Symbol Pb A soft, easily shaped, heavy, bluish-gray metallic element that is extracted chiefly from galena. It is very durable and resistant to corrosion and is a poor conductor of electricity. Lead is used to make radiation shielding and containers for corrosive substances.
When trying to cool a typical house, the average central AC will only decrease the temperature by about 20 degrees. For example, when it is 100 degrees outside, the inside will typically cool to about 80 at best. However, in order to achieve the 80 degrees inside, the air coming out of the vent should be 45-55 degrees. The temperature coming directly out of the vent is different than the ambient temperature of the house. The air coming directly from the vent should be 45-55, however this will not be the temperature in your home. If using a thermometer stuck in the vent, and the blower fan on a medium speed, in the full cold position with AC on vent, temperatures should be between 40-50 degrees F.
Best Answer: the book says between 38 and 44 depending on outside temperature and humidity. The coldest that the air conditioning evaporator that the incoming air passes over can get is 33 degrees. That's because if it were 32 degrees the humidity in the air would freeze on the evaporator and cause it to ice over. Then no air could go through the evaporator and the system wouldn't work. As a rule of thumb the temperature of the air rises about 5 degrees as it passes through the ducts to the outlet.