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Old 09-20-2016, 12:58 PM   #1
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Improving A/C performance

I've read several different times about making a small shade out of PVC pipe and cloth to place over your A/C unit to improve the performance in hot weather when someone is having trouble keeping cool. So many of these newer RV's including our Cedar Creek have black A/C covers. I was on the roof the other day checking on something and the A/C covers were so hot in the sun I couldn't hold my hand on them. I wonder if we are sacrificing performance for appearance with these black A/C covers? If it helps the A/C units to be in the shade wouldn't the same hold true for using white covers instead of black?
Has anyone else thought of this? Has anyone tried switching their black covers for white to see if it makes a difference in the cooling performance? Thanks Steve
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Old 09-20-2016, 01:10 PM   #2
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I suppose if water isn't an issue the best thing you could do in a hot climate is to rig up a single mister near the inlet condenser air...there would be an art to how much is enough and how much is too much. I would think a single mister with no run off would be great. I may do that sometime. I have 2 a/c units on my soon to be 34ish ft OAL little 5er. I don't think I will have any more trouble. This would add to the life of the a/c. I am also going to insulate the cover. I haven't decided exactly what type of insulation yet. My new ones will be black.


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Old 09-20-2016, 01:40 PM   #3
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If your a/c coil is clean then it won't matter.
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Old 09-20-2016, 02:00 PM   #4
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Most A/C units are designed to run at normal ambient max of 95 deg. or approximately 115 deg inlet air. The problem is the roofs(and covers) can be much hotter than that. Most troubles on this forum are in the extreme conditions. 95+ deg. or extreme load conditions. Kids going in and out, r-2 insulation values, 90+ indoor temps at set-up, low air flow and leaking air flow. One doesn't have to look hard to find heat infiltration and loss in an RV.
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Old 09-20-2016, 02:22 PM   #5
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Yeah I get all the inefficiencies that are inherent in RV's. I just wonder if all the heat that the black covers absorb from the sun are adding to that inefficiency unnecessarily.
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Old 09-20-2016, 02:37 PM   #6
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But of course it does, Steve! Price out replacing all the covers with plain vanilla ones. $
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Old 09-20-2016, 02:41 PM   #7
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Quote:
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But of course it does, Steve! Price out replacing all the covers with plain vanilla ones. $
Or get a can of white spray paint for plastic. There is a thread around where this was advocated...
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Old 09-20-2016, 03:01 PM   #8
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[QUOTE=SailorSam20500;1322307]Or get a can of white spray paint for plastic. There is a thread around where this was advocated...[/QUOTE

I've heard that too, think over that concept for a while. I'll pass on the paint
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Old 09-20-2016, 03:32 PM   #9
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Yeah I'm not fond of painting them either. I quick search shows most replacement A/C covers at around $100. Not a bad investment if it makes enough of a difference. I'd like to find someone who's done it to see it it made a significant difference.
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Old 09-20-2016, 03:52 PM   #10
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Yeah I'm not fond of painting them either. I quick search shows most replacement A/C covers at around $100. Not a bad investment if it makes enough of a difference. I'd like to find someone who's done it to see it it made a significant difference.

That is why I am planning insulation under the cover. The common is the reflectit type. Google search shows very low r rating, but IMO any would help. Maybe reflective first and some foam if heat and space allow. That's my plan anyway.


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