Appraisal low on refinance, and I would like a reconsideration

[Jeremy Gengenbach]

My house was appraised for a refinance and the appraisal came back at $160,000, which is significantly under what we expected ($190,000). Our house was built in 2011, in a cookie cutter neighborhood and there is an exact replica of our house under contract after 6 days on the market for $182,500. 

I got comps from 2 separate real estate agents a couple of months ago, and both thought our house would appraise for about $185,000. Our mortgage company expected the home to appraise for $190,000... So I can't help but think that the appraiser may have had an off day. What is the best way to approach this to get a second look from the appraiser? Any suggestions would be appreciated!