Double Hung vs. Casement Windows: Energy Savings Case Study

August 12, 2026

Double Hung Windows vs Casement Windows - Kubala Windows

The Great Window Debate for New England Homes

Choosing the right window style for your home is about more than just aesthetics. For homeowners across Massachusetts and northern Connecticut, extreme seasonal temperature swings mean that energy efficiency is a top priority. When upgrading through our replacement windows page, two styles consistently stand out: double-hung and casement windows. But which one delivers better energy savings?

Case Study Profile: A Worcester County Home

To find out how these styles perform in real-world New England conditions, we analyzed a recent project in central Massachusetts. The home featured drafty, 30-year-old wooden windows. The homeowner decided to test a hybrid approach: installing ENERGY STAR-certified double-hung windows on the traditional front facade and airtight casement windows on the windy rear exposure.

Understanding the Mechanics of Energy Efficiency

Casement windows press tightly against the frame when closed, creating an airtight compression seal.
Double-hung windows use interlocking sashes and weatherstripping, which offer great efficiency but slightly more potential airflow points.
Casement windows swing outward, meaning wind pressure actually strengthens the seal against the weatherstripping.
Double-hung windows allow for top-down or bottom-up ventilation, helping manage solar heat gain during mild spring and fall days.

The Real Numbers: Utility Bill Comparisons

After tracking utility usage for a full year post-installation, the results were clear. The home saw an overall 22% reduction in annual heating and cooling costs. Specifically, the rooms outfitted with casement windows yielded a slightly higher draft-prevention metric due to their compression-seal design, saving roughly 4% more on winter heating compared to the double-hung rooms. However, both styles vastly outperformed the original windows.

Choosing the Right Fit for Your Home

While casement windows technically edge out double-hung models in pure airtightness, double-hung windows remain a favorite for their timeless look and easy cleaning. At Kubala Windows, we help homeowners across our service areas balance maximum energy efficiency with architectural integrity. Ready to see how much you could save? Get a free estimate today to discuss your next project.