditioners in the commercial buildings around.