Which of the following instruments helps to maintain the correct humidity and temperature of a building?

Which of the following instruments helps to maintain the correct humidity and temperature of a building?
A. A compressor
B. A refrigerator
C. Air blower
D. Air conditioner

Correct Option: Answer is D
Compressor is an instrument to supply air or other gas at increased pressure
Refrigerator is an appliance to keep things cold
Air blower is used to release air
Air conditioner is used to remove heat and maintain a stable temperature in an occupied space

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