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We offer two optional Camelot® Performance Packages which feature the latest and most innovative energy efficiency technologies. From Sashlite’s® revolutionary integrated spacer to energy-saving Low-E pyrolytic hard-coat glass options, Camelot® Performance Package windows will help reduce home-heating and cooling costs...while providing you and your family with year-round comfort, dependability and style. Below we provide a brief overview of how environmental factors influence window performance:


1 Convection


When warm air from inside the home meets a cold window, a chilly, circulatory draft can occur. Camelot® Performance Package windows can help reduce convection related problems.


2 Air Infiltration


Air leakage through unsealed gaps can account for up to 10% of the energy usage in a home. Camelot® Performance Package windows offer premium airflow protection.


3 Radiant Heat Loss


Clear glass absorbs interior heat and radiates it outdoors. Camelot® Low-E glass coatings greatly reduce radiant heat loss, saving you money in the winter.


4 Conduction

The direct transfer of heat through the window frame. Camelot® Performance Package windows reduce thermal heat loss due to conduction.


5 Solar Radiation


In the summer months, solar radiation can dramatically increase home cooling costs. In addition, UV radiation can fade and damage interior furnishings.

Camelot® Performance Package windows feature a Low-E micro-coating which greatly reduces solar radiation and provides superior UV protection.


6 Light Transmittance


Camelot® Low-E coatings allow short wave visible light to be absorbed through the window, which reduces lighting costs throughout the year and is reradiated as heat in the winter.


7 Condensation


Condensation can damage window frames, sills, and interior shades while contributing to mold and indoor humidity. Northeast offers warm-edge spacers for superior condensation resistance.


Thermal Transmittance and Resistance (U and R-Values)


Thermal transmittance, also known as U-value, is the rate of heat transfer between the interior and exterior of a window. The R-value of a window, also known as “thermal resistance”, is simply the reciprocal of the U-value (1/U). So if a window has a U-Value of 0.20, it will have an R-Value of 5 (1/0.20).

The higher the R-value of a window, the greater its insulating properties, and thus the greater its energy efficiency. Camelot® R-5 Ultra Performance Package windows feature one of the highest double=glazed R-values in the industry, for the ultimate in energy-efficiency and thermal performance.

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