WINDOW DESIGN & ARRANGEMENT
Daylight, views and heat, balanced elevation by elevation.
Windows are simultaneously the best and the worst part of a wall. They bring in daylight, views and winter sun, and they lose heat five to fifteen times faster than the insulated wall around them. That trade is not an argument for fewer windows — it's an argument for knowing what each one costs and putting it where it earns its keep. The tool below shows the cost side exactly.
A fifth of the wall
3/5 OF THE LOSS
Twenty per cent glazing, triple-pane, on an R-30 wall: the glass is 20% of the area and 60% of the heat going through it.
The best window made
ABOUT R-7
A very good triple-pane unit is R-5 to R-7 whole-window. The wall it sits in is R-30 or better. There is no closing that gap.
Insulate the wall more
GLASS MATTERS MORE
Improving the opaque wall raises the glazing's share of the loss, not lowers it. You cannot insulate your way past a window.
Why this gets decided early
Window openings are structural, and glazing specs have lead times. Both are settled long before anyone picks a color.
AN OPENING IS A HEADER
There's no furnace to write off, no stranded equipment. Every mechanical choice here is a first choice.
GOOD WINDOWS ARE ORDERED EARLY
Triple-glazed units in specific sizes are made to order, not pulled off a shelf. The spec has to be settled early enough that a delivery date doesn't decide it for you — which is how projects end up with whatever was available.
THE GLAZING SIZES THE EQUIPMENT
Glazing area and orientation are among the largest single inputs to the heat loss calculation. Change them late and the heat pump, the ductwork and sometimes the service size all move with them.
Frequently Asked Questions
We want a wall of glass facing the water.
Then have it — but price it honestly. Put that elevation into the tool above and you'll see what it does to the effective R of the whole wall. Our advice in that case is always the same: spend the money on the best glazing available rather than on more of it, and size the heating to what you actually built.
A view is a legitimate reason to lose heat
Isn't triple glazing overkill?
In most of the country, arguably. Minnesota is one of the few US climates where it pencils on the heating bill alone, and the comfort difference is the part people actually notice — no cold draft falling off the glass, and no condensation on a January morning. Switch the spec in the tool and watch what happens to the second bar.
U 0.28 to U 0.20 is roughly a third off the glazing loss
Can't we add insulation to make up for it?
No, and the tool shows why better than an argument can. Hold the glazing and run the wall from R-12 to R-40: the total loss drops, but the fraction leaving through the windows goes up every step. Past a point, another inch of exterior foam buys less than a better window does.
Improving the wall raises the glass's share every time
What the package covers
WE SET
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A glazing area target per elevation, not one number for the building
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U-factor and SHGC per elevation, written into the schedule
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Head heights coordinated with the overhang geometry
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Operable units placed for the ventilation path, not symmetry
WE CHECK
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Whole-window NFRC values, never centre-of-glass numbers
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Frame material at the edge, where most windows actually fail
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Condensation resistance at a Minnesota indoor humidity
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Egress, fall protection and tempering before the order goes in
WE WON'T
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Quote centre-of-glass R-values, which flatter every window
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Use one glazing spec on all four elevations
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Add glass for elevation symmetry alone
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Let a lead time pick the window spec