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32 Years
experience
Custom Energy-Efficient Windows for Homes in Bristol, PA
Starmark Evo Windows, a product of HiMark Windows LLC, has been at the forefront of innovative window design for over two decades. Our commitment to excellence is rooted in a homeowner-focused approach that began in 1994 with the founding of OKNA Windows. We specialize in crafting windows using Advanced Polymeric Composite (APC) material, which offers unmatched durability and energy efficiency. Our products meet rigorous industry standards, including Energy Star, AAMA, and NFRC certifications, ensuring superior thermal and structural performance. With a state-of-the-art manufacturing facility in Bristol, Pennsylvania, we combine advanced automation with meticulous craftsmanship to deliver high-quality, customizable solutions for residential applications.

Our windows feature patented designs, such as the HeatSeal Spacer System and EZ Glide Track System, which enhance functionality and longevity. Backed by a Transferable Lifetime Limited Warranty, our products are engineered to withstand environmental challenges while maintaining aesthetic appeal. We prioritize third-party validation through Keystone Certification, providing homeowners with confidence in our claims and product reliability. Our team of engineers applies over 20 years of expertise to continuously refine our offerings, ensuring they meet diverse climate needs through specialized glass packages. From double-hung to bay windows, each product reflects our dedication to innovation, sustainability, and customer satisfaction.
Services
Double Hung Windows Slider Windows Casement Windows Bay & Bow Windows Custom-Sized Windows Energy-Efficient Solutions Replacement Windows New Construction Windows Specialty Glass Options Durable Composite Windows
Details
  • Year established: 1994
Highlights and features
  • Engineered with 20+ years of homeowner-focused design expertise
  • Advanced Polymeric Composite material resists weathering and requires no painting
  • Keystone-certified products guarantee performance claims through third-party validation
  • Lifetime Limited Warranty covers structural integrity and energy efficiency
  • Custom glass packages tailored to regional climate requirements
Associations and certifications
  • Energy Star
  • AAMA
  • NFRC
  • Keystone Certification Program
Update Listing
Services
Double Hung Windows
Our Double Hung Windows authentically replicate classic wood window aesthetics while offering modern performance benefits. The solid APC frame and sash eliminate foam filling requirements, providing exceptional durability and energy efficiency. Rigid interlocks at the meeting rail with dual seals minimize air leakage, while the one-piece sloped sill improves drainage without clogged weep holes. These windows combine timeless design with advanced engineering for smooth operation and lifetime performance.
Casement Windows
Casement Windows deliver superior ventilation and weathertight seals through our patented multipoint locking system. The 90-degree opening mechanism allows full access for easy cleaning and maximum airflow. Featuring folding crank handles and optional WOCD safety latches, these windows blend functionality with security. The beveled screen frame adds architectural detail while maintaining durability in various climate conditions.
Bay & Bow Windows
Bay and Bow Windows create expansive light-filled spaces with customizable configurations of casement, picture, and double hung units. Our engineered solutions include insulated headboards and furniture-grade veneer finishes for structural integrity. Available in multiple angles and combinations, these windows enhance home aesthetics while maintaining energy efficiency through certified glass packages and compression seals.
Energy-Efficient Glass Packages
Our glass packages feature HeatSeal and SunSeal coatings optimized for different climates, with optional argon or krypton gas fills for enhanced insulation. The triple-pane option achieves Energy Star Most Efficient status through advanced low-E coatings and precision spacers. Each unit undergoes rigorous testing to ensure optimal U-factors and solar heat gain control for year-round comfort.
Custom Window Solutions
Custom Windows are manufactured to exact specifications with seven standard exterior colors and unlimited custom paint options. Interior laminate finishes and decorative grids allow personalized design choices. Our precision engineering accommodates unique architectural requirements while maintaining structural integrity and energy performance through automated production processes in our Pennsylvania facility.
Questions
Why should I replace my existing windows?
New windows improve energy efficiency, reduce heating/cooling costs, and enhance home aesthetics through modern materials and designs.
What makes composite windows better than vinyl?
Composite windows resist weathering, never require painting, and maintain structural integrity longer than vinyl alternatives.
How do I evaluate window energy performance?
Check the NFRC label for U-Value, Solar Heat Gain Coefficient, and Visible Light Transmittance ratings.
Do replacement windows pay for themselves over time?
Energy-efficient windows reduce utility bills and maintenance costs, providing long-term financial benefits.
What causes window condensation?
Condensation forms from excess indoor humidity contacting cooler window surfaces, which our warm-edge technology helps prevent.
How should I clean Starmark Evo windows?
Use mild detergent and a soft cloth; avoid abrasive cleaners to maintain the finish and seals.