In San Antonio, commercial air conditioning isn't a luxury — it's essential. With summer temperatures regularly climbing past 100°F, a failed HVAC system can shut down a restaurant, empty a retail store, or make an office unworkable within hours.
Many refrigeration companies in our directory also service commercial HVAC, because the underlying technology — compressors, refrigerant, and heat exchange — is closely related. Here's what business owners should know about keeping their cooling systems running.
Warning Signs Your Commercial HVAC Needs Attention
- •Weak or warm airflow from the vents, especially during the hottest part of the day
- •Uneven cooling — some rooms comfortable, others hot
- •Rising energy bills with no change in usage
- •Strange noises like grinding, squealing, or banging from rooftop units
- •Short cycling — the system turns on and off rapidly without properly cooling
- •Water leaks or ice on the indoor unit or around the air handler
Catching these early is the difference between a small repair and a full system-down emergency in the middle of July.
Why Rooftop Units Fail in San Antonio
Most commercial buildings use rooftop package units (RTUs). In our climate, they face specific challenges:
- •Extreme heat load: Running near capacity for months stresses compressors and capacitors.
- •Dust and debris: San Antonio's dust and pollen clog condenser coils, forcing the system to work harder.
- •Sun exposure: Constant UV degrades electrical components and refrigerant lines faster than in milder climates.
- •Hard water and humidity swings: These contribute to coil corrosion and drainage problems.
The Most Common Commercial HVAC Repairs
Refrigerant Leaks
Low refrigerant means weak cooling and an overworked compressor. A technician finds and seals the leak, then recharges the system to spec — rather than just topping it off.
Capacitor and Contactor Failures
These small electrical components fail often in the heat and are among the most common (and affordable) HVAC repairs. A failed capacitor is a frequent cause of a unit that hums but won't start.
Compressor Problems
The compressor is the heart of the system. A failing compressor is a major repair, and a technician will help you weigh repair against replacement based on the unit's age.
Clogged Condensate Drains
In humid weather, drain lines clog and cause water damage or trigger safety shutoffs. Clearing them is routine but important.
Preventive Maintenance Pays Off
The single best way to avoid a summer HVAC emergency is a spring maintenance visit: coil cleaning, refrigerant check, electrical inspection, and drain clearing. It costs a fraction of an emergency repair and extends the life of the equipment.
Need commercial HVAC or refrigeration repair in San Antonio? Browse our directory to find contractors who service both, many with 24/7 emergency response.
Frequently Asked Questions
How often should commercial HVAC be serviced?
At least twice a year — once in spring before the cooling season and once in fall. In San Antonio's heat, a spring tune-up is especially important.
Why does my commercial AC freeze up?
Ice on the unit usually means low refrigerant or restricted airflow (dirty filters or coils). Turn the system off to let it thaw and call a technician — running it frozen can damage the compressor.
How long do commercial rooftop units last?
Most commercial RTUs last 15-20 years with proper maintenance. In San Antonio's harsh climate, neglected units often fail sooner.
Is it cheaper to repair or replace a commercial AC unit?
For units under 12-15 years old, repair is usually the better value. For older units with major compressor failure, replacement often makes more financial sense due to efficiency gains.