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12-02-2020, 07:49 PM
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#1
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Junior Member
Join Date: Sep 2020
Posts: 3
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Is one A/C enough in a 27L-5?
We ordered a new 27L-5, expecting delivery by April. We have no experience in hot climates and are wondering if one A/C unit is enough if we get to someplace like Arizona.
We are considering upgrading to both a 50 AMP service and a 5.5 ONAN, to provide capability for adding a second A/C later if needed.
However, based on the experience of others, perhaps that is overkill for this size 5th wheel.
What do 'we the people' recommend? Is one A/C enough in a 27L-5?
Thank you for reading and your input!
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12-02-2020, 07:59 PM
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#2
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Senior Member
Join Date: Jul 2018
Posts: 2,719
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Don't know the quality of the insulation on your unit, but my 15000 btu ac on my 25 footer will not cut it when temps get close to 100 f.
__________________
Foretravel tag axle 40 ft. 500 hp/1550 ft/lbs ism 1455 watts on the roof. 600 a/h's lithium down below.
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12-03-2020, 05:17 AM
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#3
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Senior Member
Join Date: Apr 2017
Posts: 180
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Part of the reason we went 50A was so the second AC would be pre wired.
50A gives you much more power and you can run just about everything at once. ( 50A service is 240V or as a fox would use it 2 120V 50A )
30A is 1/3 the AMP that a 50A is
Depends on when you are in AZ, You and how much shade.
I would say mid 90s and we are "good" any more and I would be moving the dealer installed solar around to add the second AC
Go 50A they make adapters so you can plug into 30A if 50A is not available.
Oh and go with a surge protector
We went with https://hughesautoformers.com/product/pwd50-epo-h/
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12-03-2020, 07:38 AM
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#4
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Senior Member
Join Date: Apr 2014
Location: Montana, Arizona
Posts: 544
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I'd go with the 50 amp option with the prewire for sure. We can be pretty comfortable into the low 90s but we have to work at it at that temp. There is a lot of good info on improving the A/C on the NROA site. Unfortunately (for your pocketbook) there are also a lot of good mods for the 27-5. Extra lights, additional windows, fireplaces and the like. There is also a lot of good info on what options to look for with a factory order.
I'd leave out the Onan. You will need the storage room on a 27-5 and even with the large propane tanks, you won't be able to do any extended boondocking with the genny running. I'd consider putting a gas unit in the truck bed or a rear mount carrier for one. I've gone both ways and they both work.
__________________
2016 Arctic Fox 27-5L
2018 GMC 3500 Duramax
2018 JLUR
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12-03-2020, 07:41 AM
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#5
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Senior Member
Join Date: Mar 2017
Posts: 598
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You need two AC's on any Rv if you plan on being anywhere in the Southern part of the USA.
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12-03-2020, 08:13 AM
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#6
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Senior Member
Holiday Rambler Owners Club
Join Date: Jun 2011
Posts: 8,413
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If you are going to kick in for 50 amp upgrade, add the 2nd AC and you will not regret it for sure. That is a lot of cubic feet to cool.
We had one AC in our last 30 ft A with one slide and we always wished we had two.
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Myron & Deborah
08 HR Endeavor 40 SKQ
2016 Ford F150 Limited V6 with Ready Brake
Aluminator tow bar, Demco base plate
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12-03-2020, 08:40 AM
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#7
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Senior Member
Join Date: Dec 2011
Location: Houston TX.
Posts: 808
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In the south in summer no way one unit is enough. In going to our class c having a second unit was a requirement not a maybe add. This requirement eliminated a lot of units we looked at. The 50 amp upgrade is a nice thing to have with 2 ACs. Safe travels
Enjoy the journey
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Part timers 2020 Entegra Esteem 29V class c. Tow 2017 Jeep Rubicon. Full timed in 2008 Newmar Essex
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12-03-2020, 08:53 AM
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#8
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Senior Member
Winnebago Owners Club Workhorse Chassis Owner
Join Date: Nov 2018
Posts: 895
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Quote:
Originally Posted by seabeckian
wondering if one A/C unit is enough if we get to someplace like Arizona.
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"Enough" has a number. What degree of cooling do you want?
A single A/C on my 30 footer nets about a 20 degree delta inside/outside. If it's 95 out, it's 75 inside. But around here it can hit 105 during the day and you can feel the heat coming through the sun-facing walls. Underway the dash A/C makes some contribution, so between the two I find it's "enough" for me. Arizona in summer is a whole 'nother ball game, you have night time heat to deal with.
Mark B.
Albuquerque, NM
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12-03-2020, 09:31 AM
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#9
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Senior Member
Vintage RV Owners Club Texas Boomers Club Oklahoma Boomers Club Ford Super Duty Owner
Join Date: Aug 2000
Location: Full Time, TX Home Base
Posts: 19,064
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Mark K5LXP, the method of measure is not the 20 degF between inside and outside temperature. The heat load depends on amount of sun, the direction the RV is pointed and other factors. The 20 degF measure is the difference across the unit. The outlet air should be 18 to 20 degF colder than the inlet air to the unit.
To the OP, go ahead and get the second A/C on the unit. Once you get close to 90 degF ambient (outside temperature), the second unit will be great.
Ken
__________________
Amateur Radio Operator (KE5DFR)|Full-Time! - 2012 6.7L Ford Crew Cab Dually -2013 HitchHiker Champagne 38RLRSB - Travel with one Standard Schnauzer and one small Timneh African Gray Parrot
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12-03-2020, 09:42 AM
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#10
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Junior Member
Join Date: Sep 2020
Posts: 24
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Quote:
Originally Posted by W5CI
You need two AC's on any Rv if you plan on being anywhere in the Southern part of the USA.
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2nd AC unit is a must down this way during the warmer months.
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12-03-2020, 03:26 PM
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#11
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Junior Member
Join Date: Sep 2020
Posts: 3
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Great Answers!
I appreciate everyone's experience! Thank you for all the input.
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12-03-2020, 05:02 PM
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#12
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Senior Member
Outdoors RV Owners Club
Join Date: Nov 2014
Location: Northern Ca
Posts: 398
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Quote:
Originally Posted by W5CI
You need two AC's on any Rv if you plan on being anywhere in the Southern part of the USA.
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__________________
2017 Chevy 3500 DRW D/A LTZ 4X4, 50 gal Transflow Aux Tank, Trailersaver BD5
2020 Arctic Fox 32-5m
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01-15-2021, 01:06 PM
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#13
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Junior Member
Join Date: Nov 2020
Posts: 5
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Two AC units are nice but not having a electric roof fan in the bedroom is something I can not live without. We camp from Alaska thru Texas and yes there have been times I wish I had the second AC unit, but to sacrifice the roof fan and to say the least give up the front storage for the Onan is not worth it to me. Having an RV requires sacrifices and which ones you can live with and which ones you can not.
Kirk
27-5
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