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.
Professional Carpet Cleaning Cost. Most homes have an average of between 800 and 1000 square feet of carpet and the cost of carpet cleaning per square foot can range from $0.30 to $0.40.This means that the carpet cleaning cost for the average home will be close to $350.ith this price, that would equate to $70 per year if you had your carpet cleaned once every 5 years. If your home is larger with more square feet of carpet, than the price of carpet cleaning will be higher but some companies may provide discounts for larger jobs.