What is the difference between JELD-WEN 2500 and 4500?

The difference between JELD-WEN 2500 and 4500 series is that V-2500 is entry-level builder-grade vinyl and V-4500 is mid-range premium vinyl with better construction, energy efficiency, and features. JELD-WEN V-2500 Series is budget-friendly vinyl designed for new construction and rentals, featuring thinner vinyl walls with fewer reinforcement chambers, standard Low-E glass with U-factor around 0.28 to 0.32, air infiltration around 0.15, limited color options mostly white and almond, and basic hardware, costing 150 to 300 dollars materials per double-hung. JELD-WEN V-4500 Series is upgraded premium vinyl featuring thicker vinyl walls with more chambers for strength, better energy efficiency with Low-E 366 glass and U-factor around 0.25 to 0.28, improved air infiltration around 0.08 to 0.10, more color options including exterior colors like black and bronze, better hardware and tilt-in cleaning, and enhanced warranty. V-4500 costs 250 to 400 dollars materials, about 30 to 50 percent more than V-2500. Construction wise, V-4500 has stronger frame and sash, better weatherstripping, and improved appearance with narrower frame. For homeowners wanting lowest cost for rentals, V-2500 is adequate. For homeowners wanting better energy efficiency, durability, and appearance, V-4500 is better and worth extra cost, though still below premium vinyl like Okna.