Kathu is a county in Phuket province. Phuket is an island. There is also a town called Phuket. We lived in 4 places while in Phuket for 2 years. Phuket is one of many provinces in Thailand. Thailand is the size of California. Phuket is 8 degrees above the equator, so it's hot except for the position as an island which gives it cool breezes. The country is subjected to monsoon weather. If you can't stand rain, don't visit during the monsoon season.
All the places we stayed in were concrete construction. That is actually good for cooling. The walls always had geckos up near the ceiling. We got used to their presence. At our pool house, we had a small pond which had loud frogs. We also experienced great drama when cats tried to get a baby bird that was in a nest next to the pond.
Most places had room air conditioners placed in the main room and a bedroom. They are built into the wall of the room, not in the window itself. I mentioned the concrete construction earlier partially because there are termites. A leg of a chair at my school was eaten up by termites.