A cold air intake would take in all surrounding air and it would increase your horsepower a certain amount. The warm air it takes in would not affect it much.
The 2013 Honda Accord's engine produces 185 hp @ 6400 rpm.
The 2012 Honda Accord's engine produces 177 hp @ 6500 rpm.
The 2006 Honda Accord's engine produces 166 hp @ 5800 rpm.
The 2003 Honda Accord's engine produces 160 hp @ 5500 rpm.
The 2011 Honda Accord's engine produces 177 hp @ 6500 rpm.
The 2004 Honda Accord's engine produces 160 hp @ 5500 rpm.
The 2005 Honda Accord's engine produces 160 hp @ 5500 rpm.
The 2014 Honda Accord's engine produces 185 hp @ 6400 rpm.
The 2010 Honda Accord's engine produces 177 hp @ 6500 rpm.
The 2007 Honda Accord's engine produces 166 hp @ 5800 rpm.
The 2001 Honda Accord's engine produces 135 hp @ 5400 rpm.
The 2002 Honda Accord's engine produces 135 hp @ 5400 rpm.