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Old 01-11-2018, 11:25 PM   #1
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Help from 4002 and 4018 owners

I was getting ready to order my first DP and found out they will not put 3 AC's or 10K generator on a 40'. I do a lot of very hot camping and traveling
and don't want to be uncomfortable. My question is how has only 2 AC's worked for you in hot weather? Any regrets? Thanks in advance for your help.
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Old 01-11-2018, 11:34 PM   #2
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We ordered our 4037 with ( 2 ) 15k units, and 8 kw Generator. On hot ( 90* + days ), the system definitely struggles to maintain its cool - not terrible / just would be nice to be cooler.
The 8 kw Gen has lots of power to run both AC at full capacity. Also if you are plugged in to 50A service you are OK. 30 A hookup will struggle to keep one unit running cool.
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Old 01-12-2018, 07:40 AM   #3
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I would agree britcon, I would think back to back days of 90, plus warm nights may push your comfort level. We tend to stay out of very hot places. Hope that helps.
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Old 01-12-2018, 08:05 AM   #4
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We're in the Southwest - Phoenix, no less. Talk about hot! Our 4018 with the two AC units keeps us comfortable even in the summer time. BUT, we don't like the cold - much prefer warmer climates and don't need to sit inside a 64F RV. We can keep the RV at 75F iniside even during 100F heat. If you need it cooler than that, you might have to step up to the 43xx units with 3 ACs.
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Old 01-12-2018, 08:15 AM   #5
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Our old 40 ft. Tiffin Phaeton had three 15KW air conditioners/heat pumps. In hot climates it would keep up as long as we kept front shades down. Doesn't help your Newmar search.
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Old 01-12-2018, 08:22 AM   #6
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Speaking from personnel experience you can make it with one AC unit working. This past June our front unit died the evening before the start of a 45 day trip out west. We couldn’t get it replaced before or while on the trip. We purchased a pedestal fan to help move the cool air through the coach. We visited South Dakota, Wyoming, Montana, Colorado, Texas and Louisiana. We were never uncomfortable during the entire trip. The bedroom unit held its own and was very comfortable for sleeping. Once we entered Texas we did run the generator and AC while traveling to help maintain the inside temperature as it was 101*. We kept all window shades down and used reflex for additional windshield insulation. Our unit size is 13.5k. I’m not sure why they would not install a third unit or a 10k generator. It appears the AC ducting could support a third unit and looks like plenty of room for a 10k generator. Maybe the roof structor is not designed for a third unit and the added weight of a 10k generator would overload the front axle.
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Old 01-12-2018, 09:35 AM   #7
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Our 2015 Ventana has two 15K Penguin A/C units and an 8K Genset. We also have the Polar Pak R19 insulation in the roof. I think the roof insulation is key to keeping the unit cool with the A/C's in excessive het. We have been in Palm Springs in 110 degree heat and were able to keep the rig at 74 degrees or less for 6 days straight. I have talked to others WITHOUT the R19 insulation and they state that mid 80's is where they are at when the temperature tops 110 degrees. Bear in mind these are fairly extreme and unusual temperatures unless you want to spend your summers in the desert Southwest. Also please note the 15K A/C versus the standard 13.5K A/C units. I hope this helps.
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Old 01-12-2018, 02:36 PM   #8
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I think your opinion on this depends on your comfort level. One says they're fine with two units in Arizona and another says he can get by with one. No offense, but they must think that 80-85 degrees is cool enough.

On one of our first trips we stopped overnight in St George, Utah in the summer. The driving temps that day were 110 degrees through Las Vegas. We ran both A/C's from about noon on, until we arrived at the campground at 6:00 pm where it was 115 degrees. Our A/C units ran all night and didn't get under 80 degrees until about 6:00Am the next day.

On non driving days, in 100 + weather, we have to keep the coach completely shut up, including the shade at the front door, to maintain high 70's. Lastly, we ended up at Lake Shasta in 105 degree weather with only 30 amps last summer. The only way to be semi comfortable was to run one A/C and a box fan at the bedroom door to help circulate air.

If I order another coach, I would definitely order three A/C's if possible. In my particular situation, I would have no need for a larger generator as the three A/C's would only be run when connected to shore power. We would never boondock somewhere that required the generator and three A/C's running. Even if we did, we would just survive on two. It seems that the coach builders find a need to add the bigger generator just because there are three A/C's. Many people boondocking at Nascar races would want the bigger generator, but there should be an option to just order it.

Our friends have a 40' Allegro Bus. It has three A/C's and is always very comfortable inside. There are some things that Tiffin just does better than Newmar and Newmar should pay attention.
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Old 01-12-2018, 07:37 PM   #9
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Thank you all for your help. I was hoping for the same answer from everyone as it would make the choice easy. I canít go bigger my garage is 43í inside and would need smaller trailer. On a different subject l have seen many 4018 days and like them a lot. I have never seen the 4002 but pictures look like the perfect floor plan. The Kitchen slide looks a lot smaller and the two main storage compartments look a lot shorter. Has anyone seen both? I would appreciate your opinion. Thanks
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Old 01-13-2018, 07:01 AM   #10
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We have a 4018.

Downsized from a 42 ft Monaco Camelot. The Monaco had three ACís.

Yep, I was concerned that the DS only had the two. But in the few months we have operated the coach (including August and September in Texas) we have been satisfied with the AC performance, which I attribute mostly to the superior insulation of the DS.

You will note that Newmar does put three ACís as standard on the MADP 4047, so clearly they could offer three units as an option on the 40 foot DS units. I donít understand why they wonít allow a special here unless itís just to encourage the buyers to step up to the MA.
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