Call us!!(218) 550-5614

Les Grumdahl Window and Siding LLC

Les Grumdahl Window and Siding LLC

Special Offer Today! $100 Off

Each Window Installation With Purchase of 5 or more windows.

Contact Retailer for Details

* Required field

Ranked #1 in Customer Satisfaction
with Window and Patio Door Manufacturer Brands

For J.D. Power 2019 award information, visit

Infinity Replacement Windows

Infinity Windows from Les Grumdahl Window & Siding in Duluth, MN

Les Grumdahl Window & Siding is a replacement window company trusted by residents of Duluth, MN to provide top quality products and first-rate service. Our goal is to help make your home feel more comfortable & energy efficient, all while delivering a home remodeling experience that is smooth and stress-free. Aside from Infinity replacement windows from Marvin, Les Grumdahl Windows & Siding also specializes in siding.

Infinity fiberglass windows can help to immediately decrease your home’s energy costs. Lab tests show that almost half of the energy used to heat or cool your property can be lost through poorly insulated doors and windows. Duluth and surrounding area homes with drafty windows suffer from high energy bills. The combination of poorly fitted frames, inefficient glass and porous wood or vinyl frame materials combine to waste the money you spend to keep your home safe and comfortable.

Infinity replacement windows can have the texture of traditional wood or a smooth, molded surface but are a more efficient option in comparison to traditional wooden windows. Ultrex® fiberglass technology makes these windows energy efficient and tough, as strong as low carbon steel and 8 times stronger than vinyl so they will open and close like they should every single time. These windows remain weather tight and stable in all climates even in the middle of winter, reducing the risk of air leakage thanks to the low thermal expansion rate of fiberglass. With this variety of choices, Infinity windows are also customizable to meet the needs of any replacement project. These windows incorporate the details of traditional wood windows without the maintenance, so you will be pleased that your investment was worth from Les Grumdahl Window & Siding.

Learn more about the options and durability of Infinity replacement windows from Les Grumdahl Window & Siding today.

Les Grumdahl Window and Siding LLC
1626 London Rd
Duluth, MN 55812

(218) 550-5614

"We attended the Spring Home Show and looked into 3 different brands of windows. We did our research and were most impressed with Infinity from Marvin. Not only because of the window itself but also because they could match the oak floors, trim, and oak cabinets. Not only did they match it but it looks incredibly beautiful. We chose to add the bow window. It was perfect. Steve was a knowledgeable and sincere salesman. The service was incredible, the installers, more incredible. The team sent up here were meticulous about every fine detail of the installation and very thoughtful about our time, home and space. And...the windows are fantastic. Good investment. Highly recommend them over other name brands."

Infinity Replacement Windows

Infinity windows are custom-built for your home with Ultrex® fiberglass to strike the perfect balance between performance and design.

Infinity Replacement Doors

Infinity doors offer durable Ultrex fiberglass performance combined with thoughtful design features that improve your view.

We'll streamline your entire
replacement project