AC and Heating Repair for Fremont Homes
OzoneFlow Heating & Cooling repairs air conditioners and heating systems, and installs new AC, for homeowners in Fremont, Newark, Union City, Milpitas, Sunnyvale, Palo Alto, and nearby cities.
About us
A Fremont HVAC Company That Explains Before It Fixes
OzoneFlow Heating & Cooling is an HVAC repair company based in Fremont. We work on central air conditioners, furnaces, and heat pumps in homes around the southern end of the Bay and across the South Bay. Our approach is simple: find out what is actually wrong, explain it in plain terms, and let you decide what happens next. Sometimes that means a small part and a cleaning. Sometimes it means talking through whether an older system is worth fixing. When replacement makes sense, we install new AC systems sized for your home instead of copying the old unit's size. You get straight answers and an estimate in writing before any work begins.
More about how we work- We diagnose the problem before recommending any repair.
- We explain what we found in plain language.
- You get an estimate in writing before work begins.
Services
What we fix and install
We focus on three things: getting a broken air conditioner running again, fixing furnaces and heat pumps that won't heat, and installing new AC systems when repair no longer makes sense. Each job starts with finding the actual cause.
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AC Repair
If your AC is blowing warm air, running constantly, short-cycling, leaking, or making new noises, it likely needs a repair visit. We find the cause, explain your options in plain terms, and… -
Heating Repair
If your heating system is blowing cool air, cycling oddly, making new noises, or not turning on, a repair visit can usually find the cause and fix it the same day when… -
AC Installation
You likely need a new AC if your system is aging, needs frequent or major repairs, or can no longer keep your home comfortable. We inspect your home, ductwork, and electrical setup,…
What to expect
How a visit goes
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Find the cause first
We test and inspect before recommending a repair, so you aren't paying to swap parts that were never the problem.
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Explain your options
We tell you what we found, what fixing it involves, and when replacement is worth considering. Then the decision is yours.
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Size new systems properly
For AC installation, we look at your home, not just the old unit's label, so the new system fits the space it has to cool.
Service areas
Where we work
We're based in Fremont and also serve homeowners in Newark, Union City, Milpitas, Pleasanton, Santa Clara, Sunnyvale, Mountain View, Cupertino, Los Altos, Palo Alto, Menlo Park, and East Palo Alto. If you're nearby and not sure whether we cover your street, just ask.
- Milpitas
- Newark
- Santa Clara
- Sunnyvale
- Union City
- Mountain View
- East Palo Alto
- Menlo Park
- Los Altos
- Cupertino
- Pleasanton
- Palo Alto
Request service
Tell us what’s going on
Share a few details and we’ll call you to confirm the visit. Prefer to talk? (561) 920-2109
My AC is running but not cooling. Should I keep it on?
Turn it off at the thermostat if the air is warm or you see ice on the lines or outdoor unit. Running it that way can make the problem worse. Check that the filter isn't clogged and that the breaker hasn't tripped, then call us to diagnose it.
Do I really need air conditioning around here?
It depends on where you live. The Santa Clara Valley has dry summers and mild winters, but inland and southern parts of the valley run noticeably hotter in summer than areas near the Bay. Many homeowners in hotter pockets find AC worth having, and we can talk through what makes sense for your home.
Do I have to replace my gas furnace because of the new Bay Area rules?
No. The Bay Area Air District appliance rules don't require replacing working equipment. They apply only when an existing furnace or water heater fails or is replaced. If your furnace works, you can keep using and repairing it.
What changes for furnaces in 2029?
Under the Air District's rule, natural gas furnaces manufactured from 2029 must meet a zero-NOx emission standard. In practice, that points homeowners toward heat pumps when a furnace is replaced after that date. It's worth keeping in mind if your furnace is getting older.
Can I still get the federal tax credit for a heat pump?
No. The federal Energy Efficient Home Improvement Credit (25C) covered qualifying heat pumps placed in service before December 31, 2025. It isn't available for new installations after that date.
Are there any local incentives for heat pumps?
Bay Area homeowners can check BayREN and their local clean energy provider for current heat pump and electrification incentives. Amounts and availability change with each funding cycle, so we confirm the current offer before including it in any quote.
Need Your AC or Heat Looked At?
Tell us what your system is doing and when it started. We'll set up a visit, find the cause, and explain your options before any work begins.