Hi the main circuit (between meter and first board maximum 2 meters away) 6 mm² minimum the thermal main board of 32A, you must also calculate cutting power but unless the house is very close to the transformer, the standard is 3 kA. Better 4.5 kA underground cable sectional circuit. We need to know the distance which directly affects the section of this cable. If the grounding goes on the pillar 3 x6 mm²; if you go in the house 2x6 mm² PAT cable 10 mm² two-color green yellow sectional board: differential circuit breaker 40A / 0.03A circuit thermics: tap circuit (maximum 15 mouths per circuit) 16A conductor 2.50 mm² light circuit: maximum 15 mouths per 10A conductor 1,50 mm² circuit AA circuit: for 2 airs of 3000 thermal 20 A 4 mm² conductors 6 mm² for the air is very much, you can use it but it is a waste As for the air. That's why you said you put 3,000 for not liking the cold much ... that phrase is not very well understood but for the doubts I clarify. The size or capacity of an air conditioner is not chosen to cool little or a lot. It is chosen according to the environment and its thermal load If you buy a smaller air than it should be so that it does not cool too much, what will happen is that the equipment will not perform and that will harm both the electrical consumption and the useful life of the device because it will work much more hours a large air and a small air cool the same because they work the same, the expansion temperature will be the same, but a larger one will do it more efficiently and less time comment doubts Cheers