400 SERIES CONVERSION KITS FOR NARROLINE® WINDOWS

Narroline® double-hung window conversion kits offer a smart solution for upgrading Andersen windows manufactured between 1968 and 2013.

These kits transform your existing units into modern tilt-wash double-hung windows with High-Performance Low-E4® glass — all without removing the frame or modifying interior trim.

As an Elite Certified Contractor for Andersen, the highest level of Andersen contractor certification, ARDMOR Windows & Doors is trusted to deliver expert installation that aligns with the manufacturer’s specifications. This certification confirms our deep knowledge of Andersen products and ensures that every conversion is completed with precision, reliability, and long-term performance.

KEY BENEFITS

Improved Energy Efficiency
Each conversion kit includes High-Performance Low-E4® glass, which offers up to 45% better energy efficiency in winter and 56% in summer compared to standard dual-pane glass.* This upgrade helps reduce heating and cooling costs year-round.

Convenient Tilt-Wash Design
The tilt-wash feature makes routine cleaning easy by allowing access to both sides of the glass from inside your home ‒ no ladders or exterior access required.

Customizable Style
Enhance your window’s appearance with optional upgrades such as decorative hardware, grille patterns, exterior trim, or specialty glass including art and patterned styles.

Hassle-Free Installation
Designed to fit your existing opening, each kit includes new upper and lower sash, balancers, jamb liners, and hardware ‒ no need to alter the window frame or interior trim. This means faster installation with minimal disruption to your home.

HOW TO KNOW IF YOU HAVE A NARROLINE WINDOW?

If your windows have these four features, they’re compatible with the 400 Series tilt-wash conversion kit.

DOUBLE-HUNG CONVERSION KIT OVERVIEW

*Values are based on comparison of Andersen® double-hung window conversion kit SHGC to the SHGC for clear dual pane glass non-metal frame default values from the 2006, 2009, 2012, 2015 and 2018 International Energy Conservation Code “Glazed Fenestration” Default Tables.

GOOGLE REVIEWS

ARDMOR Windows & Doors4.8

Based on 1874 reviews

Lincoln H.

12 hours ago

Beth B.

3 days ago

I hired ARDMOR Windows to replace 19 windows in my Aldan home. The salesman Mike was polite and thorough. The installation team (Dima, Nico and Ox) were fantastic. Efficient, communicative, and mindful of my property. Overall it was a great experience, I would highly recommend this company.

Dan K.

3 days ago

Dave

4 days ago

I worked with the Willow Grove store. Had window glass replaced in five windows. Cheryl kept in touch with me on a regular basis even though, once she was out sick. Danielle also was a great help. They are a credit to your company. As soon as the glass arrived they got on the job right away and the end result was clean and professional. Verry happy with the work! Will definitely use them the next time. Thanks!

Andy

4 days ago

Easy process with fair pricing for a single hung upper sash replacement. I recommend.

Olivia M.

4 days ago

Great service! So fast

Bruce G.

5 days ago

The door was exceptionally well made and the installation was perfect. My wife and I are extremely happy about the whole project. Thanks again

markel C.

5 days ago

Grant P.

1 week ago

Entire team very professional and happy with output. Some miscommunication on specifics of the order but although frustrating at the time it was likely my oversight and I am hoping to resolve it after the fact and just order an additional two storm windows. Overall, I had 5 replacement windows and 27 storm windows installed. The 4 original windows in basement were from 1940 and the result and additional light makes me want to finish off the basement! I told them that they should have had before and after photos for marketing purposes. The aluminum storm windows are certainly not cheap but compared to replacing all the original multipane windows I think pricing was reasonable given installation and everything. They blend more seamlessly than I had originally thought they would and so keep the original architectural details in place. Brand new windows would have been nice but don’t regret my choice at all. Also appreciated that the installers replaced two broken original panes as a courtesy. Now here’s to hoping they reduce heat loss in the Vermont winters compared to the original single panes. I should add, I believe they got a business license in Vermont specifically to do my job in Brattleboro and are hoping to expand their service area. They deserve to be successful I their efforts in my opinion.

