Amazon offers the Leviton Vizia 24-hour Programmable Indoor Timer with Astronomical Clock for $22.10 Prime shipped. For comparison, it has a list price of $60 but usually sells for around $30 online.

Use programmable timers: Set timers on your AC to automatically switch off during periods when cooling isn’t needed, such as at night or when you’re away from home.

Our Verdict. While more costly than some options, programmable timer switches or timer plugs for instance, the WeMo system is a worthy option, thanks to its simplicity and scalability.