Window replacement in Tempe, AZ: the oldest big housing stock in the East Valley

If your Tempe house is from that era, the windows in it are very likely single-pane or early double-pane glass in an aluminum frame, and the question is not whether they are behind current standards. It is which of them are actually failing.

The build era, and the one number that complicates it

Source: U.S. Census Bureau, American Community Survey 2020–2024, tables B25034 and B25035. Year built is occupant-reported and should be read at decade resolution — it describes the city well and your individual parcel only approximately.

Read the last row, because it is the most important thing on this page and most local marketing will never mention it.

At 42.3% owner-occupied, Tempe has the lowest homeowner share of any Valley city we have measured — a long way below Mesa's 64.4% or Chandler's 65.0%. A very large share of Tempe's housing is rented, and a renter reading this page cannot authorise the work.

We are telling you that because it cuts against us, and because it changes what is true for you. If you own your Tempe home, you are in a smaller group than the housing numbers suggest — and you are also in a group whose houses are, on average, the oldest large cohort in the East Valley. Those two facts are both real and we are not going to multiply them together into a tidier statistic, because that arithmetic would be ours rather than the Census Bureau's.

What 1970s and 1980s construction means for your windows

This is the era of aluminum framing as the Valley default, and federal guidance on it is blunt: "metal or aluminum window frames conduct heat very rapidly, which makes metal a very poor insulating material", and such frames "should have a thermal break — an insulating plastic strip placed between the inside and outside of the frame and sash." A great many Valley windows of this era do not have one.

To be fair to the material, the same federal page calls metal frames "very strong, light, and almost maintenance free" — and that is why a fifty-year-old Tempe aluminum frame is very often still square and still operating. If someone tells you your aluminum frames are "shot," go and look at them, because they very often are not. The problem is thermal, not structural.

You can check for a thermal break yourself in about two minutes, and it is the single most useful thing to do before taking an appointment: metal window frames in Arizona.

Our intake data says this is the dominant pattern here. Across 472 Phoenix-area homeowners who told us what their frames are made of, about 60% — 281 — have metal, 161 of those are twenty-plus years old, 75 are still the windows the builder installed, and 83 reported fogging between the panes.

If your glass is a single pane

On a house from 1975, it often is. A single-pane window has no insulating layer at all — a sheet of glass with outside on one side and your living room on the other. The second pane in a modern unit is mostly there to hold an insulating gas in place; federal guidance describes the cavity as "usually about 1/2", filled with argon or krypton gas."

But in this climate the bigger gain is the coating, not the pane count — which is the opposite of what almost everything written about this subject assumes, because almost all of it was written for heating climates. The full argument: single pane vs double pane in Arizona.

If your glass is an early double pane

Then the spacer is the thing on a clock. Peer-reviewed testing found edge sealants show six to eight times more permeability at 60 °C than at 20 °C, that "sunlight is regarded as the most important aging factor on IGUs," and that over seventy weeks aluminum spacers leaked more gas than non-metallic warm-edge spacers. Gas loss raises a unit's U-factor by up to 32%.

That failure shows up as permanent haze between the panes, and it cannot be repaired: why windows fog between the panes.

The roof on a 1980s house

If the original roof is still on, it is well past the point where the question is worth asking — and on a tile roof, the tile is almost certainly fine while the underlayment beneath it is the actual question.

Nobody can tell you when yours is due, because no manufacturer publishes a service life for roofing underlayment at all. We checked five. What they publish is a maximum 180-day exposure window during installation, routinely misquoted as a lifespan. The full finding: how long tile roof underlayment actually lasts.

Phoenix is a tile market — tile outnumbers shingle roughly 6.4 to 1 in the Mesa permit record, the only hard published evidence we could find — and the two systems fail differently, with only one offering a mid-life lift-and-relay: tile vs shingle in the Phoenix climate.

On permits, we are not going to guess. We have verified and published the reroofing permit position for Phoenix, unincorporated Maricopa County, Mesa, Gilbert, Chandler, Surprise and Scottsdale. We have not verified one for the City of Tempe, so we are not stating one. Ask the city, ask your bidder who is pulling it, and get the answer in writing.

How to date your own windows and roof

Windows. On a double-pane unit, check the bottom corner of the glass for an etched date on the spacer. On a single pane there is usually nothing to find, which is itself informative. A manufacturer label on the sash edge or jamb gives you the product line — on a 1970s or 1980s frame there frequently is none, and that generally means glass-only replacement will be a custom order rather than an off-the-shelf match.

Roof. From the ground, look along the eaves and rake edges for exposed felt that is curling, brittle or torn. Check the fascia for dark streaks. Inside, a stain that only shows after a long rain and dries invisible is the classic underlayment signature.

What to ask anyone bidding the work

1. Which elevations are you finding failures on, and did you actually walk them?
2. Is the frame thermally broken? On a Tempe house of this era this is the first question, not the fifth. If it is bare aluminum, new glass in the old frame is treating the symptom.
3. Glass-only or full window, and why for this specific opening?
4. U-factor and SHGC in writing. ENERGY STAR Version 7.0 sets the hotter-zone bar at U ≤ 0.32 / SHGC ≤ 0.23, and federal guidance says low SHGC is the priority in warm climates.
5. Spacer type — non-metallic warm edge, or metal?
6. Retrofit or full-frame, stated explicitly. On a stucco house this is one of the larger swings on your quote.
7. On the roof: lift-and-relay or tear-off, and the assumed tile breakage rate.
8. Whether a permit applies, and who pulls it.
9. License number, checked — glazing is R-65, roofing is R-42. What that number protects and what it does not. Ours is ROC 364596.

The full printable version is on what a window quote should include.

Window replacement costs in nearby cities

• Window replacement costs in Mesa
• Window replacement costs in Chandler
• Window replacement costs in Scottsdale
• Window replacement costs in Gilbert