The ideal temperature to set your air conditioning while you're away on vacation in July and there are no animals at the house is around 85 degrees Fahrenheit (29.4 degrees Celsius). Setting the temperature at 80 degrees (26.7 degrees Celsius) or higher will help save energy and reduce your electricity bill while still preventing the house from becoming uncomfortably hot.
If you turn off the air conditioning completely, the indoor temperature could rise significantly, especially during the hot summer days. Extremely high temperatures can lead to various issues like mold growth, damage to electronic devices, and potential heat-related damage to furniture or other items. Additionally, turning off the air conditioning completely can make it more challenging to cool down the house quickly when you return, which may lead to discomfort during your first day back.
By setting the temperature at around 85 degrees, the air conditioner will kick in periodically to maintain a relatively stable indoor temperature. This will help preserve the condition of your home while still saving energy during your absence. Keep in mind that individual preferences and local climate conditions can influence the ideal temperature, but 85 degrees is generally a good starting point for most situations.