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Old 06-26-2016, 09:26 AM   #21
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What are you trying to achieve with this modification?


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Old 06-28-2016, 07:55 PM   #22
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Wow I've got to try this my 1ac Mach 3 on my 831ress struggling to keep kool, in fact at the beach in the heat of the day it doesn't
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Old 06-30-2016, 08:55 AM   #23
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Originally Posted by mstell2 View Post
What are you trying to achieve with this modification?


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Old 06-30-2016, 06:16 PM   #24
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Originally Posted by mstell2 View Post
What are you trying to achieve with this modification?


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Sorry I have been a bit busy and have not had time to answer.

Someone on the forum a while ago was up on the roof of his RV working on the air conditioner and noticed the air handler was ice cold. He thought that meant he was losing cold air through the cracks and crevasses of the loosely screwed together air handler. His solution was to metal tape all the corners to seal the unit air handler and then he glued Mylar insulation to all the flat surfaces to keep the cold air in and the hot air out. I agree and his (and my) mod allowed my unit to function flawlessly in the Texas 115 plus heat.


As to insulating the large compressor pipe:

"The large, cold, low pressure line, carrying the evaporated refrigerant from the air handler, should be insulated to prevent condensation. The small, warm, high pressure line, carrying condensed refrigerant into the air handler, should not be insulated. I am not an air conditioning professional so your mileage may vary.

Explanation: The unit outside the house compresses the refrigerant from the large line. This makes the refrigerant very hot. Then the refrigerant is run through the condenser coils and the fan blows outside air over them to remove the heat and condense the refrigerant back to liquid. The small line now carries the warm liquid refrigerant back into the house. No insulation is needed on this line because it is still warmer than the outside air. If the air cools it some more, that only helps. In the house, the pressurized liquid refrigerant is allowed to rapidly decompress in the evaporator coil. The instant drop in pressure causes an instant drop in temperature, making the evaporator coil very cold. Interior air is blown over this coil, cooling the air and warming the coil and refrigerant. The evaporated refrigerant, which is still rather cold, now flows out of the house in the large pipe. It does not help us for this refrigerant to get warmer after it leaves the evaporator coils. It just makes it harder to compress and cool in the condenser coils. So we want to prevent condensation on this pipe. That is the reason for the insulation. "
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Old 07-05-2016, 07:45 PM   #25
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Last week managed to do this mod on our Coleman Mach AC 15k. This week we're in Kansas and outside temps are in 90's and expected to see 100s. The mod has improved the performance of the unit. Thanks Herk7769 on
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Old 07-06-2016, 12:18 PM   #26
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Also did this mod after reading this an was very pleased with the out come camping in Fla last wkend, I have a tan roof an now debating coating it white , Trying everything before installing a second Ac .
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Old 07-10-2016, 11:29 AM   #27
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Did this morning... finished and it was 82 inside. Cranked her up and two hours later dropped 7 degrees to 75.

Never could get below 80 in full sun before.
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Old 07-10-2016, 03:03 PM   #28
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Our Dometic AC units have black cowlings. Would painting them white really make that much of a difference?
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Old 07-10-2016, 04:37 PM   #29
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Our Dometic AC units have black cowlings. Would painting them white really make that much of a difference?
IMO, no. Keeping the cold air INSIDE the camper is more important as it has a greater effect on cooling the inside. Making the ROOF white reflects heat that would have been absorbed by the camper back into the atmosphere. The cowling's impact on the heat inside the air conditioner (exclusive of the air handler) should be minimal. The giant fan blowing across the compressor coils is using ambient air at outside air temp anyway.
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Old 07-12-2016, 09:29 AM   #30
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Herk, do you happen to remember what size the refrigerant line is that needs to be insulated? Great looking mod and I have plenty of reflectix left over for evaporator box - may as well do it all at once.
Thanks!
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