HVAC findings appear in the vast majority of Phoenix resale inspections — and the desert accelerates wear dramatically. The average Phoenix HVAC system runs 2,000 to 2,500 hours per year versus 750 to 1,000 hours in moderate climates. A system that is 8 years old in Phoenix has often worked the equivalent of a 12 to 15-year-old system in the Midwest.

Common HVAC findings in Phoenix: dirty or clogged air handlers, improper temperature differential between supply and return air (should be 16 to 22 degrees Fahrenheit at the unit — inspectors will test this), refrigerant level indicators, capacitor wear, condensate drain pan condition and drainage, and supply/return duct condition at the air handler. Inspectors will note the manufacture date on the data plate — most list the expected service life as 10 to 15 years, but Phoenix conditions place the realistic expectation at the lower end of that range.

Phoenix is a tile-roof city. Concrete and clay tile roofs dominate the residential landscape, and while the tile itself can last 40 to 50 years, the underlayment beneath the tile is the actual waterproofing layer — and it typically lasts 15 to 25 years in the Phoenix climate before UV degradation and thermal cycling break it down. The tile sits on top looking intact while the underlayment beneath has reached the end of its service life.

Common findings: cracked or displaced tiles (often from foot traffic during prior maintenance work), deteriorated or missing mortar at ridges and hips, flashings at penetrations showing wear or improper installation, and — the significant one — underlayment age indicators. If a home was built in 1995 to 2005 and the roof has never been re-papered, the underlayment is approaching or past its service life regardless of how the tile looks from the street.

Electrical findings are nearly universal in Phoenix resale inspections and span a wide severity range. The most frequently flagged are not panel-level failures (those appear in Blog 21 of this series) but the more common safety deficiencies that appear throughout the home.

Missing GFCI protection is the most common electrical finding in Phoenix. Ground Fault Circuit Interrupter protection is required at wet locations — bathrooms, kitchens within 6 feet of a sink, garages, exterior outlets, laundry areas — but code requirements apply at the time of original construction. Older homes may have no GFCI in bathrooms built to 1970s or 1980s code. AFCI (Arc Fault Circuit Interrupter) breakers, now required in newer construction bedroom circuits, are frequently absent in homes built before the early 2000s code adoptions. Double-tapped breakers (two wires connected to a single breaker terminal not designed for it) and open junction boxes (exposed wiring in boxes without covers) also appear regularly.

Water heater findings appear in a high percentage of Phoenix inspections — not because Phoenix homes have particularly bad water heaters, but because Phoenix’s water hardness accelerates the useful life calculation. Phoenix municipal water is among the hardest in the country, with high calcium and magnesium content that creates sediment buildup inside tank units. The national average service life for a tank water heater is 10 to 15 years; the realistic expectation in Phoenix is 8 to 12 years due to the mineral load on the tank, the heating element, and the anode rod.

Beyond age, inspectors flag three specific installation issues consistently: the Temperature Pressure Relief (TPR) valve discharge pipe must be properly routed to within 6 inches of the floor or to the exterior — missing, improperly terminated, or upward-routed TPR pipes are a safety deficiency. Inadequate clearance around the unit (gas water heaters require combustion air clearance) and corrosion at connections are also common findings.

Plumbing findings in Phoenix fall into two categories that need to be clearly distinguished: the everyday findings that appear in virtually every resale inspection, and the serious slab-leak indicators that require immediate specialist evaluation (covered separately in Blog 21 of this series).

The everyday findings: dripping faucets and running toilets (cosmetic but wasteful), flexible supply lines under sinks and at toilets that are beyond their recommended replacement window (braided stainless lines are standard; older corrugated supply lines are failure-prone), water pressure that falls outside the 40 to 80 PSI recommended range (both high and low pressure are flagged — high pressure can accelerate wear on fixtures and supply lines throughout the home), and slow drains indicating partial clogs in branch drain lines. These are common findings that inspectors document as maintenance items. The supply line and water pressure observations are the ones most worth acting on.

