Marvin Ultimate vs Pella Architect windows
We are building a new house in a cold winters (8,500′ elevation, climate zone 6B). It is designed to be energy efficient (e.g., thick exterior insulation on walls and roof). For windows, we are looking at quotes from Marvin and Pella. The prices are comparable (Marvin 10% or so higher). U factors are also similar (around 0.21 for tripane). I have a few questions have not been able to get clear answers on:
* Air leakage: Marvin says their casement windows have less than 0.01 cfm/ft2 air leakage for their casement windows in the Ultimate series. I could not find data on Pella Architect. Does anyone have experience?
* Overall quality: Pella seems to have had problems with quality in the past. For example, there was a class action lawsuit because of water penetration into the window sash, behind the aluminum cladding. This is a number of years ago. Is quality still a concern with Pella, even for their higher-end lines.
* Fiberglass vs aluminum: Marvin offers exterior fiberglass cladding or aluminum cladding. The thermal performance of fiberglass is better of course, and it is less expensive. What about durability? (Marvin’s warranty for aluminum-clad windows is 20 years vs 10 years for fiberglass clad windows.)
I’d appreciate any help people can provide here.
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