Your Guide to Spring Prep for HVAC

Make the most of shoulder‑season weather to lower summer bills, improve indoor air quality, and reduce compliance risk across the Bluegrass.

Why spring in Kentucky is prime HVAC tune‑up time

Mild days, cool nights, fast humidity swings, bursts of pollen, and the occasional thunderstorm make spring the best window to re‑tune controls, clean heat‑transfer surfaces, and ready cooling equipment before peak heat. Two big levers deliver fast payback here: (1) dialing in economizers for “free cooling,” and (2) tightening operations & maintenance (O&M) so equipment only runs when and how it should.

Optimize economizers for shoulder‑season savings

When outdoor air is cooler and drier than return air, economizers can meet cooling demand with fresh air instead of compressors—perfect for many Kentucky spring mornings and evenings. Verify dampers, actuators, and OA/RA/MAT sensors, then commission enable/lockout setpoints and minimum outdoor air. Poorly tuned economizers are “silent energy wasters” (stuck dampers, failed sensors), while well‑tuned ones cut runtime and improve IAQ.

Pro move: Treat March–April as economizer season—make a quick “mini‑commissioning” pass now so you harvest spring’s free cooling before summer heat arrives.

Filter for pollen: target MERV 13 (if your fans can handle it)

Spring pollen and fine particulates surge in the Ohio Valley. Aim for MERV 13 filtration in offices and most commercial occupancies to capture smaller particles; if your fans can’t handle the added resistance, install the highest MERV your system supports and monitor differential pressure across filters.

Clean coils, pans, and drains to restore capacity

Winter dust, construction residue, and biofilm reduce heat transfer and airflow. Deep‑clean evaporator & condenser coils, sanitize drain pans, and clear condensate lines to prevent overflow and moldy odors. Field research shows coil restoration delivers measurable airflow and energy improvements in real buildings, and multi‑site studies find significant fan energy reductions after professional HVAC cleaning.

Ventilation: verify you meet ASHRAE 62.1 for spring operation

Confirm minimum outdoor air and distribution meet ASHRAE 62.1. The 2025 edition sharpened guidance (e.g., humidity control requirements and control sequences), so it’s a good time to re‑check sequences, demand‑control ventilation setpoints, and sensor calibrations as occupancy patterns change in spring.

Cooling towers: spring startup with Legionella in mind

Before you bring towers and evaporative condensers back online, update your water management program and follow ASHRAE Guideline 12 and CDC steps to clean/disinfect and establish control limits (residuals, pH, blowdown). Biofilm, sediment, water age, and inconsistent disinfectant residuals are key Legionella risk drivers—treat them explicitly at startup.

Compliance tip: Some jurisdictions require documented startup procedures and sampling (for example, New York City). Always check local requirements; even where sampling isn’t mandated, documenting cleaning/disinfection and results is a best practice.

Refrigerant management: know the 2026 EPA rules

As of January 1, 2026, U.S. leak repair requirements apply to appliances with ≥15 lb of certain refrigerants (HFCs above a specified GWP), expanding the number of comfort‑cooling systems that must have leak rates calculated whenever refrigerant is added and repaired within timelines if thresholds are exceeded. Keep accurate refrigerant logs, technician credentials, and verification test records to stay audit‑ready.

Central plant & packaged cooling: start clean, verify performance

For chillers and large packaged units, follow the OEM’s spring startup procedures (oil levels, strainers, safeties, sensor checks), then compare early‑season operation against rated performance and design flows. AHRI standards provide the performance rating framework; your startup checklist should confirm you’re operating near those rated conditions.

Controls that pay in spring: schedule & setpoint tune‑ups

Adopt ENERGY STAR’s O&M mantra: “tune it up, turn it off, and check it out.” Update occupied/unoccupied schedules to spring hours; add night purge where climate‑appropriate; and implement supply air temperature and static pressure resets so fans and compressors don’t work harder than needed during mild weather. Document changes and track savings.

Kentucky‑Smart Watchouts

• Humidity whiplash: Swing days can push systems into short‑cycling. Verify dehumidification logic and coil temperatures to hold indoor RH in a comfortable band while economizers are active. (Aligns with 62.1’s expanded control focus.)

• Storm debris & cottonwood: After wind events, quickly check rooftop intakes and condenser coils; clogged fins kill heat rejection just when you need it. Restoring clean surfaces is a proven energy saver.

• Pollen surges: Use differential pressure to fine‑tune filter change intervals rather than relying on fixed dates during peak pollen weeks; validate that upgraded filters haven’t starved airflows.