I've had one running almost nonstop the past seven years. 70-pint. When TT is in storage a low setting takes care of things. When I'm away a few days I run the DH as it is less of a strain on things. Running an A/C on low fan is a problem I'd avoid. A camper burned up here when a neighbor did that. Bad park electric voltage and all. The DH leaves the interior hot, but dry. It's easy for the A/C unit to cool it off from the 90's. And much more comfortable than the clammy air the A/c would struggle to dry.