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cabin of the 2026 newmar mountain Aire
2026 2025 2023

2026 Newmar Mountain Aire: small footprint with a big presence

Some RVs just check the boxes. The 2026 Newmar Mountain Aire does just that, rewriting the list and setting a new standard on the highway..

  • Shop 2026 Newmar Mountain Aire RVs
  • Shop All Years
  • Overview
  • Floor Plans
  • Inventory
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  • About

About the 2026 Newmar Mountain Aire

The 2026 Mountain Aire packs big-time power, earns all the style points, and delivers on its high-end comfort in a coach that’s just under 39 feet long. It’s the shortest tag-axle in Newmar’s lineup, built on the SpartanⓇ K3 chassis with a 525-horsepower CumminsⓇ engine and 15,000-pound towing capacity. Headed cross-country or out for the weekend? No worries, this RV gives you the control, performance, and space to make every mile feel like home.

Inside and out, the Mountain Aire knows how to make an entrance. From premium finishes to smart tech, it provides everything travelers look for in a high-end motorhome. You can find the 2026 Mountain Aire now at Transwest RV in Colorado, where you can see it for yourself.

2026 Newmar Mountain Aire

2026 Newmar Mountain Aire Floor plans

2026 Newmar Mountain Aire 3825 Floor Plan

Watch Walkthrough

2026 Newmar Mountain Aire 3825

Sleeps 4

Sleeps 4

3 Slideouts

3 Slideouts

2026 Newmar Mountain Aire 4118 Floor Plan

Watch Walkthrough

2026 Newmar Mountain Aire 4118

2026 Newmar Mountain Aire 4551 Floor Plan

Watch Walkthrough

2026 Newmar Mountain Aire 4551

Sleeps 3

Sleeps 3

3 Slideouts

3 Slideouts

2026 Newmar Mountain Aire 3823 Floor Plan

2026 Newmar Mountain Aire 3823

2026 Newmar Mountain Aire 3825

Shop All Newmar Mountain Aire RVs

Disclaimer: This floor plan is for general reference. Actual features and styling could differ.

2026 Newmar Mountain Aire 3825

About the Newmar Mountain Aire 3825

  • Sleeps 4
  • 38ft Long
  • 3 Slide Outs
Specifications
Type
Class A
Year
2026
Make
Newmar
Model
Mountain Aire
Submodel
3825
Amenities
Living Room Amenities
  • TV
Kitchen Appliances
  • Induction cooktop
  • Convection Microwave
  • Stainless Steel Sink
Outdoor Kitchen Appliances
  • Exterior Freezer
Living Area Seating Options
  • Sofa Sleeper
Bedroom Amenities
  • Wardrobe
  • Dresser
  • TV
Additional Beds
  • Sofa Sleeper
Bathroom Amenities
  • Medicine Cabinet
  • Vanity
  • Single Sink
  • Shower
  • Shower Seat
Cab Amenities
  • Comfort Drive Steering
  • Cruise Control
  • Digital Dash
  • Heated Driver Seat
  • Heated Passenger Seat
  • Leather Seats
  • Mobileye® Lane Tracking and Departure System
  • OnGuard™ Collision Mitigation Adaptive Cruise System
  • Push Button Start
  • Satellite Radio
  • Wireless Charging Mats
  • Radio
General Amenities
  • Washer/Dryer Stackable
  • Outside Entertainment
  • Dual Pane Windows
  • Engine Block Heater
  • Starlink Internet System
Exterior
Number of Slide Outs
3
Number of Awnings
1
Number of Emergency Exits
0
Interior
Sleeping Capacity
4
Master Bedroom Bed Size
King
Master Bedroom Bed Type
Standard
Bunk Bed
No
Master Bedroom Flooring
Tile
Number of Bathrooms
1 1/2
Bath Flooring
Tile
Dining Table
Euro Booth Dinette
Living Room Flooring
Tile
Kitchen Flooring
Tile
Kitchen Refrigerator Type
Residential Refrigerator
Kitchen Refrigerator Size(ft)
19.7
Systems
All Electric
No
Battery Type
Lithium
Battery Size
640
Shore Power Size
50 Amp
Inverter
1
Solar
No
Generator
1
Water Heater Type
Hydronic
Number of ACs
2
AC Rating (BTU)
15,000
Heating System
Hydronic
Heated Tanks
No
All Weather Package
No
Total Propane Capacity (gal)
0
Black Water Capacity (gal)
60
Fresh Water Capacity (gal)
105
Gray Water Capacity (gal)
80
Dimensions & Weights
Height
13.17
Width
8.46
UVW (lbs)
41,000
Payload Capacity (lbs)
13,000
Tongue Weight (lbs)
1,500
Hitch Capacity (lbs)
15,000
Engine & Chassis
Jack Type
Hydraulic

Disclaimer: Not every vehicle includes every feature or option listed. Please verify all features and options with your salesperson before purchase.


