There are a few ways you can make your air conditioner colder in your house without adjusting its thermostat setting excessively low. Firstly, ensure that all windows and doors are closed tightly to prevent warm outside air from entering your home. Consider using reflective films on windows to block out excess sunlight and reduce heat gain inside the house. Insulating walls, attics, and ductwork can also prevent cold air loss and aid in maintaining lower temperatures indoors. Finally, if possible, avoid activities that generate additional heat indoors during hot periods, such as using ovens or running multiple electronic devices simultaneously. These measures combined should help make your air conditioner cooler in your house without putting excessive strain on the system or driving up energy consumption.