Drainage findings are among the most counterintuitive in Phoenix — in a desert averaging 8 inches of annual rainfall, buyers often dismiss grading issues as irrelevant. They are not. Phoenix monsoon season (June 15 through September 30) delivers intense precipitation in short windows — a single storm can drop 1 to 2 inches of rain in under an hour. Improper grading that directs water toward the foundation perimeter can move significant moisture against a slab or stem wall in the time it takes for a haboob to pass through.

Common drainage findings: negative grading at the foundation perimeter (soil, decomposed granite, or landscaping pitched toward the house instead of away from it at a minimum 6-inch drop over the first 10 feet), downspout termination within 3 feet of the foundation, and pool deck drainage directing water toward the structure. In homes with raised foundations or CMU block construction, evidence of water intrusion in garages or utility areas adjacent to the foundation is a more serious indicator.

Window and door findings are the highest-frequency low-severity category in Phoenix inspection reports. They appear in virtually every resale home and account for a meaningful portion of the page count — but the majority are maintenance observations that should not consume BINSR negotiating capital.

Failed window seals (the thermal pane develops a foggy or hazy appearance between the glass layers when the inert gas fills have leaked) are extremely common in Phoenix, where the thermal differential between a sun-baked exterior glass surface and interior-cooled air creates repeated expansion and contraction stress on the seal. Failed seals are a cosmetic issue — the window continues to function, but insulating efficiency is reduced. Individual insulated glass unit (IGU) replacement runs $200 to $400 per window. Inoperable hardware (door locks that do not engage cleanly, window latches that do not fully close), weatherstripping wear, and door sweep gaps are also standard findings — all correctable for under $50 per location in most cases.

Arizona has more than 18 termite species — significantly more than most of the country — and the desert climate does not protect against them. Subterranean termites, the most common type in the Phoenix metro, build mud tubes from the soil to the wood they are consuming and can establish significant infestations in garage framing, fascia boards, door frames, and wooden components adjacent to the foundation without being visible from the interior.

The WDIIR (Wood Destroying Insect Inspection Report) is a separate inspection from the standard home inspection, performed by a licensed pest control operator. It is not legally required by Arizona for all transactions, but it is required by most lenders for FHA and VA loans, and it should be ordered for every Phoenix resale purchase regardless of loan type. The WDIIR distinguishes between active infestation, prior treatment, prior activity with no current evidence, and structural damage requiring evaluation. Active infestation is treatable — structural damage from a long-term infestation requires a structural engineer evaluation and is a different conversation.

Phoenix attics reach 150 to 160 degrees Fahrenheit in summer. Insulation is not optional — it is the primary defense against that heat entering the conditioned living space and overworking the HVAC system. Arizona Energy Code recommends R-38 minimum insulation in Phoenix attics; the current International Energy Code calls for R-49 in the climate zone. Older homes with R-19 or R-22 insulation are operating at a meaningful efficiency deficit that shows up in electricity bills every month from May through September.

Inspectors will estimate the insulation R-value by measuring depth in the attic. Common findings: settled blown-in insulation that has compressed below its rated R-value over time, batt insulation gaps or voids where sections have shifted or been disturbed by prior roof work, and — the finding with the most direct HVAC impact — disconnected or poorly sealed duct runs in the attic. A duct that has separated at a joint is pumping conditioned air into a 150-degree attic rather than into the living space, which simultaneously reduces comfort and dramatically increases HVAC operating costs and wear.

Smoke and carbon monoxide detector findings appear in the vast majority of Phoenix inspection reports — and they generate disproportionate buyer confusion because they are flagged as safety issues while typically being inexpensive to correct. The combination of a “safety” label and a long report creates the impression that the home has a serious problem; in most cases, it means the existing detectors are expired, improperly placed, or the home lacks CO detectors entirely.

Arizona requires smoke detectors in all sleeping rooms, outside each sleeping area, and on each level of a home. Carbon monoxide detectors are required in homes with attached garages or gas appliances. Inspectors frequently flag: detectors past their 10-year rated service life (manufacture date is printed on the back), missing CO detectors in homes with gas appliances or attached garages, and improperly placed detectors (too close to kitchen exhaust, in dead air spaces, or in locations where false alarms would prevent effective warning). This is the finding that generates the most first-time buyer alarm per dollar of actual correction cost.