Video Walkthrough

Disclaimer: This video is for general reference. Actual features and styling could differ.

Preview image of the linked video

Browse Available Inventory

Shop All Newmar Mountain Aire RVs
  • Transwest | Image Coming Soon

    Coming Soon

    2026 Newmar Mountain Aire 3825

    New Class A at Transwest of Frederick, CO

    • An icon of a bed

      Sleeps 4

    • An arrow pointing outward from the center of a vertical rectangle

      3 Slide Outs

    • See Details
Shop All Newmar Mountain Aire RVs

Explore other floor plans

2026 Newmar Mountain Aire 4118 Floor Plan

Watch Walkthrough

2026 Newmar Mountain Aire 4118

2026 Newmar Mountain Aire 4551 Floor Plan

Watch Walkthrough

2026 Newmar Mountain Aire 4551

Sleeps 3

Sleeps 3

3 Slideouts

3 Slideouts

2026 Newmar Mountain Aire 3823 Floor Plan

2026 Newmar Mountain Aire 3823

Shop All Newmar Mountain Aire RVs

2026 Newmar Mountain Aire 4118

Shop All Newmar Mountain Aire RVs

Disclaimer: This floor plan is for general reference. Actual features and styling could differ.

2026 Newmar Mountain Aire 4118

About the Newmar Mountain Aire 4118

Specifications
Type
Class A
Year
2026
Make
Newmar
Model
Mountain Aire
Submodel
4118
Interior
Bunk Bed
No
Systems
All Electric
No
Inverter
No
Solar
No
Generator
No
Heated Tanks
No
All Weather Package
No

Disclaimer: Not every vehicle includes every feature or option listed. Please verify all features and options with your salesperson before purchase.


Video Walkthrough

Disclaimer: This video is for general reference. Actual features and styling could differ.

Preview image of the linked video

Browse Available Inventory

Shop All Newmar Mountain Aire RVs
  • 2026 Newmar Mountain Aire 4118

    6

    2026 Newmar Mountain Aire 4118

    New Class A at Transwest of Belton, MO

    • An icon of a bed

      Sleeps 3

    • An icon of a fuel container

      Diesel

    • An arrow pointing outward from the center of a vertical rectangle

      3 Slide Outs

    • A minimal icon representing a speedometer

      665 Miles

    $942,350 msrp
    • See Details
  • 2026 Newmar Mountain Aire 4118

    Sold

    31

    2026 Newmar Mountain Aire 4118

    New Class A at Transwest of Frederick, CO

    Sold
    • See Details
  • Transwest | Image Coming Soon

    Coming Soon

    2026 Newmar Mountain Aire 4118

    New Class A at Transwest of Frederick, CO

    • See Details
Shop All Newmar Mountain Aire RVs

Explore other floor plans

2026 Newmar Mountain Aire 3825 Floor Plan

Watch Walkthrough

2026 Newmar Mountain Aire 3825

Sleeps 4

Sleeps 4

3 Slideouts

3 Slideouts

2026 Newmar Mountain Aire 4551 Floor Plan

Watch Walkthrough

2026 Newmar Mountain Aire 4551

Sleeps 3

Sleeps 3

3 Slideouts

3 Slideouts

2026 Newmar Mountain Aire 3823 Floor Plan

2026 Newmar Mountain Aire 3823

Shop All Newmar Mountain Aire RVs

2026 Newmar Mountain Aire 4551

Shop All Newmar Mountain Aire RVs

Disclaimer: This floor plan is for general reference. Actual features and styling could differ.

