Energy Savings is the hallmark of window performance and Thermolock takes its commitment to providing energy efficient products very seriously.

First, Thermolock products are designed with performance in mind. Thermolock uses the highest quality PVC Vinyl and energy efficient multi-chambered designs from Veka, a world leader in the window industry. Thermolock windows meet industry performance standards set forth by independent agencies like the American Architectural Manufacturers' Association (AAMA) and the National Fenestration Ratings Council (NFRC).

Every Thermolock window is custom measured and manufactured to fit a specific opening. When properly installed, Thermolock windows eliminate drafts from coming in around the window.

But proper fit is only the beginning. Thermolock is an ENERGY STAR partner. This voluntary program managed by the Department of Energy and the Environmental Protection Agency qualifies certain window and door products as ENERGY STAR products.

ENERGY STAR - qualified windows, doors, and skylights save you energy and money, increase the comfort of your home, and protect your valuable possessions from sun damage. They are also better for the environment because lowering your energy use means less air pollution from power plants.