Phoenix HVAC systems run nine to ten months per year under sustained heat loads that most equipment is never designed to sustain. The national average HVAC lifespan is 15 to 20 years. In the Phoenix metro, expect 12 to 15 years under normal use. A 13-year-old system on a West Valley home is not “a few years from replacement” — it is statistically at or past end of design life. It may run fine through October and fail in June when surface temps hit 110 and the unit runs 18 hours a day.

What to look for: the manufacture date is on the data plate, typically on the side of the outdoor condenser unit. A date code of 2012 or earlier on any unit requires an HVAC-specific inspection beyond what a general home inspector provides. Get a licensed HVAC contractor to evaluate refrigerant levels, capacitor condition, heat exchanger integrity, and remaining compressor life.

This was covered in detail in Blog 53. The short version: the tiles on Phoenix homes built 2003–2010 look intact. The underlayment beneath them — the actual waterproofing layer — has a 15 to 20 year design life under Arizona heat conditions. Surface temperatures exceed 160 degrees Fahrenheit. UV radiation is relentless. A general home inspector typically does not lift tiles to assess underlayment. A clean SPDS does not mean the underlayment is serviceable.

Any Phoenix home built before 2012 with a tile roof requires a dedicated roofing inspection by a licensed Arizona contractor who physically accesses the roof deck and samples the underlayment condition. The inspection costs $150 to $400. Ignoring this on a $480,000 purchase is a material due diligence failure.

Phoenix homes built before 2000 frequently used copper plumbing that runs beneath the concrete slab. Arizona’s soil chemistry — high mineral content, variable pH — corrodes copper from the outside. The wet-dry soil movement from monsoon cycles stresses underground joint connections. The result is a slab leak: a pinhole or joint failure in the supply or drain lines running under the foundation.

Signs: unexplained spikes in water bills, warm spots on tile floors, the sound of running water when all fixtures are off, water staining on lower wall sections near the slab perimeter, or prior insurance claims for water damage. The SPDS specifically asks about slab leaks and prior repairs — a “yes” answer requires follow-up, not just acknowledgment. A prior repair does not mean the problem is resolved. It means one point was addressed while the rest of the copper plumbing remains at the same age and soil exposure.

A converted garage, enclosed patio, finished casita, or room addition that was built without a City of Phoenix permit creates several interlocking problems for the buyer who inherits it. First, the structure was never inspected — no one verified framing, electrical, plumbing, insulation, or egress compliance. Second, the current homeowner is fully liable for code violations discovered after purchase, even if they did not perform the work. Third, lenders frequently decline to finance homes with significant unpermitted square footage. Fourth, the unpermitted space cannot legally be included in the home’s appraised square footage, which inflates the effective price per square foot of the permitted space.

The permit history for any Phoenix property is publicly accessible through the City of Phoenix Development Services Department online portal. Pull it during the inspection period. Compare the permitted square footage and structure description against what you are physically walking through. If the property shows a finished room that does not appear in the permit record, the work was either unpermitted or the record is incomplete — both require resolution before closing.

Arizona has multiple termite species, including subterranean termites — among the most destructive in North America — that remain active year-round due to the warm climate. Phoenix-area homes are at elevated risk compared to most of the country. Lenders require a wood-destroying insect (WDI) inspection for FHA and VA loans; it is strongly recommended for all West Valley buyers regardless of loan type. Cost: $50 to $150 for a licensed pest control professional’s written report.

What to look for during your own walkthrough: mud tubes along the foundation, stem walls, or framing (thin tubes of packed mud termites build for moisture as they travel); hollow-sounding wood when tapped near baseboards or door frames; small piles of frass near wall penetrations; and prior treatment disclosures on the SPDS. The SPDS specifically requires sellers to disclose any evidence of termites or wood-destroying organisms, prior treatments, and clearance letters.

Under the Arizona Residential Resale Purchase Contract, buyers receive HOA governing documents after contract acceptance and have five days to review and, if necessary, disapprove of the transaction. Most buyers skim the CC&Rs and sign. What they should actually be examining: the most recent financial statements, the reserve fund balance and reserve study, meeting minutes from the past 12 to 24 months, and any pending litigation disclosures.

The specific risks in the West Valley: HOAs managing pools, desert landscaping, and common area amenities in extreme heat environments carry significantly higher maintenance costs than HOAs in temperate climates. A reserve fund that looks adequate on paper for a Minnesota HOA may be dramatically underfunded for the same community in Peoria or Goodyear where pool equipment, asphalt surfaces, and HVAC for common facilities all operate under extreme conditions year-round.

Phoenix’s monsoon season delivers sudden, heavy rainfall that the surrounding desert cannot absorb quickly. Properties with inadequate drainage — flat lots without positive grade away from the foundation, homes adjacent to natural washes, or communities with undersized drainage infrastructure — are vulnerable to water intrusion events that do not occur incrementally. They occur once, badly, and leave evidence that sellers are required to disclose but may have addressed cosmetically.

What to look for: staining at the base of interior walls particularly in garage areas, closets, and lower courses of drywall; efflorescence (white mineral deposits) on masonry block walls indicating repeated moisture wicking; patched or replaced drywall sections at lower wall heights; and grading that slopes toward the foundation rather than away from it. The SPDS specifically asks sellers to disclose any history of flooding, pooling, or drainage problems on the property, particularly near washes or on lower lots.

Fresh paint, new LVP flooring, updated kitchen hardware, and a pressure-washed driveway are not renovation. They are presentation. In the current Phoenix market — where sellers are competing for buyers who have 24,358 active listings to choose from — cosmetic refreshes before listing are standard practice. The question is what is underneath them.

Specific signs that cosmetics are covering systemic neglect: new paint applied over water stain patterns rather than over stain-blocking primer on a dry, repaired substrate (look for slight discoloration or texture differences on repainted ceilings); fresh caulk around tub and shower surrounds on tile that has significant grout deterioration behind it; new flooring installed over a slab with surface cracking; and a home with recent cosmetic updates whose HVAC data plate shows a 2009 manufacture date and whose water heater label reads 2010.

In the January 2026 Phoenix market, average DOM is 94 days and 98% of homes close within 2% of list price. A home that has been on the market for 130 days with two price reductions totaling $35,000, then relisted after a brief withdrawal, is not a normal inventory situation. That pattern — extended DOM, material price reductions, relisting — almost always indicates one of three things: original overpricing, a prior contract that fell through due to inspection findings, or a condition issue the seller has not yet disclosed or resolved.

Your agent can pull the full MLS history on any property, including prior listing periods, price change history, and any recorded status changes. A property that went pending and then back to active during a prior listing cycle failed to close for a reason. Ask for the prior inspection report if one was generated — sellers are not required to provide it, but the request is informative regardless of the response.

The SPDS is a 10-page document. Sellers who complete it thoroughly — providing specific dates, contractor names, repair documentation, and warranty information — are demonstrating both compliance with Arizona disclosure law and confidence in the property’s condition. Sellers who respond “unknown” to questions about HVAC age, roof condition, slab leak history, and prior water damage on a home they have owned for eight years are not being transparent. “Unknown” on a fact the seller should know is a disclosure pattern that warrants heightened scrutiny during the inspection period.

Arizona disclosure law requires sellers to disclose known material facts. It does not permit deliberately avoiding knowledge of a problem to escape disclosure — this is defined under Arizona law as willful blindness and creates civil liability. A buyer who identifies a material condition problem after closing that the seller “did not know about” despite obvious indicators has grounds for a nondisclosure claim.