hauolihale

I live in Phoenix, where the warm weather is quite brutal. As a real estate agent, I take my clients to show homes in my ES350. It would be great if I had my Lexus locked and still running so the AC keeps the car cool while we are looking at a home. Anyone have ideas on how I can have this feature....I understand I have to go to an off market car alarm service to have this feature installed. I don't want to do this and jeopardize the integrity and quality of my Lexus.