This equates to nearly 900 hours of instruction per year, which is similar to or less than many U.S. states, including Florida, New York, Texas, and Massachusetts. At the middle school level (grades 6-8), Chinese students attend just under 1,000 hours of school per year, a figure similar to that of most U.S. states.
1 Hiring a professional pressure-washer costs about $0.08-$0.35 per square foot (depending on local rates), but can go as high as $0.40-$0.80 a square foot depending on the amount and type of stains, dirt, mold or other problems. Buying a basic residential pressure washer with an electric motor starts around $70-$200, depending on size and capacity. 2  A gas-powered residential model usually has a higher pressure rating than an electric machine, and is about $300-$1,000.
House pressure washing that cleans away dirts, molds, mildews and algae is usually done with low pressure system and mix of cleaning liquids. The types of equipment, mix of cleaning liquids, and experience can make a big difference on quality of the cleaning, time it takes, and the cost of of the job. In 2017, the national average cost to pressure wash a house was $282 according to Home Advisor. Typical Range â $184 to $380. Harte Powerwashing Special Price â $99 â up to 1250 sq ft home.