it's the old principle: a heat pump moves energy from unwanted to

iron window wall wood black white furniture symmetry door monochrome line facade architecture design glass lighting air condition conditioning apartment box building business cage city connection cooler cooling energy exchange factory fan fence garage glycol heat pump heating house industrial installation instruction locked mall management medium mesh net office plumbing propeller protection room serial setting shopping supply system thermometer tower urban warehouse wire yard it#39aph39#s old principle: moves unwanted