Storms over Thermopane Windows

I have installed single pane/solid storm windows over Anderson thermo pane double hung windows. The Anderson double hung windows leak because they face the lake and receive prevailing winds. I have two questions:

1. The storm windows will fog up when it is cold outside and warm inside even with small drain holes at the base. Should this be happenning ?

2. Is it not a good idea to install solid storms over a thermopane double hung windows ?

 

Question 1, answer. yes that will happen

Question 2, answer. No it's not a good idea to install over insulated windows.
What could happen is you could build up to much heat between the stormwindow and your anderson window and cause a heat crack or make the seal fail, making your insulated window fog up.

I would check the weather striping on your anderson windows and replace if worn out. Or call a glass shop that sells Anderson products and have them send out a rep to fix your problem.

 

I am about to install a 9' tall stained glass window inside an Anderson thermopane window. I do not plan to caulk it, in order to allow any potential condensation to vent. I have worked in several stained glass studios and this is standard practice. However, someone has just told me that there is a concern about heat buildup between the stained glass window and the thermopane that might hurt the thermopane seal. Should I be concerned about this? I have read the previous comments about placing storm windows on the exterior of a thermopane, but would the same apply with an interior window?

If it is a potential problem, can you give specific technical information about what temperature and conditions would threaten a thermopane seal? The window is southwest facing. The room inside is generally air conditioned. What precautions might I take to prevent breaking the seal?

Many thanks.