Air Con $8,500 for air con is TOO much. Price for Mitsubishi system 2 and 3 should be around $2K+ & $3K+. Total should be around $5K - $6K at most. You can check out the prices at Gain City. There is also one seller in the forum that is selling at quite good price. Painting $1,600 for painting is ok but should document how many times. Usually 3 times - first painting, before carpentry, and final touch up. And usually different kind of paint is needed for ceiling so need to check whether there is additional cost for ceiling paint. And ask for painting to include painting the bathroom pipes just in case you need it. My contractor's quote is inclusive of doors and gates if required at no additional cost.