The desert breaks houses in a specific order
A rental in Phoenix does not age the way a rental in Portland ages. Sustained heat, hard water, intense ultraviolet exposure, monsoon wind and rain, and expansive soils that move with moisture all attack different parts of the building, and they do it predictably.
Air conditioning carries a load here that it does not carry elsewhere and therefore wears out faster. Roof materials and exterior paint degrade under ultraviolet exposure. Hard water scales fixtures, water heaters and any appliance that heats water. Irrigation systems fail quietly and either kill the landscaping or run up a water bill nobody notices for a month. Weather seals and caulking dry, shrink and crack, which then lets conditioned air out and monsoon water in.
Because it is predictable, it is schedulable. That is the entire argument for preventive maintenance in this market: you are not guessing at what will fail, you are choosing whether to meet it on your calendar or on its own.
Air conditioning is the one that has to be serviced before the heat
Get the system serviced in spring. Not in June, when every competent HVAC company in the Valley is booked solid and you are joining a queue behind people whose systems have already failed. Spring service means the technician is available, the visit is cheap, and anything they find is a planned repair rather than an emergency callout on a Saturday in July.
Filters are the highest-return, lowest-cost item in the whole building. A clogged filter makes the system work harder, run longer, cost more and fail sooner. Make filter supply and replacement an explicit, documented part of the arrangement with the resident rather than an assumption — assumptions about filters are why compressors die early.
Know the age of the unit and plan for it. An air conditioner in this climate has a working life, and an owner who knows their system is near the end of it can budget for a planned replacement in a shoulder season. An owner who does not find out until the system dies in July pays a premium for emergency work, and has an uninhabitable house in the meantime.
The seasonal rhythm
Spring, before the heat. Service the air conditioning. Check and adjust the irrigation timer for the coming season and look for leaks and broken emitters. Inspect exterior paint and caulking. Check weather stripping and door seals.
Early summer, before monsoon. Clear roof drainage and scuppers. Check the roof for lifted or damaged material. Look at trees near the structure — monsoon winds bring down limbs onto roofs and vehicles, and a tree that needed attention in June becomes an insurance claim in August. Check that the site drains away from the foundation.
Autumn, after monsoon. Inspect for storm damage while it is still small. Look for water intrusion evidence at ceilings and around windows. Reset irrigation for cooler weather. Service heating before it is needed.
Winter, the planning window. This is when you do the interior work, the capital planning and the unglamorous items: water heater condition and age, plumbing and valve checks, appliance ages, smoke and carbon monoxide detectors, and anything with a pool. It is also the right time to walk the property with the owner and decide what gets replaced this year.
Inspect the property, and document what you saw
Periodic interior inspections — with proper notice to the resident, as the statute requires — catch three categories of problem while they are still cheap: slow leaks that have not yet reached the drywall, unauthorised occupants or pets, and residents who are quietly not reporting things because they do not want to be a nuisance. That last group is more common than owners expect and costs more than the other two combined.
Photograph everything, date it, and keep it. A dated photographic record is what turns a contested move-out into a straightforward one, and it is what lets an owner see the trajectory of their asset rather than a series of invoices.
Make reporting easy and respond fast. Every hour between a resident noticing a problem and you knowing about it is an hour of damage progressing, and a resident who has been ignored once will not call the second time.
Budget for replacement, not just repair
Repairs are what you spend to keep something working. Replacement reserves are what you set aside because the roof, the air conditioner, the water heater and the appliances all have finite lives and will end them on their own schedule. Owners who track only repairs experience every replacement as a crisis, and crises get financed badly.
Keep a simple list: each major component, its approximate age, its expected remaining life, and what it costs to replace today. Update it at the annual walkthrough. That one page changes an owner's relationship with their property more than any other document I hand out, because it converts a series of shocks into a plan.