Business Details
50+ Years
experience
Trusted Wisconsin Replacement Windows & Doors Since 1967
AHT Wisconsin Windows has been a trusted name in Wisconsin home improvement since 1967. Founded on principles of quality craftsmanship and customer satisfaction, we specialize in energy-efficient replacement windows and doors engineered to withstand Wisconsin's extreme climate. Our products feature advanced composite materials that are 400% stronger than vinyl, triple-pane glass technology for superior insulation, and industry-leading 50-year warranties on both products and workmanship. As a family-owned business, we maintain a commitment to local service with in-house installation teams operating across Appleton, Green Bay, Madison, and surrounding communities.Our dedication to innovation is evident in our proprietary solid-core composite frames and patented thermal technologies that deliver unmatched energy savings. We maintain full licensing and insurance while holding certifications from leading industry organizations, ensuring every installation meets rigorous standards. With over 55 years of local expertise, we combine technical excellence with personalized service to enhance home comfort, security, and value across Wisconsin.
Services
Replacement Windows
Entry Doors
Sliding Patio Doors
Storm Doors
Window Installation
Door Installation
Energy-Efficient Solutions
Custom Window Design
Window Repair
Door Replacement
Details
- Year established: 1967
Highlights and features
- We offer composite window frames 400% stronger than vinyl with 214% better insulation
- Our 50-year transferable warranties cover both product and workmanship
- Factory-trained installation teams ensure perfect fit and performance
- Triple-pane glass technology reduces energy costs and noise transmission
- Locally owned since 1967 with deep understanding of Wisconsin weather challenges
Associations and certifications
- ENERGY STAR
- National Fenestration Rating Council (NFRC)
What people say
Look great
No mess
Warmer rooms
Professional installers
Energy savings
Services
Replacement Windows
Our composite replacement windows feature solid-core frames 400% stronger than vinyl with triple-pane glass technology. These energy-efficient solutions reduce heat transfer by 214% compared to vinyl windows, featuring Low-E coatings and gas fills for optimal insulation. Backed by a 50-year warranty, they require no painting or sealing while maintaining structural integrity in extreme Wisconsin weather conditions.
Entry Doors
Custom entry doors combine 22-gauge steel or fiberglass construction with adjustable hinges and compression seals. Available in multiple finishes and glass options, these doors enhance security with multi-point locking systems while improving energy efficiency through insulated cores. Each installation includes a 50-year warranty covering both product and professional installation workmanship.
Sliding Patio Doors
Triple-pane sliding glass doors feature steel reinforcement and warm-edge technology for superior thermal performance. Custom sizing options ensure perfect fit for unique openings while the monorail gliding system enables smooth operation. Security features include multiple-point locks and step locks for enhanced protection against unauthorized access.
Storm Doors
Aluminum storm doors with triple-seal weatherstripping reduce air infiltration while protecting primary entry doors. Available with self-storing glass panels and durable powder-coated finishes, these doors enhance energy efficiency through thermal break technology. Standard features include mortised hardware and overlap strike plates for structural reinforcement.
Window Installation
Factory-trained technicians ensure precise window installation using proprietary composite framing systems. The process includes interior and exterior sealing with adjustable thresholds and compression weatherstripping. Each installation comes with a 50-year workmanship warranty, guaranteeing proper function and energy performance for decades of reliable service.
Questions
How long have you been in business?
We've served Wisconsin homeowners since 1967, operating as AHT Wisconsin Windows since 2000 with the same family ownership.
Do your windows require maintenance?
Our composite windows are virtually maintenance-free with no need for painting, sealing, or staining due to their durable construction.
Are installations done by subcontractors?
No, we use only our own factory-trained installation teams to maintain quality control and service standards.
What makes your windows energy-efficient?
Triple-pane glass with Low-E coatings, krypton gas fills, and composite frames create superior insulation properties.
Do you offer financing options?
Yes, we provide low payment financing options to make home improvements more accessible for Wisconsin homeowners.
Are your warranties transferable?
Both our 50-year product and workmanship warranties are fully transferable to new homeowners within the coverage period.
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