The single most useful thing to understand about heating and cooling in the central San Joaquin Valley, and the reason this company services things the way it does.
Take one model of air conditioner. Install one in a coastal town where it runs on perhaps a few dozen warm afternoons a year, and the other here, where the cooling season is long and genuinely hot and the system carries the whole of it. Five years later both units are five years old. Only one of them has done five years of work.
That is the whole argument, and almost everything on this page follows from it. Compressors, motors, capacitors, contactors, belts, bearings and coils do not wear out on a calendar. They wear out by running. A valley system runs more, against higher outdoor temperatures, which means higher head pressure, higher current draw and higher internal temperatures throughout — so each of those hours is a harder hour, too.
None of this is exotic. Any technician who has worked both climates knows it. It rarely gets said out loud to customers, though, because the honest version of it sounds like bad news: your equipment will not last as long here, and it needs more attention than the manual assumes.
Most maintenance schedules are written for an average climate across a large country. Applied here they under-service the equipment that works hardest. The interval should come from the duty, not from the brochure.
Any number you read about how long a system lasts is an average across every climate it was sold into. It is not a prediction about your unit in this valley. We would rather talk about the condition of the machine in front of us.
A marginal component survives a mild climate for years and a valley summer for one season. That is why we quote the part we would fit rather than the cheapest one that technically matches, and say plainly when we are doing it.
A slightly dirty coil, a slightly low charge and a slightly restrictive filter are each survivable alone. Together, under a genuine heat load, they are how a healthy system turns into a failed compressor.
On commercial sites, the service budget is often carried over from a portfolio elsewhere. It holds for two or three mild years and then produces a very expensive summer.
Almost every failure we attend in August was visible in April as a reading drifting in the wrong direction. That is the entire reason we write the readings down.
Dust. An air conditioner works by throwing heat off a coil into outdoor air. Cover that coil with agricultural dust, cottonwood fibre and road grit and it cannot do it, so head pressure climbs, current draw climbs, and the system runs hotter and longer for less cooling. It is not broken — it is smothered. Coil condition is the first thing we look at on a valley cooling call, and it is the most common single cause of "it runs all day and the house never gets cold".
Fog. Valley winters bring long, cold, damp, still spells. Heat pumps spend more time in defrost, condensate does not evaporate the way it does elsewhere, and the moisture sits. Meanwhile the still air that makes the fog is the same still air that lets combustion products linger, which is exactly when a marginal flue becomes a real problem.
Neither of these is in a manufacturer's service schedule. Both of them are in ours.
Nothing here requires you to buy anything. Most of it is about attention and timing.
On a commercial site the runtime argument turns into a budgeting argument, and that is where it does the most good.
No run-hour figures, no degree-day totals, no "systems here last X years", no percentage by which maintenance extends equipment life, and no comparison table of one climate against another. We could publish numbers like that and they would make this page more persuasive. They would also be estimates presented as measurements, and the moment someone repeats one back to us as a promise, we would deserve it.
What we will do is measure your system, show you the readings, and compare them with the readings from your last visit. That is a real number about a real machine, and it is worth more than a statistic about the valley.
It is an argument for the right interval, which for some units is less than they are currently getting. A blanket schedule across a site over-services the quiet units, and we will say so and take those off the frequent list. If everything we recommended happened to cost more, you would be right to be sceptical.
No — it makes it an individual case, which is the point. Duty, shade, coil condition, airflow, installation quality and luck all matter. That is exactly why we would rather look at your machine than tell you what the average machine does.
Not automatically. Replacing a healthy system early wastes money. What is worth doing is knowing the condition well enough to decide deliberately, in spring, rather than in a heatwave with one option and no time.
Less, because the heating season here is short and mild by comparison. But the long still fog spells matter for combustion and venting, and heat pumps that carry both seasons accumulate hours all year rather than for one of them.
House or building. We measure, we write it down, and you keep the readings whether or not you do anything with them.