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I live in a 40+ year old house near Houston. Some of the windows are about 6 years old, and some are probably original. What I'm trying to figure out is what is "acceptable" heat loss/gain, as I am trying to decide whether shell out a bunch of cash to replace the windows.

For instance, if the outside air temp is 30 degrees, and the inside temp is 70 degrees what temp should I see on the inside of a well made energy efficient window. Conversely, if the outside air temp is 95, with direct sun, and the inside temp is 72, what temp should I see inside.

I'm measuring the temp using a B&D Infrared Thermometer.
 

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Copied and pasted from my buddy Oberon:

Some real numbers:
When it is 0°F outside and 70°F inside and you have very little wind, the interior surface temperature of a single pane of glass is going to be right about 16°F; which is definitely going to contribute to those convection currents.

Add the second lite, be it storm or dual pane and you increase the interior glass surface temperature to 44°F. That is a very significant improvement. And once again, that is not simulation, it is real measurement data.

Add the LowE coating in a dual pane and the temperature of the glass surface increases to the mid 50’s F (53°F – 57°F) depending on the coating and the glass surface that has the coating.
 

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What did you get?


Weren't you looking at Oknas before?

Did you go with triple pane?
they are called CLIMATE GUARD. but, you know, that some factory somewhere, makes a window, then puts who knows how many different names on it.
they are sliders, and while they are ok, i wish i would have gone casements, oh-well. they are a decent quality and are working well for me. they don't leak at all.

i was looking for what you guys recommended. not to be found, by me anyway.

no. they are a basic dual with low-e. nothing fancy.
 
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