2026 Newmar Mountain Aire 4551

About the Newmar Mountain Aire 4551

  • Sleeps 3
  • 44ft Long
  • 3 Slide Outs
Specifications
Type
Class A
Year
2026
Make
Newmar
Model
Mountain Aire
Submodel
4551
Amenities
Living Room Amenities
  • TV
  • Televator
Kitchen Appliances
  • Convection Microwave
  • Induction cooktop
Outdoor Kitchen Appliances
  • Exterior Freezer
Living Area Seating Options
  • Jacknife Couch / Bed
  • Sofa Sleeper
Bedroom Amenities
  • Wardrobe
  • Dresser
  • Safe
  • TV
Additional Beds
  • Jacknife Couch / Bed
  • Sofa Sleeper
Bathroom Amenities
  • Double Sink
  • Shower
  • Shower Seat
Cab Amenities
  • Heated Driver Seat
  • Heated Passenger Seat
  • Comfort Drive Steering
  • Lane Keeping Assist
  • OnGuard™ Collision Mitigation Adaptive Cruise System
  • Xite Dash Radio with Apple CarPlay® with 9" Monitor with Nav-N-Go Navigation System
General Amenities
  • Washer/Dryer Stackable
Exterior
Number of Slide Outs
3
Number of Awnings
2
Number of Emergency Exits
1
Interior
Sleeping Capacity
3
Master Bedroom Bed Size
King
Master Bedroom Bed Type
Standard
Bunk Bed
No
Master Bedroom Flooring
Tile
Number of Bathrooms
1 1/2
Bath Flooring
Tile
Dining Table
Euro Booth Dinette
Living Room Flooring
Tile
Kitchen Flooring
Tile
Kitchen Refrigerator Type
Residential Refrigerator
Kitchen Refrigerator Size(ft)
19.7
Systems
All Electric
No
Battery Type
Flooded Lead Acid
Battery Size
220
Shore Power Size
50 Amp
Inverter
1
Solar
No
Generator
1
Water Heater Type
Hydronic
Hot Water Capacity (gal)
0
Number of ACs
3
AC Rating (BTU)
15,000
Heating System
Hydronic
Heated Tanks
No
All Weather Package
No
Total Propane Capacity (gal)
22
Black Water Capacity (gal)
60
Fresh Water Capacity (gal)
105
Gray Water Capacity (gal)
80
Dimensions & Weights
Height
13.17
Width
8.5
UVW (lbs)
44,200
Payload Capacity (lbs)
9,800
Tongue Weight (lbs)
15,000
Hitch Capacity (lbs)
15,000
Engine & Chassis
Jack Type
Hydraulic

Disclaimer: Not every vehicle includes every feature or option listed. Please verify all features and options with your salesperson before purchase.


Video Walkthrough

Disclaimer: This video is for general reference. Actual features and styling could differ.

Preview image of the linked video

Explore other floor plans

2026 Newmar Mountain Aire 3825 Floor Plan

Watch Walkthrough

2026 Newmar Mountain Aire 3825

Sleeps 4

Sleeps 4

3 Slideouts

3 Slideouts

2026 Newmar Mountain Aire 4118 Floor Plan

Watch Walkthrough

2026 Newmar Mountain Aire 4118

2026 Newmar Mountain Aire 3823 Floor Plan

2026 Newmar Mountain Aire 3823

Shop All Newmar Mountain Aire RVs

2026 Newmar Mountain Aire 3823

Shop All Newmar Mountain Aire RVs

Disclaimer: This floor plan is for general reference. Actual features and styling could differ.

2026 Newmar Mountain Aire 3823

About the Newmar Mountain Aire 3823

Specifications
Type
Class A
Year
2026
Make
Newmar
Model
Mountain Aire
Submodel
3823
Interior
Bunk Bed
No
Systems
All Electric
No
Inverter
No
Solar
No
Generator
No
Heated Tanks
No
All Weather Package
No

Disclaimer: Not every vehicle includes every feature or option listed. Please verify all features and options with your salesperson before purchase.

Explore other floor plans

2026 Newmar Mountain Aire 3825 Floor Plan

Watch Walkthrough

2026 Newmar Mountain Aire 3825

Sleeps 4

Sleeps 4

3 Slideouts

3 Slideouts

2026 Newmar Mountain Aire 4118 Floor Plan

Watch Walkthrough

2026 Newmar Mountain Aire 4118

2026 Newmar Mountain Aire 4551 Floor Plan

Watch Walkthrough

2026 Newmar Mountain Aire 4551

Sleeps 3

Sleeps 3

3 Slideouts

3 Slideouts

Shop All Newmar Mountain Aire RVs

Newmar Mountain Aire RVs

  • 2026 Newmar Mountain Aire 4118

    6

    2026 Newmar Mountain Aire 4118

    New Class A at Transwest of Belton, MO

    • An icon of a bed

      Sleeps 3

    • An icon of a fuel container

      Diesel

    • An arrow pointing outward from the center of a vertical rectangle

      3 Slide Outs

    • A minimal icon representing a speedometer

      665 Miles

    $942,350 msrp
    • See Details
  • Transwest | Image Coming Soon

    Coming Soon

    2026 Newmar Mountain Aire 4118

    New Class A at Transwest of Frederick, CO

    • See Details
  • Transwest | Image Coming Soon

    Coming Soon

    2026 Newmar Mountain Aire 3825

    New Class A at Transwest of Frederick, CO

    • An icon of a bed

      Sleeps 4

    • An arrow pointing outward from the center of a vertical rectangle

      3 Slide Outs

    • See Details
Shop All Newmar Mountain Aire RVs

2026 Newmar Mountain Aire Features

Newmar
Disclaimer: The features below might not reflect what exactly will be on the vehicle.
Download the Brochure
  • 2026 Mountain Aire's exterior

