Argon Filled Double Glazing will save 26p / year?

Ok.

I'm in the process of renovating my failed double glazing.

One thought occurred - my MIG welder can use Agron Shielding gas and new windows are argon filled. A gas bottle is =A36 so how much will it save on gas bills....

Well Thermal conductivity (w/m K) Argon =3D 0.016 Air =3D 0.0257

So argon =3D 62% of air (i.e. transmits less heat/cold not surprising since it is used in double glazing!)

If at a first guess I say the average year round temperature dfference between indide and out is 10 degrees C

If my average semi house in the UK has an external window and door area =3D 12m^2

Then I guess window area =3D 8m^2

The difference in thermal conductivities (extra heat conducted by air) =3D 0.0257 - 0.016 =3D 0.0097 (call it 0.01 w/m K)

So 0.01 x 10 degrees (temp diference) x 8m^2 (glass area of house) =3D

Say my heating is on for 3 hours in the morning, 6 in the evening =3D 9 hours/day =3D 9 x 365 =3D 3285 hours/year

so 3285 hours x 0.8 watts =3D 2628 watt hours/year =3D 2.6kw

And at 10p/kwh for electricity cost =3D 10p x 2.6 =3D 26p / year.

I'm thinking filling the windows with argon is not worth it!

If I've made any errors etc let me know. Also this may be a best case scenario since conductivity of the silicone that seals the window I expect to transfer a lot of heat (compared to the air) and reduce the argon's effectiveness.