Indoor air quality work in Menlo Park starts with a plain question: what is actually wrong with the air in this house? Dust, stale air, odors and dryness have different causes, and a product picked before anyone measures often treats the wrong one. A useful visit records what was checked, what can be fixed in the existing system, and when a filtration or ventilation change is the more realistic step. The general indoor air quality page describes each option in full; this one is about Menlo Park homes.
Start with measurements
An air quality visit measures, in several rooms and with the system both off and running:
- particles, including fine particles, to see whether the system lowers them or stirs them up;
- humidity and temperature, room by room;
- carbon dioxide, a practical sign of how well a closed-up house is ventilated;
- the system itself: filter fit and bypass, return leaks, the duct runs we can reach, and the indoor coil and drain pan.
You get the readings, not only a recommendation.
What we find in Menlo Park homes
Older homes with tired ducts. Many houses here are more than 50 years old, with original ductwork in the attic or under the floor. A return duct that has pulled loose draws air from the attic or crawlspace straight into the system, and the dust settles on furniture a day after cleaning. Sealing that leak often does more than any filter. Duct repair covers the fix, and our post on signs your ductwork needs attention lists what to look for.
Filters that air goes around. A filter of the wrong size, or a slot with gaps at the edges, lets dust bypass it entirely. It is common where a newer filter was fitted into an old furnace cabinet.
Pollen and summer dust. Mature street trees and dry summers bring a lot of pollen and fine dust indoors in spring and summer. Better filtration at the system, sized so the blower can still move enough air, is the usual answer.
Tightly sealed rebuilds. A well-sealed new house holds heat and cool air, and it also holds cooking fumes, moisture and carbon dioxide unless it has mechanical ventilation. Carbon dioxide that climbs in closed bedrooms overnight points to a ventilation question, not a filter question.
A musty smell when the AC starts. Usually a wet coil or a drain pan that holds water. Cleaning the coil and fixing the drain come before adding any equipment.
Options and when each one fits
| Option | What it does | When it fits | When it does not |
|---|---|---|---|
| Higher-efficiency filtration | Captures finer particles at the system | Dust and pollen, once bypass is fixed | Blower and ducts cannot handle the added resistance |
| UV light at the coil | Limits growth on the wet coil and drain pan | Recurring buildup on the coil or pan | Dust problems: UV does not filter anything |
| Whole-home humidifier | Adds moisture to heated air | Readings stay low all winter | Most homes with mild winters |
| ERV or HRV | Swaps stale indoor air for filtered outdoor air while recovering heat | Tight newer homes, high carbon dioxide | Leaky older homes that already exchange plenty of air |
| Duct sealing or cleaning | Stops attic dust getting in; removes buildup | Loose returns, debris inside the ducts | Ducts that are already clean and tight |
Duct cleaning is worth it in some houses and not in others, and the readings help decide.
Smoky or dusty days
When outdoor air turns smoky or dusty, close windows and doors, run the system fan with the highest-rated filter your blower can handle, and change that filter sooner than usual afterwards. A system with a fresh-air intake or an ERV may need its outdoor air turned down for those days; ask us how yours is set up.
What it costs
Most indoor air quality work in Menlo Park falls between $200 and $2,000. Fixing a filter slot or sealing a leaky return sits at the low end; adding ventilation with new duct connections sits at the top of the range or above it. What moves the price: the age and condition of the system, access to the equipment, the scope of labor, and whether duct, electrical or control changes are needed.
Before you approve
Ask for a written scope that ties each item to a reading and keeps the fix apart from optional upgrades. It should also list the running costs: replacement filters, UV lamps and any yearly service. If one visit cannot resolve everything, the next steps belong in writing as well.