Fill an inexpensive spray bottle with a mix of 20% dish soap and 80% water. Use it to mist large items you need to hand wash (cookie sheets, baking pans) with soapy water, and they'll clean right up. It's also great for greasy counters or stove tops. A light spray will dispense just the right amount of soap to whisk away the grime.
Polystyrene foam is a good choice if you have plants that might need moved for sun exposure. Fabric planter bags and fiberglass are also good lightweight choices.
Your food crops will produce more if you harvest often. Pole beans, zucchini, and similar crops love to put out for you. Share your excess and your neighbors will love you.
Even curling irons, stereos, and televisions add to the heat load your air conditioner must cool. The more electrical appliances you can avoid using during the hottest part of the day, the less hard your air conditioner will have to work.
Attics can reach 130 degrees or more on sunny summer days. Check your weather stripping around your attic entrance. Heat can break down the rubber. Replacing it is easy with a repair kit from your big-box home store.