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Modest cooling loads, heavy dust loads, and colder nights than people expect. That combination is what makes this valley its own job.
The part of your system the valley is hardest on
A condenser coil works by moving a great deal of air through very fine fins. Fine soil is exactly the wrong thing to put into that, and it does not wash off the way people assume — a rinse from the outside face cleans the side you can see and packs the rest deeper in.
The symptoms are quiet. Longer run times, higher pressures, a system that used to keep up and now does not quite, and eventually a compressor working harder than it was designed to for years. Nothing fails; it just gets worse.
Cleaning it properly — from the inside face out, with the fan section opened — is an unglamorous hour that is worth more in this town than most of the things sold instead of it.
Six things
No cooling, no heat
Checked in order of cost. Capacitors, contactors, float switches, filters, thermostats and breakers before anything expensive is on the table.
Coil cleaning
Done properly, with the fan section opened, rather than rinsed from outside. In this valley it is frequently the whole answer.
The filter path
Not the grade — the path. A cabinet that does not seal, or a return drawing outside air through a gap, means most of the air goes around whatever you fitted.
Duct testing
Leakage and static pressure measured. A leaking return here is a permanent open window on the field side of the house.
Gas heat
Combustion tested and recorded, heat exchanger inspected, flue checked as installed. The clear nights get genuinely cold.
Replacement
Sized from the house rather than from the old rating plate, which in this climate usually means smaller than people expect.
Worth hearing before you spend
Oversizing is the local error
Cool damp air and moderate peaks mean a system that satisfies the thermostat in eight minutes never runs long enough to remove moisture. The house ends up cool and heavy. The right answer here is usually smaller than the one being quoted.
Maintenance beats equipment
In a dusty valley with modest loads, the difference between a system that performs and one that does not is almost always the state of the coil and the filter path rather than the efficiency rating on the box.
Check the filter on your own schedule
Not the one on the packet. A filter rated for three months in a suburb can be substantially blocked here in six weeks during a working season, and a blocked filter starves a system exactly as effectively as one that is too fine for it.
Where we stop
We do not make health claims, we do not assess exposure, and we will not tell you what is in the air outside your house. If somebody at home is affected by something, that is a conversation for their doctor. If the question is about an application on a field near you, it goes to the County Agricultural Commissioner, who is the person with the authority and the records.
What we will do is measure your system, seal the filter path, clean the coil properly and tell you in writing what we found — which is a useful thing to have in either of those conversations.