Quote:
Originally Posted by JABURKHOLDER
How about when you first set up at your site in hot weather ?
I open the vents, turn on the a/c and push out the hot air. As it cools down inside, I close the vents and keep them closed the rest of the time at that site. Been dealing with triple digit temps the last few weeks and so far so good.
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Only if you are in a situation where it's hotter inside than out. If the A/C units produced a
positive pressure inside your trailer as they cooled, that would work. But, they don't. That is exactly how you use an evaporative A/C and it works (In fact you absolutely have to open windows with those because they
do produce such a strong positive pressure), but it won't help a refrigeration unit. Actually,
it hurts efficiency, just like in a stick home. Refrigeration type air conditioners don't pull air from the outside, then cool it, then push it into your trailer. They
do not create a positive pressure on the inside like an evaporative air conditioner does. They simply pull the heat out of the air already inside the trailer, and vent that heat to the outside via the coils. Just like your automobile A/C, they recirculate the inside air, cooling it better than when that air mixes with any outside air.
Obviously, if the air temperature inside the trailer is hotter than outside air temperature, then opening the roof vents will allow that warmer inside air to escape, thereby pulling the cooler outside air in to replace it as it rises up and out. But, that simply can't happen if it's hotter on the outside. Not even with the A/C running. In that case (hotter outside than inside), close everything, block any solar heating you can, and turn on both A/C units and wait for the heat to get pulled out of the inside air.
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