Air conditioning in Phoenix is not an amenity — it is infrastructure. An AC unit that fails in July with temperatures above 115°F is a health emergency, not an inconvenience. Phoenix AC units run approximately 3,000 hours per year, roughly double the national average, which compresses their practical lifespan accordingly.

A system over 12 years old is operating near or past its practical lifespan in this climate. An inspector who reports a 14-year-old unit “functional at time of inspection” is not saying it will survive another Phoenix summer. That distinction matters.

What to look for beyond age: The refrigerant type matters as much as the unit age. Systems using R-22 refrigerant — phased out of production in 2020 — compound the problem significantly. R-22 is no longer manufactured, making it scarce and expensive to charge. An aging R-22 unit with any refrigerant leak is effectively at end-of-life; repair costs approach replacement costs quickly.

The inspection should note the SEER rating. Systems below SEER 14 (the current federal minimum for new installations in Arizona) represent both an efficiency gap and an age indicator. Also confirm the number of units: homes over 2,500 square feet in the Phoenix metro often run two separate systems, and a split-level or multi-story home with one aging unit serving the whole structure is an undersizing problem on top of an age problem.

Tile roofs dominate the Phoenix metro and create a counterintuitive inspection problem: the tiles are not the roof. The waterproof barrier is the underlayment beneath the tiles. Tiles look intact from the ground — and the underlayment directly beneath them can be degraded to the point of failure after 15 to 20 years of Arizona UV exposure and daily thermal cycling (40–50°F swings every day, year-round).

Foam (spray polyurethane) roofs — common on flat or low-slope homes throughout the West and Northwest Valley — require recoating every 5 to 10 years. A foam roof with visible alligatoring (the cracking, scaly texture that looks like alligator skin) or exposed gray/brown substrate rather than intact elastomeric coating is past due for maintenance and actively allowing UV degradation of the foam layer. An overdue foam roof is a near-term mandatory cost item.

The Phoenix monsoon season (June through September) creates a concentrated test of roof integrity every year. Haboobs blow dust and debris into gaps; driving rain at wind speeds exceeding 60 mph exploits any compromised flashing at walls, chimney transitions, skylight penetrations, and HVAC curbs. These transition points are where leaks most commonly originate — not at the field of the roof.

Arizona is home to more than 18 species of termites. The warm, dry soil of the Phoenix metro is an ideal environment for subterranean termites — the most destructive species — which build vast underground colonies and enter structures through mud tubes constructed along foundations, in garages, and inside walls. Drywood termites infest wood framing from inside, often leaving no external evidence until damage is significant. Both species can be active in a home for years without visible signs.

A Wood Destroying Insect Inspection Report (WDIIR) is a separate inspection from the general home inspection and is not automatically included in a standard $400-$550 inspection. It is required by VA and FHA lenders and strongly recommended for all buyers regardless of loan type. The WDIIR costs $75 to $150, is valid for 30 days, and includes a property diagram identifying any evidence of current or prior wood-destroying insect activity.

Key distinction on the WDIIR: finding evidence of prior activity that has been treated and remediated is different from finding active infestation. Prior treatment with documentation is manageable and negotiable. Active infestation requires treatment before most lenders will fund, and structural damage from prior untreated infestations requires contractor assessment.

Stucco exteriors are nearly universal in the Phoenix metro. Thermal cycling — the same 40–50°F daily temperature swings that degrade roofs — causes stucco to expand and contract constantly. Hairline cracks under 1/8 inch are a normal characteristic of stucco in the desert and are generally cosmetic. What is not cosmetic: cracks wider than 1/4 inch, diagonal cracks radiating from window or door corners, cracks with efflorescence (white mineral deposits), or any staining that indicates water has been entering the wall cavity.

The Phoenix monsoon season delivers the concentrated annual water test. Intense storms with driving rain at 60+ mph can force water through stucco cracks that drained fine during the nine dry months preceding them. Buyers looking at homes that have been on the market since the previous monsoon season (June–September) should specifically examine south- and west-facing elevations, which take the most direct wind-driven rain exposure.

A fresh coat of paint over a limited wall section or a single interior wall — particularly in a bathroom, utility room, or on an exterior-facing interior wall — is worth asking about directly. It is a common masking technique for recent water damage or mold remediation. Sellers are required to disclose known water intrusion on the Arizona Seller’s Property Disclosure Statement (SPDS). If the SPDS indicates no prior water intrusion but the inspection report notes active staining or moisture readings, those two data points are in conflict and the discrepancy needs resolution before close.

Phoenix’s rapid postwar residential growth produced a large housing stock built between the 1950s and 1990s — a period when electrical panels now known to have serious safety deficiencies were widely installed. Two brands stand out as the most significant: Federal Pacific Electric (FPE) Stab-Lok panels and Zinsco panels.

Both FPE Stab-Lok and Zinsco panels have documented failure modes where breakers do not trip under overcurrent conditions — the fundamental safety function a breaker is designed to perform. The result is elevated fire risk. These panels are not automatically illegal (they were code-compliant when installed) but are flagged as safety concerns by virtually every home inspector and insurance underwriter. Many homeowner’s insurance carriers will not write a policy on a home with these panels without panel replacement.

Beyond panel brand, the inspector’s report may flag double-tapped breakers — two circuit wires on a single breaker terminal, a code violation and fire hazard in most configurations — and reversed polarity at outlets, where the hot and neutral wires are connected backwards. Reversed polarity is common in older Phoenix homes with original wiring and is correctable but requires addressing systematically rather than outlet-by-outlet if it appears frequently in the report.

For homes built before 1978: the inspection report should address whether aluminum branch circuit wiring is present. Aluminum wiring in branch circuits (not the same as aluminum service entrance cable, which is standard and safe) requires specific devices and techniques to connect safely to modern outlets and fixtures. If present, an electrician familiar with aluminum wiring remediation should be consulted during the inspection period.