The comments about the difference between outside and inside temps are irrelevant. There is no quantitative measurement that will tell you what the inside temperature should be based on outside temperature.The 20 degree difference that people like to reference is the temperature difference between the discharge and return air, also referred to as Delta T. An 18-20 degree split indicates the unit is properly charged and properly sized fpr the space you want to cool. A technician can easily determine proper charge by measuring the current draw of the compressor, but that's a topic for another thread. For the purpose of this one, there are some things you can do to improve cooling. First drop the lower cover and make sure the plenum feeding the ducts is properly taped. That is the biggest shortfall with Keystone air conditioner installations. Put your hand up in the return air chamber. You should not feel cold air being sucked in from the evaporator blower. If you do, retape it. Pull the ceiling registers off and make sure the ducts are sealed where the holes were cut for the registers. If they are not properly taped, you are losing cold air into the ceiling where it is doing you no good.
Finally, the more heat you can reject, the less you have to remove. There are many widow treatments such as tint film, foil faced insulation. heat blinds and probably many that I have not heard of. all of these try to stop the heat radiation after it has already entered the camper. IMHO, Thats a little like the cart before the horse. The window tints are only going to reject 65% of the heat.
Solar/heat reflecting screens is a much better way to go. There are two companies, Phifer and E-Z Snap that makes solar screen that I would consider. They claim 95% heat rejection which may seem a little aggressive, but it's still better than 65% and after comparing samples that both companies sent me, I could not tell any difference between Phiffer and EZ Snap, which was twice as expensive. EZ Snap does have a superior mounting system and that's the one I opted for. There are websites that will sell Phifer by the ft and in several widths. . I measured my windows, cut scaled down patterns and arranged them to allow me to order the width I needed to minimize waste.The EZ Snap studs either attach by drilling into the wall of the RV(No Thanks) or they attach with a super-duper 3M adhesive. I haven't installed my screens yet, but that's a project to keep me busy while I'm at Lake Catherine State Park next week.
Hopefully some of this information will help you cool down the trailer and save you some $$$ in the process, and with Fall and cooler weather upon us, you'll have time to do the research and make a sensible purchase.
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2011 Outback 277RL
2013 F250 XLT Crew Cab 6.2L
Bitter Gun Owner
Bitter Clinger
Armed Infidel
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