The only bird known to make use of infrasound (at about 20 Hz) is the western capercaillie. The hearing range of birds is from below 50 Hz (infrasound) to around 12 kHz, with maximum sensitivity between 1 and 5 kHz. The range of frequencies at which birds call in an environment varies with the quality of habitat and the ambient sounds.
Get started now! 1  Commercial carpet cleaning costs between $.05 and $.20 per square foot. 2  You can rent Rug Doctor carpet cleaning machines for $25 to $40 for 24 hours from many locations. 3  You can buy carpet steam cleaners starting at around $150.
Each carpet cleaning company has an individual furniture moving policy. Most light furniture is removed and replaced at no charge. Furniture cleaning is also available through most carpet cleaners. Sofa cleaning varies from $60-$196 and loveseats are $40-$140. In-house area rug cleaning is charged by the square foot and varies with rug type. Wool costs around $1-$1.50 per sq. ft., or $168-252 for a 12x14 foot rug, while synthetics average .75 cents per sq. ft., or $126 for a 12x14 foot.