Hi .How can I help you in the installation of your AC . Since your home consists of only three rooms ,load calculation is not that difficult to calculate. provided you indicate room size ,walls and ceiling materials used ,glass windows size ,how many windows per room , maximum number of occupants ,number of lighting fixtures. Size/Capacity of your AC shall be determined from the calculated load then you can select which type of AC do you prefer (i,e, Split Typr , Package Type )depending on your budget.
Would appreciate if you can contact me to help you in any way I can assist your needs
Regards