Proper maintenance of the air conditioning guarantees its optimal operation and prolongs the useful life of the equipment, as well as helping to save energy and prevent the accumulation of bad odors and humidity. Cleaning the filter, cleaning the battery in the outdoor unit and checking the refrigerant gas levels are the three basic pillars of air conditioner maintenance. To these should be added one more, protection in times of prolonged downtime, which implies a review and general cleaning of the equipment at the beginning of each season (before summer if we use the machine in cold mode and before winter if we use cold mode hot). Air conditioning maintenance: cleaning the indoor unit Cleaning the indoor unit ensures good maintenance of the air conditioner. The process is quite simple and involves both cleaning the exterior of the split and the filters and drainage of the unit. The objective is to prevent dirt from accumulating inside the machine, hindering its performance, caus