How effective is Magnetite installation on large South facing windows in reducing domestic heat loss
Are there any objective research findings on this issue?
As I'm sure you already know the south facing portion of your home will be cooler in summer and likely receive no winter sun to warm the room - so I can understand why you'd like to retain heat in the winter!
Other options to reduce winter time heat loss you may want to consider are thick (lined) curtains with pelmet (framework that conceals the curtain fixtures) along with Velcro edging on the curtains/wall to create a tighter seal.
The other benefit of double glazing or retrofit double glazing is the noise reduction (not sure if this is an issue for you).
Have a look on www.yourhome.com.au website, lots of really thorough independent information or come visit Barrett House on the first Thursday of the month (9:30am-12:30pm) to look at the double glazing / retrofit glazing options we’ve installed. Hope that helps?
Hi Margaret, The heat flow through glazed windows or any window for that matter is determined by the combined effect of the type of glass, frame (aluminium or wooden for eg) and seals.
Different frame and glass materials have varying abilities to conduct heat - this is specified by their U-value. The lower the U-value the less heat is transmitted. The U-value can be just for the frame, just the window or both combined. For example an aluminium frame has a U-value of 10 and a timber frame a U-value of 2.8 (Source: www.yourhome.gov.au)>
Windows in Australia are certified for their energy performance (U-Value) by rating organisations who conform to the ‘Australian Fenestration Rating Council (AFRC), make sure you look out for this on any product you might be considering.
The U-Values of 3mm Magnetite (as displayed in Barrett House with timber frame) is 2.5 (75% improvement) for cooling; and 2.6 (80% improvement) for heating.