    Designed to impress

    The Mountain Aire brings bold curb appeal with Newmar’s signature full-paint finish and the optional Onyx Package, which adds dark accents throughout. Dual power slide trays, a slide-out Dometic freezer with optional fridge upgrade, and lighted exterior storage make it both aesthetically pleasing and functional.
  • The 2026 Newmar Mountain Aire's cockpit

    Pilot your ride

    This coach is equipped with Newmar’s Comfort DriveⓇ steering system, providing a smooth and more controlled ride. The anti-glare digital dash displays vehicle information clearly, while a 360° stitched camera system improves visibility in tight turns and narrow spaces. Co-pilot controls feature a touchscreen display for clear navigation and camera views, making this setup ideal.
  • The Mountain Aire's comfy cabin

    Room to relax

    There’s tons of space to stretch out inside the Mountain Aire. The power theater seats feature hidden storage and illuminated cupholders, providing a cozy spot to kick back and relax. The Euro-style dinette features a hidden leaf extension and includes two folding chairs to seat extra guests comfortably.
  • Galley inside the Newmar Mountain Aire

    A convenient kitchen

    The Mountain Aire’s kitchen comes ready for meal prep, both inside and out. A portable dual-burner induction cooktop plugs in easily outdoors or on the counter, and a WhirlpoolⓇ convection microwave with built-in air fryer makes cooking easy. The single-basin sink is paired with solid-surface covers and cutting boards, and the dishwasher is tucked away.
  • Cozy bed in the Newmar Mountain Aire

    Your bedroom retreat

    In the back of the coach, the bedroom is spacious, bright, and is calling your name. A king-size bed with large nightstands features a built-in power station, while wardrobes with six full drawers provide ample storage. A SamsungⓇ Smart TV is positioned for easy viewing, and controls for lighting and shade are conveniently within arm’s reach.
  • Spacious shower in the Newmar Mountain Aire

    Elevated bathrooms

    This coach includes a spacious rear full bath and a convenient mid-ship half bath. In back, you’ll find a tiled shower with a rain-style head, built-in bench, extra headroom, and a water-saving system for off-grid travel. A stacked washer and dryer are also tucked into the rear. The half bath adds flexibility for guests.
    • 2026 Newmar Mountain Aire washer and dryer
    • 2026 Newmar Mountain Aire dinette
    • Bathroom in the 2026 Mountain Aire
    • Exterior of the 2026 Mountain Aire

    Explore Walkthrough Videos

    See All Videos
  • Preview image of 2026 Newmar Mountain Aire 4118 Blacked Out youtube video 1:08:12 Featured
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    Walkthrough of 2026 Newmar Mountain Aire 4118
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  • Preview image of 2026 Newmar Mountain Aire 4551 (17N253130) youtube video 11:45 Featured
    Walkthrough of 2026 Newmar Mountain Aire 4551
    By Marc Webel • 3 months ago 594 views
  • Preview image of 2026 Newmar Mountain Aire 3825 Luxury 525 Horse Power RV youtube video 1:08:07 Featured
    Walkthrough of 2026 Newmar Mountain Aire 3825
    By Katie O'Neil • 4 months ago 3.6k views
  • See All Videos
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    Featured Article

    What is a Newmar Authorized Dealer?

    A little bit of background on Newmar Mahlon Miller and Marvin Newcomer founded Newmar Corporation in 1968 in Nappanee, Indiana. Before Newmar, both men worked for another RV manufacturer, but they...
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    Exterior front of the 2025 Newmar Essex

    Frequently Asked Questions

    Who builds the Mountain Aire?

    The 2026 Mountain Aire is built by Newmar, a trusted name in luxury motorhomes for more than 50 years.

    What kind of engine does the Mountain Aire have?

    The Mountain Aire is powered by a 525-horsepower Cummins X12 diesel engine with 1,695 lb-ft of torque, paired with a Spartan K3 tag-axle chassis.

    Is the Mountain Aire a good fit for full-time RV living?

    Absolutely! With home-grade appliances, plenty of storage space for your belongings, and a power-packed diesel engine, the Mountain Aire supports your full-time adventures on the road.

    Find a Transwest Dealership Near You

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      Right Arrow Location Icon 17327 S Outer Rd
      Belton, MO 64012
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      Right Arrow Location Icon 2224 Sanford Dr
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    Explore the 2026 Mountain Aire at Transwest

    Ready to experience the Mountain Aire difference? The 2026 Mountain Aire brings together power, comfort, and cutting-edge design in one unforgettable package. Browse our online inventory or visit us in person at Transwest.

    Explore other Newmar models

    Newmar has a range of models and sub-models. Discover the best Newmar RV model for your needs.

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    *Estimated payment is based on vehicle price (excluding taxes and fees) and associated lender rates for qualified buyers, term length and any associated trade-in equity or down payment from buyer. Terms may vary. To see if you qualify for specific financing discounts, please contact your local Transwest dealership.

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