At the outset let me disclose. I used 5 vendors from Angie's list..4 of them I rated A, except this one. One word...they are not ethical and professional. I have filed a complaint with BBB, but wanted to alert all future customers as well Here are the details.... This service provider provided me a quote to install an exhaust fan on a wall, for $540, which I had accepted. Total work performed exceed $1500. Once their technician arrived, he determined that he could not mount the exhaust on the wall, rather ceiling is a better option. My mistake, I presumed it would cost the same, as it was never mentioned otherwise. Once he installed the fan on the ceiling, he determined that he didn't have the right equipment to mount the exhaust on the roof , hence left the vent open in the attic. Today I receive a quote (after 20 days of previous installation) that it will cost $335 more to complete the job. This is on top of $540, which was charged to me for incomplete job. This is ridiculous as no one ever told me that this would cost more than $875 to install a $100 fan. The provider contends that the scope of work was different. My problem, why I was I not told the same and provided a fresh quote?. Why did they do half the work, when they did not have any approved quote from me? Isn't this a code violation that they left a vent open in my attic, and now I am supposed to find some else to complete their job...Highly unprofessional and unethical behavior to extract more money from your customer.. Caveat to fellow members...BEWARE, and get it in writing, else....