Licensed C-20 Indoor Air Quality
Indoor Air Quality Solutions in Los Angeles & Orange County
Between wildfire smoke seasons, freeway corridors, and year-round allergens, Southern California air works hard against your home. The air inside can be worse than the air outside — recirculating dust, smoke particles, pet dander, and pollen through your HVAC system all day.
- 25 Years in Business
- 24/7 Emergency Service
- CA C-20 License #1094200
- Parts & Labor Guarantee
- Lifetime Guarantee
- Discounts Available
Why United Heating & Air Conditioning for indoor air quality
United Heating & Air Conditioning designs and installs indoor air quality solutions that work with your existing system: high-efficiency filtration, air purification, duct sealing and repair, and ventilation improvements — sized and installed correctly by a licensed C-20 contractor.
Whole-home filtration
High-MERV media filters and filtration upgrades that capture smoke particles, dust, and allergens — without choking your system's airflow.
Air purification
Purification systems installed in your ductwork treat the air your whole home breathes, not just one room.
Duct sealing & repair
Leaky ducts pull dusty attic and crawlspace air into your home and waste the air you've paid to condition. Sealing them improves both air quality and efficiency.
Wildfire smoke readiness
The right filtration setup makes a measurable difference during SoCal smoke events — we'll configure your system to protect your indoor air when it matters most.
Licensed & Accountable
A state-licensed contractor that stands behind the work
United Heating & Air Conditioning holds the CA State Warm-Air HVAC License C-20 #1094200 — the California license classification specifically for warm-air heating, ventilation, and air conditioning. 25 years in business, every job covered by our parts & labor guarantee, and our installations backed by a lifetime guarantee.
- 25 years serving LA & Orange County
- 24/7 emergency availability
- Parts & labor guarantee
- Lifetime guarantee on our installations
Related services
Where we provide indoor air quality
Indoor Air Quality is available across both counties — every city, every neighborhood, 24/7 for emergencies.
Popular service areas
Indoor Air Quality — common questions
What's the best air filter upgrade for wildfire smoke?
For most homes, a properly sized high-MERV media filter cabinet is the biggest single improvement — it captures fine smoke particles without starving the system of airflow. We'll assess your system and recommend what actually fits it.
Do air purifiers really work?
Quality in-duct purification and filtration systems measurably reduce particulates, allergens, and odors. The key is correct sizing and installation — a unit that doesn't match your system's airflow won't deliver. That's the part we get right.
How do I know if my ducts are leaking?
Common signs: rooms that never condition properly, dust blowing from vents, high bills, and visibly damaged ducts in the attic. We inspect and test ductwork and show you exactly what we find.
Can you improve air quality without replacing my HVAC system?
Usually, yes. Most filtration, purification, and duct-sealing upgrades integrate with your existing system. We'll tell you plainly if your equipment can't support an upgrade.
Do you serve both LA and Orange County for air quality work?
Yes — we design and install indoor air quality solutions across all of Los Angeles County and Orange County.
Need indoor air quality? Let's handle it.
Call (818) 817-6005 for 24/7 service across Los Angeles County and Orange County, or send the form and we'll call you back.
Call (818) 817-6005CA C-20 License #1094200 · 25years in business · Parts & labor guarantee
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