Driving with air conditioner

For 2-3 years our dash air didn't work so all we had was the house air. However, we couldn't get the vents aimed so that the air actually blew onto us as we drove. We got the dash air fixed and really prefer that because it keeps us cool where we are sitting while driving. Ocasionally we have run both at the same time, but if we do that we need to put the dash air on "recirculate" so we don't bring in the fumes from the generator. Just like most systems in the coach, its nice to have different options for different circumstances.