lappir Posted January 28, 2017 Report Share Posted January 28, 2017 I have the Coleman Mach in the "possum belly" of my Spacecraft trailer. It's a little cool in North Florida this morning. I keep my inside temperatures maybe a little lower than most, but have learned I need to have the "Heat Pump" running some to decrease the inside humidity and decrease the condensation I have on some of the metal that extends from the outside of the trailer to the inside. I didn't consider the effects of where the HVAC unit was mounted during the build. I have learned in the past few years that it actually does make a significant difference on where it's mounted and where the supply and return runs are located. My supply to the center ceiling vents in the Spacecraft come up an exterior wall. There is a bit of insulation over the run, but I am not sure just how much. I do know if my trailer is facing North and South and the afternoon sun is striking the same side, my A/C runs a lot more than if I would turn the trailer around. It takes time to push out the hot air and start getting cool air. The reverse is true when it's cooler and may be more noticeable to some. Having the supply along an interior wall would be much better. The return going to the exterior would effect the efficiency much less I believe. The first room for the vent of the supply is in my bathroom. I can close the door and make it really cool or really warm, but it leaves the rest of the trailer with steadily increasing or decreasing temperatures at each end of the trailer. If it's really hot or cold I do close the vents in my garage space and close the door between the garage and living space. If I ever have to replace my HVAC unit I will request that change with the new instillation. These are my personal opinions and I have no science or actual build experience, what I think may work, may not be any better. Consider accordingly. Rod Link to comment Share on other sites More sharing options...
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