We all put our phones in our pockets, but in this heat, the sweat and moisture in your pocket are really bad for your phones. The solution – put your phone in a silicone case. At the very least, keep the case-side of the phone toward your skin. Another great old-school solution – a Ziploc bag. If you're gardening or going out for a run, slip your phone in the bag to protect it from moisture.
Heat and batteries do not work well together. Keep your phones and computers out of direct sunlight when it's hot. Don't leave your laptops running on the couch or a cushion – it can't expel the hot air. You can also use Cool Feet Laptop Airspace Stands to prop up your laptop so it can vent – they cost about $11. Or you can use the Belkin Laptop Cooling Pad. It's $30, has a fan and USB port built in. If you use your computer on your lap, it will keep you cool, too.
Find out more about each of these tech gadgets at Amazon.com.