Furnace blows cold air then barely warm

[Argyle1968]

Is it common for furnace to blow just lukewarm air? The fan comes on (thermostat is working) I hear the pilot light and burner come on, the air warms a little. It doesnt feel very warm. The overnight temps are in the 40's, not too cold, but we are going out one more time next month, and I want to make sure when it is really comd, we are able to stay warm and have a good time. This is our first travel trailer. A 2018 Jayco Jayflight 174bh 21.5 foot

[DavidJay]

Yes, all "Atwood" or similar RV furnaces turn on the blower first (blowing cold air) before turning on the burner. This is a safety measure, it purges the system to prevent explosion (in case there were a propane leak into the blower housing).

At the end of each cycle, the burner turns off and the fan keeps running for a minute or two to move as much heat as possible out of the burner and into the living area.

[cekkk]

Warm is subjective. Does your camper attain the temperature you select in a reasonable time?