NJ winters are hard on commercial cooling equipment. Condensers sit idle for four to five months. Refrigerant line insulation takes a beating. And the first 90-degree day of the year, someone flips the system on without a second thought. That’s when the problems show up. Better to catch them in April than at 4pm on a Friday in June when your building is 85 degrees and the phones are ringing.
This is what a proper commercial cooling startup looks like, and why facility managers across Morris, Bergen, Passaic, Essex, and Union Counties should have one scheduled before Memorial Day.
Walk the Roof Before You Touch the Thermostat
Physical inspection comes first. Before any system is powered up, get eyes on your rooftop units. You’re looking for debris packed into condenser coils from winter storms, damaged or bent fan blades, loose access panels, refrigerant line insulation that’s cracked or missing, and signs of animal activity. Squirrels and birds nesting inside rooftop units is not rare. It happens every spring. A nest in the wrong place blocks airflow or damages wiring.
Write down what you find. Note the unit number, the condition, and anything that needs follow-up. A quick visual pass takes 20 minutes and catches problems before they become expensive.
Clean the Condenser Coils
Dirty condenser coils are the single biggest factor in cooling efficiency. When coils are clogged with cottonwood, dust, and debris, the compressor has to work harder to reject heat. That shortens equipment life and spikes your electric bill. On a hot August day, a unit with dirty coils may not even reach setpoint.
Cleaning requires the right chemicals. Alkaline coil cleaners work well on heavily fouled aluminum fins, but they need to be applied correctly and rinsed thoroughly. Using the wrong product or leaving residue behind causes corrosion. A technician who cleans coils all day knows what to use and how to rinse without damaging fins. This is one of the reasons a professional startup is worth the cost.
Check the Refrigerant Charge
Most commercial systems that struggled last summer were running low on refrigerant, and nobody caught it early. Here’s the thing: refrigerant does not get consumed. A system that’s low on charge has a leak somewhere.
Checking pressures is a basic startup task. If suction and discharge pressures are off from the manufacturer’s specification, that points to an undercharge or an overcharge, both of which cause problems. If the system is low, the leak needs to be located and repaired before refrigerant is added. Just topping off is not a fix. And refrigerant handling requires EPA 608 certification, so your maintenance staff cannot legally perform this part of the startup without it.
Inspect Electrical Connections and Test Capacitors
Contactors pit after years of cycling. Wire connections loosen over a season of thermal expansion and contraction. Terminals corrode. Any of these conditions can cause nuisance trips, reduced motor life, or outright failures.
Capacitors are worth special attention. A capacitor test takes about two minutes with a multimeter. A bad capacitor is a $20 to $50 part. A failed capacitor in July means the compressor or condenser fan motor won’t start, which means an emergency service call on a weekend in peak season. Catching it in April is a much better outcome. Check contactors visually for pitting and burning, measure incoming voltage, and verify motor amp draws against nameplate ratings.
Test Economizer Operation
If your rooftop units are equipped with economizers, test them before cooling season. An economizer that’s stuck closed means you’re running mechanical cooling when free outside air would handle the load. That’s wasted money every time the outside air temperature drops below your changeover setpoint.
Stuck economizers are a common finding during spring startup on Trane, Carrier, and York RTUs across the region. The controls get sticky, linkages corrode, or the actuator fails over winter. A quick functional test tells you whether the damper is modulating correctly. If it’s not, the fix is usually straightforward. A working economizer can cut your energy management costs during shoulder season by a real margin. Don’t leave it on the table.
Update BAS Schedules and Setpoints
Your building automation system is still running winter setpoints. Cooling season occupied and unoccupied temperatures, setback schedules, and optimal start and stop times all need to be updated before the first hot week.
Run a test over a weekend before you need the system in earnest. Verify that occupied mode triggers correctly, that setbacks activate after hours, and that the system actually calls for cooling when it should. A test run in late April catches schedule conflicts or control issues before they affect anyone in the building. If you have Daikin or Lennox split systems with older controls, confirm that cooling mode is not locked out from winter and that your controller is reading space temperature accurately.
Change Filters Before Startup
Dirty filters in cooling season cause low airflow across the evaporator coil. Low airflow means the coil runs colder than it should, the coil freezes, and no air comes out of the supply registers. You get comfort complaints and a service call.
Change filters now, before startup. Log the replacement date. If your building uses MERV-13 filters, check static pressure drop across the filter bank. Higher-efficiency filters restrict airflow more than standard filters, and older fan systems may need a different strategy. This is worth a conversation with your HVAC contractor if you haven’t had it already.
Why Facility Maintenance Crews Can Only Do Part of This
Your in-house maintenance team can handle the visual inspection, change filters, and log equipment issues. That’s valuable work. But a full commercial AC spring maintenance visit also requires refrigerant pressure checks (EPA 608 certification required), coil cleaning with appropriate chemicals, capacitor testing, electrical measurements, and economizer functional tests that most facility staff aren’t equipped to do safely or accurately.
A professional startup on a rooftop unit runs $200 to $400 per unit depending on size and condition. That cost is small compared to an emergency repair in the middle of summer, an early compressor failure, or an electric bill that runs high all season because the coils were never cleaned.
Good preventative maintenance is about catching the $50 problem before it becomes the $5,000 problem. Spring startup is the clearest example of that in commercial HVAC services.
Schedule Your Spring Startup with KCG
KCG Air runs commercial HVAC summer prep and cooling system startups for facilities across Morris, Bergen, Passaic, Essex, Hudson, Union, Middlesex, and Monmouth Counties. Whether you have two rooftop units or twenty, we go through a consistent startup checklist on every unit and give you a written report of what we found.
April and early May slots fill up. If you want to get ahead of the heat, call us or reach out through KCG Energy Management. And if you’re planning ahead for next fall, our guide on fall HVAC prep covers the other side of the seasonal cycle.