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1 Dwelling with 3 flats need air conditioning unit

I have a 2 story house made up of 3 flats. 2 flats are on the second story. I need a quote for getting the 3 flats to meet the healthy home standard for rental in terms of the heating perspective. I am open to any solution either ducted or splt system etc. main thing is each flat will have it's own power supply. The total house size is 300 square meters. In order to get access to the house I will need 1 days notice and an exact time as I will need to sort out the access with the realestate person.