Indoor Air Quality Guide for Desert Homes

Rapid loading usually means the return side is pulling attic air through a leak, or the filter slot is letting air slip past the edges. A duct leakage test tells you which. Replacing the filter more often treats the symptom while the leak keeps feeding the house.

Rarely. Dry indoor air is the desert's default for most of the year. Whole-home humidifiers are sold for houses with hardwood floors or instruments that need stable moisture, which is a specific reason rather than a general one. Bring it up at the evaluation if you have that reason.

In a dry month a continuously running fan passes more air through the filter each day, at the cost of blower electricity. During monsoon it also re-evaporates moisture sitting on the cold coil and sends it back into the house. Auto is the better setting in July and August.

No. The lamp limits film on the surfaces it illuminates; it does not remove dust already packed into the fins, and its bulb has a replacement interval. An annual maintenance visit still needs to clean and inspect the coil.

Cleaning removes what is already inside the ducts. Sealing stops more from entering. If the return side leaks, cleaning alone becomes a repeat purchase, so we recommend testing for leakage before scheduling either.

Sometimes. A house that has been tightened with new windows, foam and weatherstripping may need controlled ventilation. Many older homes leak enough on their own that adding more outdoor air makes little difference. It is a measurement question, not a catalog question.

Ask for the number behind it: the static pressure reading, the leakage percentage, the coil condition. We quote flat-rate before work begins and we will say when the answer is a cheaper filter and nothing else. A recommendation that arrives without a measurement is a sales pitch.