The PKFY wall-mounted indoor unit is very quiet with sound ratings as low as 32 dB(A). The seven sizes available for the PKFY models are 6,000, 8,000, 12,000, 15,000, 18,000, 24,000 and 30,000 Btu/h. This style of indoor unit is well-suited for hotels, assisted living facilities, offices, residences and other applications where wall space is available.