Americans have a reputation for being careless about air conditioning. Energy is a limited and very expensive resource. You make points by adopting passive energy techniques that have worked for centuries. The thick walls keep cool air inside. Windows and door shutters are shut during the day to keep the house cooler. You open the windows at night to let air circulate.
Mosquitos are a nuisance at best. Solutions are few, but there are things you can do. Buy a little burner in any hardware store, but use the citronella-coated non-hazard plaquettes instead of the insecticide ones.