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Hope this is a known one. New double glazing should be labelled, shouldn't it? But rather than getting new windows, are my uPVC windows fine? What checks? To elaborate - what should I look at on the windows as a means of checking they are adequately energy efficient so I don't need to buy replacements.

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They're not. They're windows, by design they are not energy efficient. –  Tester101 Apr 26 '13 at 16:00
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Have you checked your windows for any weak spots? a professional can measure the amount of sunlight passing through the panes, and this can lead to potential treatments or simply being told the windows are fine. To Repair or replace if you do find faults becomes the dilemma? Down to costs and as mentioned above, replacement uPVC can be very expensive. If you look after your uPVC windows then they should be fine. Look for signs of improvement being needed. Rot won't be an issue as you have uPVC though do check for worn out cranks and foggy double pane glass. Essentially, professionally placed glass should be maximising solar heat during winter and minimising in Summer. The most energy efficient glass for double glazing is low emissivity (Low-E) glass. It limits the amount of heat escaping through windows. Have your windows checked so you can have peace of mind.

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Read my answer on the following question -

How can I measure the r-value of a wall?

This method works really really well for windows because of the temperature differences. Also if you do this in the middle of the summer/winter it would be optimal. Other thing you can do too for windows is take a temperature reading in the middle of the window and compare it to the temperature along the window edges (winter works best). You would be measuring how well your windows are sealed, how well the windows fit in the frame, and the caulk job but that is important too.

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Hire someone that can do an energy audit. Check with your local utilities as they may even offer rebates on the cost of that. They'll use a Thermal Imaging Camera that can answer this question for you.

It's not so much whether or not your windows are a problem as much as it is the bigger question "what parts of your house are the problem". Even if your windows aren't efficient, you may have bigger issues elsewhere that will give you a bigger ROI in terms of energy costs than replacing the windows.

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I agree. Replacing windows is expensive. It's likely there are many better ways to spend money for energy savings, unless the windows are egregious or need to be replaced anyway. –  Henry Jackson Apr 26 '13 at 18:53
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+2. If they are dual glazed, they are adequate enough, money is better spent elsewhere. Unless dual glazed units are defective in some way, single glazed units are the only ones worth replacing. –  bcworkz Apr 26 '13 at 22:15
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