Either a horseshoe used for pitching, or the real thing, can provide you a handy carrying device when moving cement blocks. To use, insert one prong into the block's hole; it will balance neatly on top of the prong. A 6-in. piece of rubber hose slit lengthwise and slipped over the other prong will give you a comfortable handle to grip.
Be sure the thermostat is set in the cooling mode. Just setting the dial below room temperature will not activate the air conditioning if it is set in the heat mode.