I have had it for 1 month, I bought the 18 for more warmth but it doesn't perform well at all at 21 degrees, it doesn't stop at all. And the house is fully insulated with an external temperature of 15 degrees during the day and 10 degrees at night, and it still hasn't gotten cold. I have no opinion on cooling. It is 45 square meters. Choose something else, not the 18 TCL. I will complete the comments, the machine does not have an internal filter but it has one on top, only TCL has this and it is the worst thing TCL has produced, so I opened the lid, the internal one, and I have it permanently open and it works very well now, it just needs constant cleaning since I opened the lid. Finally, the house is getting warm and it blows very hot air, but if you close the lid, its performance drops by 70%. Until May 4th, it has cost me 460€ with everything in the house, kitchen, water heater, so proportionally, the electricity bill is around 120€ for the cold month.