Locally Designed, Manufactured, and Installed,
Energy Efficient Windows & Patio Doors
(609) 881-2400

Factory and Showroom at 230 Route 70 East Medford, NJ 08055


Determined to produce a superior line of replacement windows and patio doors, Jantek assembled an internal team of design and manufacturing experts. They invested in state-of-the-art equipment and built their manufacturing process around producing beautiful, well-made, energy efficient products.

This intelligent engineering approach allows Jantek to continually improve their products to ensure that only the best products are offered to their customers. 


While Jantek never used high-pressure sales tactics, the 2019 pandemic protocols (when in-home quoting was no longer permitted) forced them to rethink their sales process.

Jantek was fortunate to be in a unique position. Unlike other replacement window businesses, Jantek manufactured their own products. Pricing was stabilized, because it wasn't based on the ever increasing costs from industry manufacturers. The quote could include installation because Jantek doesn't sub-contract work, and instead employs an in-house team of expert window installers.

This means that a sales visit is not needed. The on-line TeleEstimate form is easy to fill out, so getting a quote takes minutes, not days. 


Established in 1995, Jantek's mission was to offer well made, energy efficient replacement windows at a fair price to customers.

Jantek built their business foundation on offering homeowners superior products and honest pricing. They never engaged in high pressure sales or deceptive marketing tactics.

In 2022 Jantek introduced their EnergyMiser product line.

This entailed incorporating proven advancements in window technology into the materials used. Units were submitted to independent lab testing to verify the insulation performance ratings. The results can found on the product specifications tabs. EnergyMiser features include:

EnerCore Sashes

Fusion Welding

Triple Plane, Argon Filled Glass

RoBo Sync single point control point

Jantek is committed to continuous improvement.

It is because of this, that Jantek has satisfied customers who refer them to friends and family.  

Please note: Because we manufacture our own line of windows and patio doors, we are not equipped to provide service on products that are not ours.

For service on Jantek products, visit: https://www.jantekllc.com/store/Default.asp

  • Southern New Jersey
  • Central New Jersey
  • Camden County
  • Ocean County
  • Atlantic County
  • Gloucester County
  • Mercer County
  • Monmouth County
  • Philadelphia, PA
  • Bucks County, PA


We welcome visitors to our showroom Monday through Friday- 9:00am-5:00pm.

Our EnergyMiser Windows and Doors are our Best Rated Replacement Windows. We encourage you to compare our prices, energy ratings, and product value before you buy.

What Our Customers Have To Say

We purchased 8 windows upstairs and sliding glass door for the back! The windows are beautiful and keep the cold out! Excellent windows. They go up and down easily and fold in for easy cleaning! Not heavy! Smooth! Excellent product! Thank you Jantek!

Michelle Bonomo Savino

via Facebook
I used Jantek to replace 12 windows and they did a great job. There was no high pressure sales and all measurements and installs were done on time and met all Covid requirements. I would definitely recommend!

Duane Jones

via Facebook
I recently had 3 windows replaced by Jantek and am very happy with my purchase. They were very responsive during this crazy Covid time, answered all my questions and did great quality work... I would definitely recommend their to others!

Laüren Skrabonja Davis

via Facebook
The reps that replaced all 23 of our windows were on time both days and efficient. They were mindful of cleaning up after themselves as they completed each window. All around it was a great experience.

Chase Hendrickson

via Facebook

Learn why this retired couple decided it was time to replace the windows in their authentic log cabin.

Hear what their experience was working with Jantek.

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