When you have reached the limit of your unit because of extreme heat, should you just throw in tht towel and turn the thermostat up. My unit will hold 77 until about 3:30. Then it will go to 79 and stay there until about 8:30. We have extreme heat at the moment, around 111 today. Im well over my design temp. My system is running all day long now and wonder if that is bad for it? I thought it might just be better now to set it at 80 and wait for this extrem temp to move on. Every one in my area is posting that there system will not keep up.....so I assume it just because we are so much over our normal highs. I have a 4 ton 16 seer Carrier Infinity heat pump.