Chiller and Cooling Tower Maintenance Tips for Apartment and Condo Owners

Chillers and Cooling Towers: What Landlords and Property Owners Need to Know to Keep Multifamily Properties Comfortable and Efficient

For landlords and property owners, maintaining a comfortable living environment is one of the most important responsibilities of owning apartments, condominiums, and townhome communities. While residents often focus on the thermostat inside their units, the systems working behind the scenes are far more complex. In many larger multifamily buildings, chillers and cooling towers serve as the backbone of the property's cooling infrastructure.

These systems are responsible for delivering reliable comfort during the hottest months of the year, but they also represent some of the most expensive mechanical assets in a building. When properly maintained, they can provide decades of dependable service. When neglected, however, they can lead to costly repairs, increased utility bills, tenant complaints, health concerns, and even premature replacement.

Understanding how chillers and cooling towers work, and what it takes to keep them operating efficiently, can help landlords and property owners protect their investments while keeping residents satisfied.

Understanding Chillers

A chiller is a machine that removes heat from water through a refrigeration cycle. The chilled water is then circulated throughout a building to fan coil units, air handlers, or other HVAC equipment that cool individual apartments and common areas.

Unlike conventional residential air conditioning systems where each apartment has its own outdoor condenser, centralized chilled water systems provide cooling for an entire building from one mechanical plant. Common types include:

• Air-cooled chillers

• Water-cooled chillers

• Absorption chillers (less common in residential buildings)

Many apartment towers, condominiums, mixed-use developments, and luxury residential communities utilize water-cooled chillers because of their exceptional efficiency, especially in larger buildings.

What Cooling Towers Do

Cooling towers work alongside water-cooled chillers.

After the chiller removes heat from the building, that heat must go somewhere. Cooling towers reject the unwanted heat into the atmosphere through evaporation. Think of the cooling tower as the system's "heat exhaust."

Without properly functioning cooling towers, chillers cannot efficiently reject heat, forcing compressors to work harder and consume significantly more electricity. Together, chillers and cooling towers create one of the most energy-efficient cooling solutions available for large residential properties.

Why Preventive Maintenance Is Essential

Chillers and cooling towers operate for hundreds or even thousands of hours every year.

Because these systems are under continuous demand throughout the cooling season, even minor maintenance issues can quickly become expensive problems. Routine maintenance helps:

• Reduce energy consumption

• Prevent unexpected breakdowns

• Extend equipment lifespan

• Improve resident comfort

• Lower repair costs

• Maintain manufacturer warranties

• Improve overall building value

  
  

Preventive maintenance costs are almost always lower than emergency repairs or equipment replacement.

Rising Energy Costs Make Efficiency More Important Than Ever

Electricity costs continue to rise in many regions. An inefficient chiller can consume thousands of dollars in unnecessary electricity every cooling season. Common efficiency losses come from:

• Dirty condenser tubes

• Fouled evaporators

• Improper refrigerant charge

• Poor water treatment

• Scaled cooling towers

• Worn pumps

• Failing motors

• Dirty strainers

  
  

Even relatively small efficiency losses can have a significant impact because chillers often represent one of the largest electrical loads in a multifamily property.

Water Treatment Cannot Be Overlooked

One of the biggest differences between standard HVAC equipment and water-cooled systems is the importance of water quality. Cooling towers continuously circulate water that can develop:

• Scale

• Corrosion

• Biological growth

• Sediment buildup

• Mineral deposits

  
  

Without proper chemical treatment, these issues reduce efficiency and shorten equipment life. Professional water treatment programs typically include:

• Chemical balancing

• Corrosion inhibitors

• Scale prevention

• Biological control

• Regular water testing

• Blowdown management

  
  

Skipping water treatment is one of the fastest ways to damage expensive cooling equipment.

Legionella Prevention Matters

Cooling towers require special attention because warm water can become an environment where bacteria, including Legionella, may grow if systems are not properly maintained. Property owners should ensure:

• Routine inspections

• Water quality monitoring

• Cleaning schedules

• Proper disinfection

• Documentation of maintenance

• Compliance with local regulations

Many jurisdictions have specific requirements regarding cooling tower maintenance, testing, and reporting. Protecting resident health should always be a top priority.

Seasonal Startup and Shutdown Procedures

One common mistake is assuming chillers can simply be switched on when temperatures rise. Seasonal startup should include:

• Electrical inspections

• Refrigerant pressure checks

• Oil analysis

• Pump inspections

• Water flow verification

• Control calibration

• Sensor testing

• Cooling tower inspection

• Cleaning of heat transfer surfaces

  
  

Likewise, proper winterization helps prevent freeze damage and corrosion during colder months.

Common Warning Signs of Trouble

Landlords and maintenance teams should never ignore early warning signs. These may include:

• Rising energy bills

• Longer cooling cycles

• Warm apartments

• Frequent tenant complaints

• Unusual noises

• Vibration

• Water leaks

• Frequent alarms

• Poor humidity control

• High condenser pressures

  
  

Addressing these symptoms early often prevents catastrophic failures later.

Cooling Tower Maintenance Priorities

Cooling towers operate outdoors and are exposed to weather, debris, pollen, dirt, and airborne contaminants. Routine maintenance should include:

• Cleaning fill media

• Inspecting drift eliminators

• Checking fan motors

• Inspecting belts

• Cleaning strainers

• Verifying water distribution

• Inspecting nozzles

• Lubricating bearings

• Inspecting structural components

• Checking basin cleanliness

  
  

Even small airflow restrictions can significantly reduce cooling performance.

