機器
aged
air
air conditioner
apartment
background
blow
building
city
cold
compressor
conditioner
conditioning
control
cool
coolant
cooling
day
dirty
dusty
ecology
electric
electrical
electricity
energy
engineering
environment
equipment
exterior
fan
frame
grunge
hang
heat
house
industry
many
metal
nobody
object
office
old
outdoors
outside
power
retro
rotate
row
rust
rusty
steel
system
technology
texture
turbine
unit
urban
vent
ventilator
vintage
wall
weather
window
wires