Karen J.

1 week ago

Dima did a fantastic job with my door installation. Prompt, professional, and great work!

Dan R.

1 week ago

Everything handled professionally and efficiently. Good results

Jeffrey K.

2 weeks ago

Windows look great now

Donald C.

2 weeks ago

Great service and installation.

barry L.

2 weeks ago

A Y.

2 weeks ago

Nice window and the price was very very reasonable

Ari W.

2 weeks ago

Got the job done on time.

Michelle D.

2 weeks ago

Steve M.

2 weeks ago

Repaired several single hung windows for me in the summer. Some of the pivot shoes, latches broken due to the hot sun. They also replaced a few screens for me. The job was done in a timely manner. They visited three times for estimates, measurement, and repairs. Every worker was professional. I would still use them in the future. One small thing is the tension on the new window balance is weaker, so a few repaired windows always slide an inch below the position I wanted, but not impact overall function.

Forward H.

2 weeks ago

We had a window panel broken and asked Ardmore Windows to fix it. They are responsive, on time, and professional. Great work done. highly recommended.

Bill W.

2 weeks ago

From the original estimate through to the workers on-site, an all around good experience. Arrived when they said they would, worked quickly and quietly, and kept the house clean. Highly recommend. UPDATE: Hired them again to do some additional repair/replace; different workers but same great experience - professional, friendly, efficient

Bill W.

2 weeks ago

Arrived on time as promised; workers were friendly, professional and efficient. Install went well and they cleaned up everything when finished.

Maria P.

2 weeks ago

The workers were pleasant,respectful,on time and worked very hard to complete a very hard job of repairing window sills. Cost was affordable and would hire again. Definitely would recommend! I'm from Piscataway,New Jersey.

SHERRY

2 weeks ago

I highly recommend Ardmore Windows in Willow Grove! From the very first phone call through the completion of the installation, every step of the process was handled with exceptional customer service. One thing that really impressed me was their attention to detail. After the initial measurements were taken, the company scheduled a second person to come out and verify them. That extra step gave me confidence that everything would be done correctly. The two gentlemen who installed the windows were professional, courteous, and respectful throughout the entire installation. They were a pleasure to work with and represented the company well. Most importantly, when I expressed a concern I had after the installation, Ardmore Windows addressed it immediately and without hesitation. Their responsiveness and commitment to customer satisfaction truly set them apart. If you're looking for a company that values quality workmanship and outstanding customer service, Ardmore Windows is an excellent choice. I would not hesitate to use them again!

Andy

2 weeks ago

Fair price for upper sash replacement. Everyone was very nice and professional that I dealt with. I recommend.

Free In-Home Consultation

We are passionate about resolving window issues for our customers. In order to study the problem in detail and advise the best strategy for a solution, we are happy to inspect the situation on-site at your home. The free in-home consultation allows customers to…

Fast and efficient consultation sessions.
Onsite inspection of your windows.
We do not require all decision-makers to be present.
Select your favorite style and color windows

FREE Home Consultation

Many consultation requests require customers to send digital images of the project.

OTHER BRANDS WE REPLACE

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ACCURATE QUOTE & PRICING

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ARDMOR ADVANTAGE

ARDMOR provides professional window repair, glass replacement, and door installation services across PA, NJ, NY, DE, and other states. As a licensed and insured contractor, we deliver factory-certified installation for Andersen, Marvin, Pella, Oknoplast and other leading brands. Here are the advantages of working with ARDMOR:

LICENSE & INSURED
FACTORY CERTIFIED PRO’S
ACCURATE QUOTE & PRICING
WIDE ARRAY OF BRANDS & OPTIONS

400 SERIES CONVERSION KITS FOR NARROLINE® WINDOWS