Commercial HVAC Preventive Maintenance Checklist by Season

A commercial HVAC preventive maintenance (PM) checklist works best when it follows the seasons: clean and test cooling equipment in spring, monitor it under load in summer, prepare heating in fall, and verify it in winter. Tying each task to the weather that will test it keeps the work specific and easy to schedule.

For a multi-location brand, the stakes multiply. One failed rooftop unit in July can close a dining room or send shoppers home, and across dozens of locations those odds add up fast. A shared checklist gives facilities managers and regional teams the same scope for every site and every service provider.

This post walks through each season, then covers the mistakes that undo a good PM program and answers common questions. Confirm final intervals against manufacturer guidance and local code for your equipment.

Spring: Get cooling systems ready before the first hot week

Spring PM prepares cooling equipment for peak load, so finish it before sustained heat arrives. Start with the items that affect airflow and heat transfer, then move to controls and electrical.

• Filters: Replace or clean every filter. Clogged filters raise energy use and strain blower motors.
• Coils: Clean evaporator and condenser coils. Dirty coils cut cooling capacity and push compressors harder.
• Refrigerant: Check pressures and inspect lines, fittings, and valves for leaks. Record any charge or recovery by asset.
• Condensate drains: Flush drain lines and pans to prevent clogs and ceiling water damage.
• Belts, bearings, and motors: Inspect for wear, check belt tension, and lubricate where the manufacturer calls for it.
• Controls: Test thermostats, verify setpoints and occupancy schedules, and confirm economizers and dampers move freely.
• Electrical: Tighten connections and check contactors, capacitors, and amp draw.

Finish with a cooling test on every unit. Log supply and return air temperatures so you have a baseline to compare against in July.

Summer: Check the units working hardest at peak load

Summer PM is a shorter, more frequent round of checks on equipment running near capacity. Monthly or quarterly visits catch small problems before they turn into weekend emergencies.

• Filters: Swap filters mid-season at locations with heavy foot traffic, kitchens, or nearby construction.
• Condenser coils: Clear leaves, cottonwood, grease, and debris from outdoor units and rooftop coils.
• Temperature split: Compare supply and return air temperatures against your spring baseline. A shrinking split points to refrigerant, airflow, or coil trouble.
• Evaporator coils: Look for ice or frost, which signals low airflow or low refrigerant.
• Condensate lines: Confirm drains are flowing. Algae growth peaks in warm, humid weather.
• Repeat calls: Review the past 12 months of work orders for units with recurring cooling complaints. A unit that keeps drawing calls belongs on the replacement conversation list.

Summer is also the time to confirm your service providers are completing the full checklist, not only showing up.

Fall: Prepare heating systems before the first cold snap

Fall PM readies heating equipment for the season, so schedule it before overnight lows reach freezing. Heating components sit idle for months, which makes combustion and safety checks the priority.

• Heat exchangers: Inspect for cracks, corrosion, and soot. A damaged exchanger is a safety issue as well as a comfort issue.
• Burners and ignition: Test ignition, clean burners, and check flame sensors.
• Venting and flue: Confirm flues are clear and sealed, and test combustion.
• Gas connections: Check piping and fittings for leaks, and verify shutoff valves operate.
• Filters and blower: Replace filters and inspect the blower wheel and motor.
• Rooftop units: Check panels, gaskets, and roof curbs for gaps that let in water and cold air.
• Controls: Switch thermostats and schedules to heating mode and confirm the changeover works.

Run each heating unit through a full cycle and log the temperature rise across the heat exchanger. That reading becomes your winter baseline.

Winter: Verify heating performance and plan next year's replacements

Winter PM confirms heating equipment performs under real load and sets up next year's capital decisions. Visits can be lighter than in spring and fall.

• Filters: Check monthly. Closed buildings recirculate more dust.
• Heating output: Compare temperature rise to your fall baseline and investigate short cycling.
• Outdoor equipment: Clear snow and ice from heat pumps, condensers, and intake and exhaust openings.
• Condensate lines: Check for freezing, especially on high-efficiency furnaces and lines near exterior walls.
• Comfort complaints: Look for patterns by location. The same cold spot every January points to a duct, damper, or control issue.

Use the quieter weeks to review the year. Rank units by repair spend and age, flag the ones nearing end of life, and build next year's replacement budget from that list. A replacement index that scores assets on repair cost, failure risk, and remaining useful life makes this review faster.

Common mistakes in seasonal HVAC maintenance

The most common failures in HVAC PM programs come from inconsistency, not from missing technical knowledge.

• Using a different checklist at every location. Mixed scopes make sites impossible to compare and providers impossible to hold to one standard. Give every provider the same checklist for the same equipment type.
• Accepting a PM invoice without proof. Require completed checklists, photos, and readings with each visit before approving payment.
• Skipping filter changes between visits. Filters are the cheapest task and the most common cause of avoidable calls.
• Tracking PM in spreadsheets and inboxes. Recurring work orders with upcoming, completed, and overdue views show what is late without anyone chasing it.
• Ignoring equipment records. Model, serial number, warranty, and service history decide whether a repair makes sense.

FAQ

How often should commercial HVAC units get preventive maintenance?

Most commercial HVAC units need professional PM at least twice a year, once before cooling season and once before heating season. Units in kitchens, high-traffic stores, or dusty environments often need quarterly visits, and manufacturer guidance sets the final interval.

What does a commercial HVAC preventive maintenance visit include?

A standard visit covers filters, coils, refrigerant checks, belts and motors, electrical connections, drains, and controls, with combustion and safety checks added in fall. Technicians should complete a checklist and record readings for each unit.

Who should perform HVAC preventive maintenance at my locations?

Licensed, insured HVAC technicians should perform the work, and anyone handling refrigerant needs EPA Section 608 certification. Whether you use in-house technicians or outside service providers, give them the same checklist.

Can we keep our current HVAC service providers if we move to maintenance software?

Yes. With OpenWrench, the service providers you already work with join WrenchHub free, with no per-invoice fees, so you keep your relationships and your rates.

How do you track HVAC preventive maintenance across multiple locations?

Set up recurring work orders by location or asset, attach the seasonal checklist, and track upcoming, completed, and overdue visits in one place. That view shows which sites are behind without calls or email threads.

OpenWrench software makes it easy to stay on top of commercial HVAC preventive maintenance year-round. Book a demo today.