When homeowners invest thousands of dollars in a new air conditioner, heat pump, or furnace, it’s easy to assume that brand-new equipment will work perfectly right out of the box.
After all, it’s new. What could possibly be wrong?
The reality is that even the best HVAC manufacturers occasionally have equipment issues. While defects are relatively uncommon, they do happen. That’s why a professional HVAC installation isn’t complete when the equipment is physically installed. It’s complete when the equipment has been fully tested, commissioned, and verified to be operating correctly.
Recently, our team discovered a refrigerant leak in a brand-new outdoor condenser during installation. The unit had never been operated before and was fresh out of the box. Fortunately, proper testing procedures identified the issue before the system was turned over to the homeowner.
While nobody wants to find a leak in new equipment, discovering it during installation is far better than finding out on the first 95-degree day of summer.
New Equipment Goes Through a Long Journey
Most homeowners don’t realize how much handling HVAC equipment experiences before it arrives at their home.
A typical air conditioning condenser may:
- Be manufactured hundreds or thousands of miles away
- Be loaded onto trucks multiple times
- Travel through distribution centers and warehouses
- Be unloaded and reloaded by equipment handlers
- Sit in storage for weeks or months
- Be delivered to a contractor and transported to the job site
Throughout that process, equipment can experience vibration, impacts, weather exposure, and handling damage.
Manufacturers do an excellent job packaging and protecting equipment, but no system is immune to the realities of transportation and logistics.
The Most Common Leaks Found During HVAC Installations
Although leaks in new equipment are not an everyday occurrence, there are several areas where issues are most commonly discovered.
1. Factory Coil Leaks
Both indoor evaporator coils and outdoor condenser coils are manufactured using numerous copper or aluminum connections.
Occasionally, a tiny defect in a brazed joint or tubing connection can create a refrigerant leak that wasn’t detected before the equipment left the factory.
These leaks may be extremely small but can still lead to performance issues and eventual system failure if not identified.
2. Shipping or Handling Damage
HVAC equipment is heavy and often moved multiple times before installation.
Even a relatively minor impact can damage coil tubing or create stress points that eventually develop into leaks.
This is one reason professional installers carefully inspect equipment before installation begins.
3. Service Valve and Schrader Core Leaks
Outdoor condensers contain service valves and access ports that technicians use for startup and servicing.
Occasionally, these components can leak refrigerant due to damaged seals, loose cores, or manufacturing defects.
While these repairs are often straightforward, they still need to be identified before the system is placed into operation.
4. Field Connection Leaks
During installation, technicians connect refrigerant piping to the new equipment.
Improper brazing procedures, contamination, or installation mistakes can create leaks at these connection points.
This is why experienced installers pressure test every refrigerant circuit before startup.
How Professional HVAC Installers Test New Equipment
A quality installation involves much more than mounting equipment and turning it on.
Several critical steps are performed to ensure the system operates properly.
Pressure Testing
The refrigerant system is pressurized using dry nitrogen to verify that no leaks are present.
This allows technicians to identify potential issues before refrigerant is introduced into the system.
Leak Detection
Electronic leak detectors and other testing methods are used to inspect the equipment and piping connections.
These tools can detect extremely small leaks that may not be visible to the naked eye.
Deep Vacuum Procedure
Once the system passes pressure testing, technicians pull a deep vacuum to remove moisture, air, and contaminants from the refrigerant circuit.
Moisture left inside an HVAC system can significantly reduce equipment life and performance.
System Charging
The refrigerant charge is carefully verified according to manufacturer specifications.
An improper refrigerant charge can negatively impact efficiency, comfort, and system longevity.
Performance Verification
The final step involves confirming that the system operates exactly as designed.
Technicians verify:
- Refrigerant pressures
- Superheat and subcooling
- Temperature split
- Airflow
- Electrical performance
- Thermostat operation
- Safety controls
Only after all these checks are completed should a system be considered ready for normal operation.
Why Thorough Testing Protects Homeowners
Finding a leak during installation may seem like bad news, but it’s actually evidence that the contractor is doing their job correctly.
The real concern is when equipment isn’t properly tested and issues aren’t discovered until weeks or months later.
Proper commissioning helps:
- Prevent premature system failures
- Improve reliability
- Protect manufacturer warranties
- Maximize efficiency
- Improve comfort
- Reduce future service calls
Most importantly, it gives homeowners confidence that their investment is operating correctly from day one.
The Difference Between Installation and Commissioning
Many people think HVAC installation ends when the equipment is physically connected.
In reality, installation is only part of the process.
Commissioning—the testing, verification, adjustment, and performance validation of the equipment—is what transforms a collection of components into a properly operating comfort system.
A new HVAC system represents a significant investment. Taking the extra time to test every component, verify every connection, and confirm proper operation helps ensure that investment provides years of reliable comfort.
When a contractor finds an issue before they leave your driveway, that’s not a sign of a problem. It’s a sign they were thorough enough to look for one.
