What is the utility of south-facing windows in northern climates?
A) It keeps the house cool in the summer.
B) The north side of the house faces the sun.
C) Wind currents won't blow directly into the house.
D) It allows the sun's rays to pass into the house.
Question 2
How does a nonsolar pool cover increase the efficiency of a nonsolar pool heater?
A) It absorbs more heat from the sun.
B) It reduces the amount of evaporation.
C) It keeps the heater cool.
D) It does not allow chlorine to escape.