If we did away with all the machines there would be more jobs...of course many of them would be hand sewing clothing and standing behind a plow...and people would live lives of poverty and hardship.
Perhaps its better to continue the work of the Industrial revolution and allow people to rise to the challenges as they have done throughout history. I applaud Carrier for pursuing a business model that will allow then to remain in America, with American workers, and keep pricing in line so Americans can buy air-conditioners. If the business improves productivity they can expand and keep those workers overseeing, repairing and directing those machines and much more.
Please note that what Carrier was going to move was a furnace plant, not an a/c plant. I am not sure where they manufacture a/c units.