Why is my AC running but blowing warm air?

Common causes include a dirty filter, a failed capacitor, a condenser fan that stopped working, a frozen coil, or low refrigerant from a leak. A technician needs to test the system to find which one it is.

Should I keep running my AC if it's freezing up?

No. Turn the cooling off and let the ice melt, leaving the fan on if possible. Running a frozen system can damage the compressor. Check the filter, and call for service if the ice comes back.

Can you just add refrigerant to fix my AC?

Air conditioners don't use up refrigerant, so low refrigerant means there's a leak. Adding more without finding the leak is a short-term fix. We'll explain your options for locating and repairing it.

Is there a federal tax credit for a new heat pump?

The federal Energy Efficient Home Improvement Credit only covered qualifying heat pumps placed in service before December 31, 2025, so it doesn't apply to new installations. Check BayREN and your local clean energy provider for current incentives.

AC Repair | SwiftAir

Q: Do you repair heat pumps and ductless systems?

Yes. We repair central air conditioners, heat pumps, and ductless mini-split systems for homeowners in San Jose and nearby cities.

Q: Will I have to replace my gas furnace because of new Air District rules?

No. The Bay Area Air District rules don't require replacing working equipment. They apply only when an existing furnace fails or is replaced, and the zero-NOx standard covers gas furnaces manufactured from 2029.

The short answer

If your AC is blowing warm air, running constantly, making new noises, leaking, or tripping breakers, it likely needs a repair visit. We diagnose the actual cause, explain your repair and replacement options in plain terms, and give you the cost before any work starts.

When your air conditioner quits on a hot afternoon, you want a clear answer about what's wrong and what it will take to fix it. SwiftAir Conditioning Repair diagnoses and repairs central air conditioners, heat pumps, and ductless mini-split systems for homeowners in San Jose and nearby cities. The Santa Clara Valley has dry summers, and inland and southern parts of the valley run noticeably hotter than areas near the Bay. That means a system that struggles in early summer often fails outright during a later heat wave. This page covers the warning signs to watch for, what our technicians check, how we think about repairing versus replacing, what drives the cost of a repair, and what happens during a visit.

Signs Your Air Conditioner Needs Repair

Most AC problems start small. Catching them early usually means a simpler repair and less chance of a complete breakdown on the hottest day of the year. Call for service if you notice any of the following:

Air from the vents feels warm or only slightly cool
The system runs almost nonstop but the house never reaches the thermostat setting
The outdoor unit hums but the fan doesn't spin, or it won't start at all
Short cycling, where the system turns on and off every few minutes
Grinding, squealing, banging, rattling, or loud buzzing sounds
Ice on the refrigerant lines or the indoor coil
Water pooling near the indoor unit or furnace cabinet
A burning or musty smell when the system starts
The breaker trips when the AC kicks on
Some rooms stay much warmer than others when they didn't before
Your electric bill climbs without a change in how you use the system

What We Check During a Repair Visit

A good repair starts with finding the real cause, not just the symptom. A frozen coil, for example, can come from a clogged filter, a failing blower motor, or low refrigerant, and each needs a different fix. Our technicians work through the system step by step:

Thermostat settings, wiring, and power to the indoor and outdoor units
Breakers, disconnect, and electrical connections for loose or burned wires
Capacitors and contactors, which are common failure points on hot days
Compressor and condenser fan motor operation
Refrigerant pressures and signs of a leak
Condenser coil condition, including dirt, debris, and bent fins
Evaporator coil, air filter, and blower motor
Condensate drain line, pan, and safety float switch
Airflow at the supply and return vents, plus visible ductwork issues
Temperature difference between the air going in and coming out

Repair or Replace: How to Decide

Most service calls end with a repair. A failed capacitor, a clogged drain line, or a worn contactor can often be fixed in one visit, and the system goes back to running normally. When a repair makes sense, we'll tell you so.

Replacement is worth considering when the compressor has failed on an older system, when there's a major refrigerant leak in the coil, when repairs are becoming frequent, or when the system simply can't keep the house comfortable anymore. We'll walk you through the age and condition of your equipment, what the repair involves, and what a replacement would look like, then let you decide. We won't push a new system on you.

If you do replace, it's worth thinking about heat and cooling together. A heat pump handles both. Under Bay Area Air District rules, natural gas furnaces manufactured from 2029 must meet a zero-NOx emission standard, which in practice points homeowners toward heat pumps when a furnace is replaced after that date. Those rules don't require you to replace working equipment; they apply only when an existing furnace fails or is replaced.

On incentives: the federal Energy Efficient Home Improvement Credit only covered qualifying heat pumps placed in service before December 31, 2025, so it isn't available for new installations. Bay Area homeowners can check BayREN and their local clean energy provider for current heat pump and electrification incentives. Since amounts and availability change by funding cycle, we confirm the current offer before including it in a quote.

What Affects the Cost of AC Repair

Every repair is different, and we give you the cost before we start any work. These are the main factors that affect it:

The part that failed: a capacitor or contactor is a much smaller job than a compressor or coil
Refrigerant type and amount, especially on older systems that use phased-out refrigerants
Whether a leak has to be located and sealed before refrigerant is added
Labor time and how easy the equipment is to reach, such as a unit in a tight attic or crawlspace
Part availability for your brand and model
Whether the repair is a single fix or several related problems found together
Timing, such as service needed outside regular hours

How an AC Repair Visit Works

When you contact us, we'll ask what you're noticing, the type of system you have, and when it started acting up. That helps the technician arrive prepared and carry the parts most likely to be needed.

On site, the technician listens to your description, inspects the system, and runs the diagnostic checks above. Then they explain what they found in plain language, show you the problem when possible, and give you your options and the cost for each. Nothing is repaired until you approve it.

After the repair, the technician tests the system through a full cooling cycle, checks temperatures and airflow, and makes sure everything is running properly. Before leaving, they'll let you know about anything else they noticed, such as a filter due for replacement or a drain line that needs regular attention, so you can plan ahead.

AC Repair in San Jose and Nearby Cities

Signs Your Air Conditioner Needs Repair

What We Check During a Repair Visit

Repair or Replace: How to Decide

What Affects the Cost of AC Repair

How an AC Repair Visit Works

AC Repair by city

How a visit goes

Clear answers before work begins

Repair first when it's reasonable

Equipment that fits your home

Common questions

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