Energy Efficient Windows  |  Tax Credit/Rebate

Energy Efficient Windows

Will new windows eliminate condensation?

Condensation is a direct result of interior humidity and the difference between indoor and outside air temperature. If you keep the humidity in your house low, then the likelihood of experiencing condensation is also low. However, the efficiency of your window will also impact the temperature and humidity level at which condensation occurs. Energy efficient windows will help reduce condensation. Here's why: high performance windows with low U-factors result in inside glass surface temperatures much closer to the room air temperature. Windows with warm edge technologies and non-metal frames are also less likely to have condensation on the frame or at the edge of the glass. Insulated "superwindows" with three or more layers will virtually eliminate condensation on the interior surface of the glass -- even under extreme cold weather conditions.

Note that in certain conditions (humid mornings after a clear night sky), some superwindows may have dew on their outside surface. These windows are such good insulators, the dew is condensing there just like it does on an insulated wall.

Tax Credit/Rebate

Do I qualify for the Tax/Credit Rebate of up to $1500?

Products Purchased before June 1, 2009

Criteria: Windows, doors, and skylights purchased before June 1, 2009 must meet or exceed the prescriptive criteria established by the 2001 Supplement of the 2000 International Energy Conservation Code (IECC) or the 2004 Supplement of the 2003 IECC for the climate zone in which the product is installed.

Documentation: For windows and skylights, homeowners may use either ENERGY STAR labels or manufacturer certification statements to document eligibility for the tax credit. Doors are required to have a manufacturer certification statement.

Products Purchased on or after June 1, 2009

Criteria: Windows, doors, and skylights purchased on or after June 1, 2009 must have U-factor and Solar Heat Gain Coefficient (SHGC) ratings of 0.30 or less. These ratings must be certified by the National Fenestration Rating Council (NFRC). Look for the NFRC label. NFRC is the only federally recognized organization for determining the energy performance of windows, doors and skylights. Please see the NFRC website for information concerning product performance.

Documentation: Homeowners must obtain a manufacturer certification statement to document window, door, or skylight eligibility for the tax credit. If the retailer or installer cannot provide this document, it may be available on the manufacturer's Web site.