Chiller Maintenance Priorities

Professional technicians typically inspect:

• Compressors

• Heat exchangers

• Refrigerant levels

• Condenser tubes

• Evaporator tubes

• Pumps

• Expansion valves

• Electrical components

• Variable frequency drives

• Sensors

• Control systems

• Safety devices

Many manufacturers recommend annual comprehensive inspections in addition to routine service visits throughout the cooling season.

Extending Equipment Life

Replacing a commercial chiller represents a major capital expense. Fortunately, well-maintained chillers frequently last:

• 20–30 years

• Sometimes even longer with excellent maintenance

Cooling towers can also provide decades of service when structural components are properly maintained and corrosion is minimized. The key is consistency. Deferred maintenance nearly always shortens equipment life.

Tenant Satisfaction Depends on Reliable Cooling

Residents expect comfortable indoor temperatures regardless of outdoor conditions.

When centralized cooling systems fail, multiple apartments may lose cooling simultaneously. This can quickly lead to:

• Increased maintenance calls

• Resident dissatisfaction

• Negative online reviews

• Lease non-renewals

• Emergency repair costs

  
  

Reliable HVAC operation is one of the strongest contributors to positive tenant experiences.

Modern Controls Improve Performance

Today's building automation systems provide landlords with valuable insight into equipment performance. Modern monitoring can track:

• Energy usage

• Water temperatures

• Pump performance

• Equipment run times

• Alarm history

• Refrigerant pressures

• Cooling loads

• System efficiency

  
  

Some systems even identify developing issues before occupants notice a problem.

Predictive maintenance helps reduce unexpected downtime while improving budgeting for future repairs.

Budgeting for Capital Improvements

No mechanical equipment lasts forever. Property owners should create long-term capital plans that account for eventual replacement of:

• Chillers

• Cooling towers

• Pumps

• Heat exchangers

• Variable frequency drives

• Controls

• Motors

  
  

Planning years in advance allows owners to avoid emergency replacement projects that often carry significantly higher costs. Capital planning also provides opportunities to upgrade to more energy-efficient equipment that can reduce operating expenses.

Sustainability and Energy Efficiency

Many multifamily owners are pursuing sustainability initiatives to reduce operating costs and meet environmental goals. Modern high-efficiency chillers can deliver:

• Lower electrical demand

• Reduced greenhouse gas emissions

• Improved reliability

• Better part-load efficiency

• Lower maintenance costs

  
  

Cooling tower improvements, upgraded controls, and optimized water treatment programs can further enhance system performance. These investments often produce measurable savings over the life of the equipment.

Documentation Is Important

Every property should maintain organized records for:

• Maintenance visits

• Water treatment reports

• Equipment inspections

• Repair history

• Refrigerant usage

• Warranty information

• Equipment manuals

• Startup reports

• Performance testing

  
  

Good documentation simplifies troubleshooting, supports warranty claims, and assists future budgeting decisions. It also demonstrates responsible property management.

The Value of Partnering with an Experienced HVAC/R Company

Chillers and cooling towers are sophisticated mechanical systems that require specialized expertise. Unlike standard residential HVAC equipment, these systems involve complex refrigeration circuits, water chemistry, controls, pumps, and large electrical components. Attempting to manage them without experienced professionals can lead to unnecessary downtime, higher operating costs, and expensive repairs.

Partnering with a trusted HVAC/R contractor gives landlords and property owners access to technicians trained to service, maintain, repair, and optimize these critical systems. A qualified partner can provide preventive maintenance programs, seasonal inspections, emergency service, performance testing, water treatment coordination, and recommendations for energy-saving upgrades. They can also identify developing issues before they become major failures, helping property owners avoid costly disruptions and extend the life of valuable equipment.

An experienced HVAC/R company can also help ensure compliance with applicable regulations, maintain detailed service records, and develop long-term capital replacement strategies that align with a property's budget and operational goals.

Final Thoughts

For landlords and property owners, chillers and cooling towers are much more than pieces of mechanical equipment, they are essential investments that directly impact resident comfort, energy efficiency, operating costs, and the long-term value of a property.

By prioritizing preventive maintenance, maintaining proper water treatment, monitoring system performance, planning for future upgrades, and responding quickly to signs of trouble, owners can maximize the lifespan of these critical assets while minimizing unexpected expenses.

Most importantly, working with a trusted HVAC/R partner ensures these complex systems receive the expert attention they require. With professional installation, routine maintenance, timely repairs, and strategic planning, landlords can provide reliable cooling for their residents, protect their investment, and keep apartments, condominiums, and townhome communities operating efficiently for years to come.

Make sure to keep things cool in your buildings. Contact ABSI today!

About Advanced Building Services, Inc.

Advanced Building Services, Inc. (ABSI) is an employee-owned provider of HVAC, plumbing, electrical, and building maintenance services across Washington, D.C., Maryland, and Virginia. Founded in 1997 and employee-owned since 2022, ABSI delivers 24/7 support with a focus on reliability, efficiency, and personalized service. Its licensed technicians offer everything from preventative maintenance to advanced solutions like UV air purification and boiler system repairs. With a commitment to quality and client satisfaction, ABSI is a trusted partner for comprehensive building care in the DMV region. For more information, please visit advanced-building.com.