If you send an email to IFTTT then switch on your air conditioner using Sensibo

Create custom workflows effortlessly by selecting triggers, queries, and actions. With IFTTT, it's simple: “If this” trigger happens, “then that” action follows. Streamline tasks and save time with automated workflows that work for you.
5 triggers, queries, and actions
Send and receive important information when you need it, automatically, with this service. The "send me an email" action has a daily limit of 750 messages per day, at which point Applets will be paused until the limit resets at 12:00 AM GMT.