windows misting on the outside

bob_a_builder

A quick check tonight with the IR thermometer shows the 'new' window ( the right hand side) measured from inside, that glass is 1 deg C colder than the left ( the upstairs windows in picture in my 1st post on this issue)

The other window which I said had the problem is showing equal temps on both  Left & Right 
So I need to double check level of outside misting again on that window to see if that was correct or I was getting mixed up

Both of those replacement windows where not really a 'considered' purchase, it was the case of a neighbor having some blown windows done, so asked his chap to do a couple of mine , so there was no spec as such, so could have been sold a 'pup'

Re Glass thickness : difficult with out taking the units out of the but visually comparing  the gap between the leading on front and back out outer glass between new and old - looks very similar to me

Bendy_House

Curiouser and curiouser.

Are you brave enough to take readings of the OUTSIDE surface temps?! I think that is the only reading that will help. Inside surface pane temps might not.

For instance, a cool INSIDE window pane temp could be for two reasons, one good, one not so.

'Good': 'K' is apparently a coating on the inside, which reflects heat back in to the room. In which case, if you took the temp from the INSIDE, then I 'think' the K surface should register a COOLER temp? 

'Not good': there is no coating, so a lower INSIDE surface temp is simply due to the unit being cooled more from the outside. Ie, it's less effective.

Would that be the case?! 

I'm really unsure about the operation of the coating, and how this would manifest itself with a thermometer! I'm trying to relate it to one window surface being coated in shiny foil, and another not, or even painted black to increase the contrast. Temperature readings might be counter-intuitive; the reflective surface, I think we can agree, would prevent more heat from passing through the pane, but a temp reading from the inside would show a LOWER reading? The black surface would be absorbing a lot more heat and transferring it to the outside, and an internal temp reading would be HIGHER?

So there could be TWO reasons why an INTERNAL pane temp reading can be cooler: one is that it's effective at not stealing heat from a room, and the other is that it's pants at insulating the cold from the outside.

Ergo, your internal readings MIGHT not be telling us anything useful

But, I don't know.

What SHOULD be useful are outside pane surface temps.