What mechanical device is used to condition supply air (coming into the building) with return air (exiting the building)

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What mechanical device is used to condition supply air (cominginto the building) with return air (exiting the building)?
Select one:
a. Chiller
b. Ventilation Fan
c. Heat Exchanger
d. Cooling Tower
What is not true about an ASHRAE level 1 energy audit?
Select one:
a. It includes energy benchmarking
b. It is unlikely to include cost and benefit calculations
c. It is considered "brief"
d. It has roughly a 10% (+/-) margin of error
__________ is the process through which we are able to comparebuildings in different climate zones as well as adjust for abuilding's performance over abnormally hot or cold years.
Select one:
a. Normalization
b.Standardization
c.Graphical Optimization
d. Globalization
The common energy unity is
Select one:
a.therm
b.CCF
c.kWh
d.Btu