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Infinity From Marvin Glass Options


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Decorative Glass

Specialty Glass


Tempered Glass

Increases glass strength to help prevent breakage. This option is ideal for windows that are close to the floor or located in high-traffic areas.


Laminated Glass

Even more durable than tempered glass, laminated glass is often referred to as impact resistant or safety glass due to its vinyl interlayer that tends to remain in place when cracked.



Sound Transmission Class and Outdoor-Indoor Transmission Class Glass has increased pane thickness, ideal in areas where exterior noise is a concern.

Low E Insulating Glass Coatings

Extremely thin coatings of special low emissivity (Low E) metallic material are applied to glass panes to boost their energy efficiency and block out UV rays. Since glass choice plays a big factor in window and door efficiency, your local Infinity partner can provide recommendations on the best selection for your home.

Low E1

Primarily used in colder climates, Low E1 allows more heat in to warm a room while blocking heat loss.

Low E2

By reflecting heat back to its source, Low E2 offers year-round performance in moderate climates. Low E2 will help retain heat in your home during the winter and keep heat out during the summer.</span

Low E3

Low E3 is formulated to reject solar heat while letting light in, resulting in increased performance in climates with intense sun exposure.

Low E3/ERS

With an extra metallic layer on the room-side glass to reflect escaping heat back into the room, Low E3/ERS provides maximum efficiency year round in all conditions.


According to HomeAdvisor, 25% of the costs for heating and cooling your home comes from the energy lost through your windows.

Carefully considering which type of window is right for your home could save you thousands of dollars in energy costs, while increasing the resale value of your home.

Also, independent market studies have noted that 65% of service related issues to prematurely failed windows are related to improper installation. This is due to:

  • short cuts during the installation of new or replacement windows
  • low-cost faulty sealants
  • improper flashing methods
infinity from marvin replacement windows nex-gen windows and doors

What are the best replacement windows for my home?

We’re making it easier for you to buy replacement windows and doors by sharing what to expect during your project. Learn more about how you can find the best window for your home.


1. Expert Consultation

A Nex-Gen windows and doors expert will provide a complete consultation to determine your specific needs — including climate considerations and other factors. They will answer all your questions and provide a detailed, custom project quote based on your specifications.

2. A Perfect Fit

We’ll review your order, measure your openings and verify your installation needs. Your windows will then be built to your exact needs and measurements.

3. Seamless Installation

We’ll remove and dispose of your old windows, and replace them with your custom Infinity windows.

4. Built for Life®

From our Limited Lifetime Warranty to unparalleled customer service, we go above and beyond to ensure your windows provide a lifetime of optimal performance.


At Nex-Gen we’re changing the way Window & Door replacement has been done in the past. Our Expert Staff will provide industry leading solutions for your home improvement needs. The right product for your budget and desired functionality. Our promise is to provide a low pressure, educative consultation while allowing you to be the judge to make the right decision for your homes’s needs.

  • 1

    Let’s Begin

    We start with a phone call to collect information about your home, your replacement needs, and your goals. Every project is unique; we learn as much as we can upfront to ensure a successful remodel experience.

  • 2


    We visit your home to get a first-hand look at the project and to familiarize you with our process. We discuss products and innovative solutions, and provide a transparent cost vs. value analysis and detailed proposal.

  • 3


    Our Elite Window Experts take meticulous measurements to ensure a smooth installation. Accurate window measurements also maximize energy efficiency and protect the aesthetics of your home.

  • 4


    You stay informed with periodic updates via phone, email or text. Scheduling changes are sometimes unavoidable due to the manufacturer’s date changes or inclement weather. We keep you posted in real time.

  • 5


    Our installers come and go with minimal disruption to your routine. No need to leave your home; most installations are completed in 1-2 days. Our crew members receive special training and pass background checks.

  • 6


    Upon completion, the lead installation tech does a walk-through final inspection. He provides operating instructions for your new windows and doors and reviews the warranty information.

  • 7

    Let Us Know

    We ask that you complete a survey as the final step in our process. Collecting feedback about your experience keeps us on our toes. If we didn’t meet your expectations, we want the opportunity to make it right.


To start we have 39 windows in our home. We did start with another big company and were so disappointed in their customer service (several day to answering or get back to us along with no one coming out to check out the problems)
so we decided to try out Nex-Gen (AMAZING) they came out as scheduled, measured several windows and gave us an estimate. We placed our order, had them installed. The guys had a few issues because we have an older home but worked through them with happy faces and great attitudes.

The windows look great. We also had an addition put on to our home but, used Nex-Gen to install their windows. We did have a problem with one subcontractor who damaged one of the windows during the construction of the addition so we called Nex-Gen to come and fix the problem they came right out and fixed it. We are now adding a big picture window along with five other windows. We will NEVER use anyone else, Nex-Gen has our loyalty for life.

Diane S.

better business bureau accredited business nex-gen windows and doors
infinity from marvin replacement windows nex-gen windows and doors


better business bureau accredited business nex-gen windows and doors
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“Serving Northern Colorado From Fort Collins to Denver, Estes Park to Greeley – We’re here for you.”

Improving your home, Windows, Doors, Siding Installation