My unit runs continuously and doesn't turn off. Sometime the vents are blowing warm air but the majority of the time it is cool air. I had someone come look at it and they said the compressor isn't working. He said we can't buy a new compressor because the unit it too old, therefore, we have to buy a new unit. My light bill has more than doubled. What should I do? And if I don't get a new unit now, will the air still work during the summer?