Good Sam Club Open Roads Forum: Tech Issues: AC Unit Efficiency
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Greyhound RB

Michigan

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Posted: 05/02/20 08:06pm Link  |  Quote  |  Print  |  Notify Moderator

I have a 32' Keystone 5th wheel. I'm going to replace my only ac unit. Does anybody know if it's possible to compare EER's (Energy Efficiency Ratio) of units somewhere. I run on my generator a lot so the EER is important to me. What amazes me is that window units for homes run around 11-12 EER. I don't think I've seen an rv ac unit hit 10 EER. Considering the price paid for rv units I expect more efficiency. Thank you in advance.

beemerphile1

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Posted: 05/02/20 08:52pm Link  |  Quote  |  Print  |  Notify Moderator

Excellent question, I'm interested also.


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CA Traveler

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Posted: 05/02/20 08:52pm Link  |  Quote  |  Print  |  Notify Moderator

From my home experience efficiency comes at a price. ie Larger and heavier unit. Yes RVs are expensive...


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Posted: 05/02/20 10:35pm Link  |  Quote  |  Print  |  Notify Moderator

I am biased against RV AC's, just plain do not like them. So in my little Toyota I took out the rear window and installed an 8000 btu window AC. Runs nicely on my Honda 2000. Not ascetically pleasing, but I would rather be cool than look cool.

sayoung

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Posted: 05/03/20 06:27am Link  |  Quote  |  Print  |  Notify Moderator

When looking for an AC , divide the BTU's by the Watts . That's EER. No more no less.

cougar28

Lowell,AR USA

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Posted: 05/03/20 07:17am Link  |  Quote  |  Print  |  Notify Moderator

To calculate watts - multiplying the amps by the line voltage.


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wa8yxm

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Posted: 05/03/20 07:56am Link  |  Quote  |  Print  |  Notify Moderator

It is. however short of going to the spec sheet for every maker I do not know.


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dougrainer

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Posted: 05/03/20 10:04am Link  |  Quote  |  Print  |  Notify Moderator

If you are looking to get better cooling in your 32 foot unit with 1 roof AC---Ain't gonna happen. 32 foot RV's need 2 roof AC units to cool correctly. Doug

Gdetrailer

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Posted: 05/03/20 11:06am Link  |  Quote  |  Print  |  Notify Moderator

Efficiency and RVs do not go hand in hand, Anything "RV" is pretty much as inefficient as you can get.

RVs have very little insulation (R3-R4 in walls, R2-3 in floor, R4-5 in roof, most have single pane windows, 1 inch thick doors with R1-2, pretty much 100% of your AC cooling or heating leaks right out of your RV..

AC efficiency is the least of your problems and really just because you may be running it off a generator will amount to a hill of beans no difference in fuel costs between EER of 9-11 ratings.

You do need to look at a couple of differences in construction of window air units and RV roof airs.

Window units can gain some efficiency from splashing the condensate on the outdoor coils, this splash helps reduce the refrigerant temps by the water evaporating off the coils allowing for a smaller outdoor coil and higher efficiency. Window units also are often placed in a window midway between to roof and ground, much cooler place and if you can away from the hotest point of the home.

RV AC units do not use the condensate splash, they are also mounted on top of the roof which is the hottest place on the earth.

If generator and fuel usage is your concern, might as well give up camping in a RV, I have not found any way to save money with a RV, it is a costly hobby.

My suggestion, don't worry so much about the cost of fuel, if you really want to camp, find a shady spot, open the windows and allow the breeze to cool you or just run the AC and gen and stop worrying about every nickle spent, otherwise you will drive yourself crazy trying to milk out every penny you can find.

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MEXICOWANDERER

las peƱas, michoacan, mexico

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Posted: 05/03/20 12:14pm Link  |  Quote  |  Print  |  Notify Moderator

QUICKSILVER

LG WINDOW UNIT (3) 5,000 BTUs

Just kicks the snot out of one 15,000 BTU roof unit.

It froze me out at temperatures close to 100F and high humidity. The amount of condensation was more than double the roof unit. And anywhere in the rig was far cooler than the roof unit.

Learned me about how bad manufacturers lie.

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