Originally Posted by Triguy
Condensation is common, but easily controlled. Depending on the number of people sleeping in the trailer, I find the following work well (in order):
-Vent cover open (Maxxair covers on vents for when it rains.)
-Unzip each bunk window at bit.
-PUGs (pop up gizmos), which are covers for each bunk.
-Run bathroom fan, creating a cross breeze.
We have five people and two dogs at night in our hybrid and that is a lot of moisture getting exhaled. It needs somewhere to go so anything that creates a cross breeze helps.
I am in the process of developing a cheap RV HRV (Heat Recovery Ventilator) made out of some 1/4in Coroplast, a glue gun and a couple of computer fans. Should be less than $50 to make including a couple of helpful tools. Here is a pic of the first prototype. It will be designed to stick into a window and plugged into a 12 receptacle. The computer fans draw VERY little power on the order of a tenth of an amp.
The concept uses a cross flow core that allows the incoming dry fresh air to exchange heat with outgoing stale humid air and so reduces the heat loss. The prototypes seem to be about 75% efficient and allow a controlled inflow of air.
I will make a video of the construction as soon as I get all the kinks worked out, and post them on facebook and put a link here. May not get to it until later in the summer or fall, as it's primary use would be when it get cooler..
If anyone is interested in trying one out and reporting back on how they appear to work, I may make up a couple of them for evaluation. PM me if you are interested.