What HVAC services does Baseline Home provide in Los Angeles?

Baseline provides HVAC maintenance and air quality optimization for residential homes in the Woodland Hills and Conejo Valley area. This includes filter fit evaluation, coil condition assessment, duct leakage checks, airflow distribution analysis, and ventilation rate measurement — all through the lens of what the air data shows.

How does HVAC maintenance affect indoor air quality?

Your HVAC system is your home's primary air processing system. When maintenance slips, filtration degrades, coil buildup changes run times and humidity, and duct leakage increases. A poorly maintained system can score 15 to 20 points lower on the Baseline Score compared to the same home with a well-maintained system.

What is the most common HVAC problem you find in LA homes?

Filter bypass. In roughly half the homes we assess, there are gaps around the HVAC filter frame that allow unfiltered air to bypass the filter media entirely. The filter may be the correct rating, properly installed, and recently changed — but gaps in the housing make it far less effective than its rating suggests.

How is Baseline different from a regular HVAC contractor?

Baseline doesn't sell HVAC equipment. We measure what the air is doing and recommend changes in order of impact. If a $20 filter frame seal fixes your biggest air quality issue, that's the recommendation. Our approach starts with data, not equipment replacement.

How often should I service my HVAC system in Los Angeles?

Twice yearly is the standard recommendation, but in Southern California the math is different. Year-round AC use means more runtime, faster filter loading, and additional particulate load from wildfire seasons. Most LA homes benefit from filter checks every 60 to 90 days during peak cooling months and filter replacement after significant smoke events.

Should I replace or optimize my existing HVAC system?

That depends on what the data shows, not the age of the equipment. A system in good mechanical condition with fixable air quality issues — filter bypass, duct leakage, ventilation shortfall — should be optimized first. Equipment replacement makes sense when there's a refrigerant phase-out issue, a failing compressor on an aging system, or a fundamental capacity mismatch that optimization can't address.

Residential HVAC Services in Los Angeles Homes

Your HVAC system is the most important piece of air quality equipment in your home. Not the most expensive. Not the most complicated. The most important. Every hour it runs, it moves the entire volume of air in your house through a filter, across a coil, and out through ducts. What it captures, what it misses, and where it leaks determines most of what you breathe.

Most HVAC service treats the system as a comfort machine. Is it cooling? Is it heating? Good, we are done. That misses the point.

HVAC as Air Processing

A residential HVAC system does four things simultaneously: it conditions air (heating or cooling), it filters air (through the return filter), it distributes air (through the duct system), and it exchanges air (if there is a fresh-air intake, which most LA homes do not have).

The conditioning piece gets all the attention. The filtering, distributing, and exchanging pieces determine your air quality.

A system that cools the house to 72 degrees but has filter bypass, leaky ducts, and no fresh-air pathway is keeping you comfortable while recirculating contaminated air. The thermostat is satisfied. The air is not good.

This is why Baseline approaches HVAC service through the lens of what the air data shows, not just whether the system is running.

What We See in Los Angeles Homes

The western San Fernando Valley and Conejo Valley have a specific housing stock. Roughly speaking, we see three eras.

1960s to 1980s ranch and tract homes. Original or once-replaced HVAC systems. Attic-mounted air handlers with flex duct. Loose building envelopes. These homes ventilate naturally through their leakiness, which helps CO2 and VOC levels but hurts energy efficiency and PM2.5 control during wildfire events.

1990s to 2010s construction. Tighter envelopes, better insulation, often two-zone systems. These homes are more energy efficient but prone to ventilation shortfalls. CO2 above 1,000 ppm is common in sealed bedrooms.

Recent builds and major renovations. Very tight envelopes, Title 24 compliance, sometimes mechanical ventilation. The systems are newer but the design does not always account for real-world occupancy patterns.

Across all three eras, the most common issue we find is the same: filter fit problems. The filter is present. The rating is adequate. The frame has gaps. Air bypasses the media. Roughly half the homes we assess have this issue regardless of the system's age or quality.

Maintenance That Moves the Numbers

Typical HVAC maintenance checks refrigerant levels, cleans the condenser, tests capacitors, and verifies thermostat operation. These are necessary. They are not sufficient for air quality.

Here is what we add.

Filter fit evaluation. Not just "is there a filter" but "is air passing through it or around it." We look at the filter housing, measure gaps, and determine if the current configuration can actually capture what it is rated for.

Coil condition assessment. A dirty evaporator coil extends run times, which over-dehumidifies in LA's already dry climate. It also serves as a growth medium if condensation is not draining properly.

Duct leakage check. Industry estimates put residential duct leakage at 20 to 30%. That means up to a third of your conditioned, filtered air goes into the attic. And the system pulls replacement air from unconditioned, unfiltered spaces. Duct sealing has one of the highest returns of any HVAC improvement for both comfort and air quality.

Airflow distribution. Room-by-room temperature variation is a symptom. We identify which zones are under-served and whether the issue is duct sizing, register placement, or return air path.

Ventilation rate. We estimate how much fresh outdoor air is entering the home per hour. If the home is under-ventilated — as most tight-envelope homes in LA are — we discuss options ranging from simple fan scheduling adjustments to mechanical fresh-air intakes.

The Baseline Approach

A typical HVAC contractor has an incentive to sell equipment. A system that is not broken but is 12 years old is, to many contractors, a replacement candidate. That may be the right call in some cases. In many cases, the existing equipment is fine and the issues are configuration, filtration, and maintenance.

Baseline does not sell HVAC equipment. We measure what the air is doing and recommend changes in order of impact. If a $3 filter frame seal fixes your biggest air quality issue, that is the recommendation. If the system genuinely needs replacement or significant upgrade, the data will show that too.

The assessment costs $195 and takes about 90 minutes. You get data, a score, and a prioritized list. Our free IAQ guide covers the basics of how HVAC connects to the air quality numbers.