If you're replacing your windows to improve your home's looks and comfort, by all means, choose high-efficiency multiple-pane models with low-E film or coating and an inert gas filling. Your energy savings should quickly off-set the cost difference between these and low-efficiency single-pane units.

But, if your goal is simply to increase efficiency, there are far more cost-effective things you can do—including installing storms over your existing windows, making sure the existing windows and frames are sufficiently caulked and weatherstripped, and insulating your walls. And remember, insulating your walls could qualify you for CWLP's Super-Charged Insulation Rebate.

For more information about window efficiency, contact the Energy Services Office.