Your facility's HVAC system struggled through another summer, and now the chiller is throwing fault codes at 11 PM on a Friday. The on-call technician can't tell if it's a refrigerant issue or a condenser fouling problem — because the last maintenance log was filled out six months ago in a spreadsheet no one can find. If your team is treating HVAC and chiller maintenance as the same job with the same schedule, you're operating blind. Sign in to OXmaint and bring both systems under one structured maintenance platform.
HVAC and Chillers Are Not the Same System
Most facilities manage HVAC and chiller maintenance under one generic "mechanical systems" program. This creates dangerous gaps — chiller compressors need oil analysis every 1,000 hours while HVAC air handlers need coil cleaning every 90 days. Mixing these timelines causes both over-servicing and critical under-servicing. Start your free OXmaint account to build separate, asset-specific PM schedules that eliminate this confusion entirely.
HVAC vs. Chiller: Side-by-Side Comparison
Understanding where these systems diverge is the foundation of effective maintenance planning.
HVAC Preventive Maintenance Checklist
HVAC maintenance is high-frequency and inspection-driven. Every task missed compounds into comfort complaints, IAQ violations, and energy waste. Log in to OXmaint to assign these tasks automatically on recurring schedules.
Clogged filters are the single most common cause of HVAC energy waste and equipment stress. A filter choked to 50% capacity forces the blower to work 30% harder and can reduce airflow enough to freeze evaporator coils.
Evaporator and condenser coils lose efficiency fast. A 0.042" layer of biofilm on coil surfaces can reduce heat transfer by up to 21%, driving up compressor runtime and utility costs every single hour the unit runs dirty.
Blocked condensate drains are the leading cause of water damage claims in commercial buildings. A single blocked drain pan can overflow and cause thousands in ceiling and floor damage within hours during high-humidity seasons.
Stop Running Separate Spreadsheets for HVAC and Chiller Maintenance
OXmaint lets you build asset-specific PM schedules, assign technicians by certification, and capture inspection data in real time — from mobile, on the floor. Every checklist above is ready to deploy in minutes.
Chiller Preventive Maintenance Checklist
Chiller maintenance is data-driven and precision-focused. Small deviations in approach temperature or oil quality are early warnings of failures that cost six figures to fix. Create your free account to track chiller performance trends over time — not just point-in-time inspections.
The compressor is the most expensive single component in any chiller — replacement costs range from $20,000 to $80,000. Oil analysis and vibration trending give you 4–8 weeks of warning before failure in most cases.
Tube fouling is the silent chiller killer. Every 0.001" of fouling on evaporator or condenser tubes increases chiller energy consumption by 1–2%. Over a year, this adds up to thousands in unnecessary utility costs before anyone notices a problem.
Refrigerant leaks are both environmentally regulated and operationally expensive. EPA Section 608 requires leak inspections for chillers with more than 50 lbs of refrigerant charge, and violations carry fines up to $44,539 per day per violation.
Best Practices: Where HVAC and Chiller Programs Differ Most
Frequency-Based vs. Condition-Based Scheduling
HVAC maintenance follows fixed calendar schedules — filters every 30–90 days, coil cleaning quarterly. Chiller maintenance must be condition-driven. A chiller running at low load in a mild climate may need tube cleaning every 18 months, while the same chiller on a dirty cooling tower in a humid climate needs it every 6 months.
The best programs track both. OXmaint's PM engine lets you set calendar triggers for HVAC tasks and meter/condition triggers for chiller tasks in the same platform. Sign in and set up your first condition-based PM — it takes under 10 minutes.
Documentation Requirements Are Not the Same
HVAC work orders need filter size, MERV rating, and coil cleaner product used. Chiller work orders need compressor suction and discharge pressures, approach temperatures, oil analysis results, refrigerant charge weights, and EPA leak inspection records. Paper-based logs and generic CMMS templates miss half these fields.
OXmaint provides asset-specific work order templates that prompt technicians for exactly the right data at the right time — no generic catch-all forms. Book a demo to see chiller-specific templates live.
Certification and Skill Requirements Differ by System
A skilled HVAC technician with EPA 608 Type II certification can handle rooftop units, air handlers, and split systems. But centrifugal and absorption chillers require different expertise — chiller manufacturers typically require their own factory-certified technicians for warranty work, and specific certifications are required to handle large refrigerant charges under EPA Section 608 Universal certification.
When you assign work in OXmaint, the system can enforce certification requirements — preventing an HVAC tech from being assigned to a chiller compressor overhaul they're not qualified to perform. Proper skill matching prevents warranty voids and safety incidents.
How OXmaint Handles Both Systems in One Platform
You shouldn't need two systems to manage two types of equipment. OXmaint unifies HVAC and chiller maintenance under one roof — from scheduling to documentation to performance trending.
Separate PM Templates per Asset Type
Build distinct checklists for AHUs, RTUs, centrifugal chillers, and absorption chillers — each prompting for the exact fields that matter.
Condition-Based Trigger Engine
Set PMs to trigger on runtime hours, approach temperature deviation, or oil analysis results — not just calendar dates.
Performance Trend Tracking
Chart chiller kW/ton, approach temperature, and compressor amps over time to spot degradation trends weeks before failure.
Mobile Work Order Capture
Technicians complete inspections on mobile — offline-capable, with photo attachments and e-signature for compliance documentation.
We were treating our three 500-ton centrifugal chillers the same way we treated our 40 rooftop units — same inspection form, same cadence, same technician. After deploying OXmaint with separate asset classes, we caught a compressor oil contamination issue during a routine log entry. That catch alone saved us an estimated $65,000 in compressor replacement costs and three weeks of partial cooling outage.
Build Separate, Purpose-Built Maintenance Programs for Every System You Operate
HVAC and chillers are different machines with different failure modes, different compliance requirements, and different cost profiles. OXmaint gives you the structure to maintain each one correctly — on a single platform your whole team can use from day one.
