U-factor of a window

kelly220

Hey all! What is ”U-factor” of a window? How do you judge on this U-factor while purchasing a new window?

Miaelizabeth1254

U-factor is the rating given to energy efficient windows. It is the rate of transfer of heat. It measures the insulation value of the window. Always windows with low U-factor is always preferred, because they do not allow heat to transfer through them easily and hence keep the rooms cooler. A question might arise whether a lower U-factor will be suitable for houses in cold climate. But lower U-factor is preferable in any type of climate. A U-factor value of around 0.3 is always good. Vinyl clad doors have a very low U-factor http://www.windowchoice.ca/doors . They are suggested by experts for houses nowadays.

mechanicaljen

Admittedly, it is difficult for me to not nerd on this and start busting out proof equations.

The climate you live in would dictate the value of a more expensive, low U-factor window.

Hawaii?  It's worthless.  North Dakota...get the best you can afford.