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Old 09-04-2007, 05:12 PM   #1
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This past weekend we were out blowing more of our kids inheritance at a local casino. Temps outside were around 105 to 110. Inside ran about 23 to 25 degrees cooler. The issue here is that the front a/c, which I think is a 13.5 BTU, seems a little wimpy for the area it's called on to cool. The rear, same size, does fine and in fact will freeze you out of the bedroom, the front totally inadequate. Has anyone switched to a larger unit?
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Old 09-04-2007, 05:12 PM   #2
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This past weekend we were out blowing more of our kids inheritance at a local casino. Temps outside were around 105 to 110. Inside ran about 23 to 25 degrees cooler. The issue here is that the front a/c, which I think is a 13.5 BTU, seems a little wimpy for the area it's called on to cool. The rear, same size, does fine and in fact will freeze you out of the bedroom, the front totally inadequate. Has anyone switched to a larger unit?
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Old 09-04-2007, 05:29 PM   #3
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We haven't ...but we did talk about it briefly...



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Old 09-05-2007, 04:12 AM   #4
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Being that we have the same PAQ floorplan, with those huge lovely windows, we experience the same heat-issues from time to time as well. Also had a SOB with the atrium plan before this HR, and it had 15k units in it vs the 13.5k's we have now.

I must say it didn't seem to make much difference with the 13.5's or the 15's (unless the other coach had a whole lot less insulation) - when the sun came thru all those front & side windows IT GOT HOT. But having the windows is the trade-off I'll accept.

I'm guessing you do keep the curtains/shades closed during the hot part of the day, so the best solution I've found so far is to get some of the big shiny insulated panels and put 'em up when needed. I covered the edges with the shiny tape so they don't fray or tear as easily. I initially hung them with velcro-tape but the sun eventually melted the glue (duh!), so I punched in some grommets and then attached the panels with cup-hooks mounted right next to the curtain-track. They made a world of difference. I'm not too crazy about how they look, but at least I can cover them with the curtains after they're on. I also made similar panels for the side atrium-windows but have never had the need to use them, since I can always lower the awning for shade. Besides, it gets too dark in there then

All that said and done, if/when the front AC quits I will get a 15k... every little bit does help.

Assuming your AC's are working correctly and there's no vent/duct-blockage, a rule of thumb for AC efficiency is to measure the outlet temp (at a vent) and the inlet temp (right at the intake), the difference should be 15-18*. Outside temp is less of a consideration, to an extent. This is only what I picked up from my research, others who are schooled on AC-work may be able to help with that part more.

HTH,
Ron
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Old 09-05-2007, 07:16 AM   #5
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ronboc, Yeah, front shades all closed and the large atrium windows were under the shade of the awning from 11ish through the afternoon (due to the position of the RV to the sun's rotation through the day).
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Old 09-05-2007, 07:29 AM   #6
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I might also add that the resort (heh heh) only had 30 amps, so that ruled out running both a/c's at the same time. When I did turn the genset on and ran both A/C's, I was able to get the place cooler; that's where the 23 degree difference came from. But you can't always run the genset and not all CG's have 50 amp service, hence my thought on replacing the front A/C with a 15k unit.
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Old 09-05-2007, 03:08 PM   #7
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I'd be very interested to hear how it goes if you do decide to swap units.

Oh my, only 30amps??? And I bet they still have pay-toilets and pay-showers too!

I'm guessing that the combination of 30amps and no reflective screens simply out-powered the one unit. Running the gen-set showed that more cooling power from both units would help, as would anything to reduce the heat-load.

Good luck,
Ron
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Old 09-05-2007, 09:15 PM   #8
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Assuming your AC's are working correctly and there's no vent/duct-blockage, </div></BLOCKQUOTE>

When we bought the coach a couple months ago, Rick checked the AC filter and found insulation scraps and a wad of masking tape in the filter. We have wondered if there are more left-over construction materials (aka garbage) in the vent system.

How do we check? Is it like using a snake in the plumbing pipes? (Rick would probably laugh at my discriptions of this, so be kind.)


Currently living in AZ, we'd like the AC to work as well as it possibly can.
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Old 09-06-2007, 02:31 AM   #9
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My front ac works the same. Never seems to to keep the front of the coach cold enough for me. Had it checked a couple of times and dealer found nothing wrong. I check the temp of air coming out against the temp going in and there was about a 20 degree dif. Back works great. Fact seems to be the ac is not large enough for the sq ft when slides are open and with the amount of windows. I had bought some sun shades for the windshield (inside) they helped but not enough for me so now I have the silver insulation reflecting the sun and heat in the windshield. I also try to park the front to the west when I can.
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Old 09-06-2007, 02:38 AM   #10
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Generally, the front A/C is cooling about 60% of the coach volume when compared to the rear A/C. In addition, the front A/C has to contend with the large heat gain through the windshield and the front windows.

You might try one of the solar blanket type windshield covers to cut you losses here.

Ken
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Old 09-13-2007, 12:47 PM   #11
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Getting back to this topic...

I keep looking at that big square hole in the roof right over the galley and think: "Wouldn't another A/C unit look nice up there right about now?"

I don't know if there's any 110vac plumbed up there (kinda doubt it) but it would be a nice cool-weather project to snake another line if needed. The ducting is already in-place next to it (I checked) so it would be a relatively-simple matter to get a 3rd A/C installed (Everybody go: "AHHHHHHH! Coool air!") for next summer.

Certainly it would take some judicious energy-management to make sure nothing gets overloaded (genset or 50-amp line) if all 3 units are on-line at the same time to keep from wiping out the neighborhood. But it all might be worth it....
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Old 09-13-2007, 01:45 PM   #12
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Our new coach (2008 Diplomat 40') has a 15K in the front and a 13.5 in the rear. It is amazing the difference from my 2006 37' that had 2 13.5 units. It would definetely be worth it to upgrade to a 15K IMHO. It really cools nicely in mid 90's heat with very high humidity.
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Old 09-13-2007, 02:36 PM   #13
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My back A/C went out a month ago and I have it in the shop right now. Instead of just replacing it (under warantee), I opted to pay $600.00 to have the front A/C moved to the back, and a 15K unit put in the front. This should help a little! On my former Winnebago, they had a pair of 15K units that kept it nice and cold. I guess Monaco puts in 13.5 units to "keep the price down".

Let's see, bigger coach, smaller A/C units...... this does not compute!
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Old 09-13-2007, 03:58 PM   #14
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Our Time:
Our new coach (2008 Diplomat 40') has a 15K in the front and a 13.5 in the rear. It is amazing the difference from my 2006 37' that had 2 13.5 units. It would definitely be worth it to upgrade to a 15K IMHO. It really cools nicely in mid 90's heat with very high humidity. </div></BLOCKQUOTE>That's really interesting. I'm dropping mine off this weekend to have a few things looked at, I figure I'll get an estimate then.
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