Double or Triple Glazed Windows?

TRBob · 2023-01-03T10:37:03Z

Firstly, apologies I cannot see an appropriate place to post this, I'm going with ASHP as that is what I have. So far in our 1983 built house which we renovated and moved into last year we have replaced the two front bedroom windows with modern double glazed units, as they were letting air/noise in, one could just be opened even when locked. The rest of the house is double glazed with what looks to be quite old double glazed units which are ok for now but we aim to do everywhere as we can afford it. When I started the renovation I was warned off triple glazing as apparently modern double is almost as good and is lighter/cheaper. I've read all sorts of different view points online and am interested to hear from people with ASHP. The recent cold snap highlighted what needs to be done as a priority; The lounge, a bay window - thinking about doing away with if it's not too much hassle as the top and bottom will not be insulated, gets condensation the worst by far. At the other end is a north facing, sliding patio door with metal frame that gets condensation. When we replace, we're not sure what to go with, bi-folds are nice, but I hear that they are very expensive. Personally I'm not that bothered about having the whole space open in summer. The main bathroom, north facing window, two external walls, it got noticeably colder compared to the other upstairs rooms (the en-suite next door being the main basis for comparison) despite having a large new radiator that does get hot. I am considering a triple glazed unit here if no where else. To address the condensation I mentioned, since the temperature dropped we got really bad condensation on the windows, so I got a heated PIV installed which cured the upstairs overnight, even when set to full which is supposedly for a much bigger home we still had a significant amount downstairs, so I've set it lower so that it keeps upstairs clear. My gut tells me that it's the old cold windows that are the issue, not the PIV as my study (was internal garage and now probably the most well insulated room in the house) which has a brand new double glazed unit is always bone dry and doesn't get overly warm as the radiator is at the end of the heating loop. Also we have powerful extractors in the bathrooms and always use the extractor when cooking. I've tried using the de-humidifier downstairs, but its reading a pretty low humidity after a short period.

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TRBob

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Topic starter 31/07/2025 11:09 am

@toodles Glad to hear things are progressing well for you.

I opted for Triple Glazing, they are Argon filled 4-12-4-12-4 Clear Softcoat Triple Black Thermal.

We still have some more to do as funds allow, but the ones that have been done are great, glad that I got them done.

Mitsubishi Ecodan 8.5kWh
4.4kW Solar PV
5.2 kWh Battery Storage
1983 build, 300mm loft insulation, cavity wall insulation (beads)

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