Heat transmittance is brought about by Radiation of electromagnetic waves travelling at the speed of light hitting the building and the heat thus produced being conducted into the house. Radiation (InfraRed) itself does not have a temperature. Heat transmittance in a building can be calculated as follows:
Φ = A × U × (T1 - T2)
where Φ is the heat transfer in watts, U is the thermal transmittance, T1 is the temperature on one side of the structure, T2 is the temperature on the other side of the structure and A is the area in square metres.
I would recommend using the following glazing-- Solarvue for summer use and Low E for winter.
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