2006 Honda Civic won't warm up

We have a 1998 Saturn SL and the Civic. I started both cars this morning while I shoveled snow. When I was done shoveling, the Saturn was fully defrosted and warm inside while the Civic was still blowing luke warm air and hadn't even begun defrosting. It has been doing this for a while. It eventually will warm up fully but takes far longer than other cars. The engine shows normal temp but it is still blowing cool air. Recently complained to the Honda dealership and they couldn't find anything wrong.