Imagine a home full of beautiful new windows, then enjoy the benefits of lower heating and cooling bills. Order 7 or more windows, and we'll match your energy efficient tax credit by taking $200 off your bill. Offer good on double-hung and sliding windows.

Click here to learn about all the available window options and manufacturers you can choose from.

Serious windows are being used to upgrade the Empire State Building. They have been chosen as one of the eight individual measures to provide maximum sustainability and energy efficiency in the iconic American landmark.

The retrofit and energy efficiency upgrades that are being done are projected to reduce energy rates by 38%, save 4.4 million per year in energy costs, and pay for themselves in 3 years.  What's more, the upgrades will save 105,000 metric tons of carbon dioxide over the next 15 years.  That is equivalent to the annual emissions of 17,500 cars.  You can get the same kind of efficiency when you order SeriousWindows from Mulligan.

For Mulligan, sustainability is the future, and the Empire State Building is just the start. Our windows, including the SeriousWindows 300, 501, and 600 series, provide consumers with outstanding energy savings and timeless style.

SeriousWindows are the most energy-efficient residential windows on the market today, saving homeowners tens of thousands of dollars over the life of their homes.  They provide beauty, strength, thermal performance, and the maintenance free qualities of finely crafted vinyl.  With an array of colors, styles and designs, you can customize your windows to match the interior and exterior of your home.  This is because at Mulligan, we are determined to provide you with the ultimate product for you residential needs.

But don't take it from us, ask the experts at the Empire State Building. With all the window choices they could have made, they choose SeriousWindows to get the job done.  As a result, the depression-era skyscraper will be more energy efficient than 90% of all office buildings, using half the energy per square foot of an average building.  At Mulligan, we think that's an accomplishment worth writing about.

Learn more about SeriousWindows from Mulligan.