The time required to cool your home by 5 degrees using the Nest air conditioning system depends on several factors, including the size of your home, the current temperature, insulation, and the efficiency of your cooling system. However, I can provide you with a general guideline.
On average, air conditioning systems can cool a home by approximately 1-2 degrees Fahrenheit per hour. So, if you want to cool your home by 5 degrees, you may need to turn on the Nest air conditioning system at least 2-3 hours before you plan to come home. This estimate assumes that the outside temperature remains relatively constant during that time.
Keep in mind that this is just a rough estimate, and the actual cooling time may vary. Factors such as outdoor temperature, humidity, and the condition of your cooling system can affect the cooling rate. It's always a good idea to experiment and adjust the timing based on your specific circumstances to achieve the desired temperature when you return home. Additionally, using features like Nest's learning algorithms and scheduling capabilities can help optimize the cooling process based on your preferences and patterns.