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.
With the flat rate pricing on average during a solid day of work, with 3 three room homes, would make you the carpet cleaning business owner a take home of $255 dollars for a day that started at 9am and end around 2pm give or take an hour averaging about $50 dollars an hour, and the average is nearly $75 an hour.ere is a simple review of how much you could possibly make cleaning carpets. Most carpet cleaning business owners know that there are only two methods of bidding, footage and flat rate.