10 Dec 2025

December in the Caribbean isn't the "end of cooling season" like it is up north — our systems run just as hard in December as they do in August. But the end of the year is a natural time to take stock, catch up on deferred maintenance, and make sure your AC system is in the best shape possible heading into another year of year-round operation.

Here's a comprehensive checklist that covers everything from simple homeowner tasks to items that need a qualified technician. Use it for your own system, or if you're an HVAC contractor, share it with your customers as a service reminder.

The Homeowner Checklist (No Tools Required)

1. Check Your Filters

This is the single most impactful maintenance task, and it takes 5 minutes. Pull out your air filter and look at it. If it's grey, dusty, or you can't see light through it, it needs to be cleaned (washable filters) or replaced. In Caribbean conditions, monthly filter maintenance should be the standard — but if you've been slack, now is the time to catch up.

While you're at it, buy a few replacement filters to keep on hand so you don't have a reason to skip next month.

2. Listen to Your System

Turn off the TV and any other noise, and actually listen to your AC running. Healthy systems have a consistent, steady sound. Warning signs include:

  • Clicking or clacking — could indicate a loose fan blade, debris in the unit, or a failing contactor.
  • Grinding or squealing — usually a motor bearing issue. Needs attention soon before the motor fails entirely.
  • Hissing — may indicate a refrigerant leak.
  • Short cycling (frequent on-off) — could be anything from a dirty filter to a failing compressor. If it's cycling more than 3–4 times per hour, something is wrong.

3. Check Your Outdoor Unit

Walk outside and inspect your condenser unit:

  • Is vegetation encroaching? Clear at least 60 cm of space around all sides for proper airflow.
  • Are the condenser fins visibly dirty or bent? Dirty fins need professional cleaning. Mildly bent fins can be straightened with a fin comb.
  • Is the unit sitting level? Settling or shifting can stress refrigerant connections over time.
  • Any rust or corrosion? Coastal locations especially — note any areas where the cabinet or coils are corroding.

4. Test Your Thermostat

Set your thermostat to a temperature noticeably below the current room temperature. The system should start within a few minutes. Once it's been running for 15 minutes, check that the air coming from the vents feels genuinely cold — not just cool, but cold. Lukewarm air from the vents often indicates low refrigerant, a dirty evaporator coil, or an airflow restriction.

5. Check Your Condensate Drain

Find where the condensate drain exits your building (usually a small PVC pipe near the indoor unit or exiting through an exterior wall). Water should drip steadily when the system is running. If there's no water, or if you notice water staining or dripping from the indoor unit itself, the drain is likely clogged.

The Technician Checklist (Professional Service)

These items require a qualified HVAC technician. If you haven't had a professional service visit in the past 6 months, the end of the year is the ideal time to schedule one.

6. Refrigerant Level Check

Low refrigerant means reduced cooling capacity, higher energy consumption, and increased compressor strain. A technician can measure subcooling and superheat to verify proper charge. If refrigerant is low, there's a leak that should be found and repaired — simply topping up without fixing the leak is a temporary (and expensive) solution.

7. Electrical Component Inspection

A technician should check:

  • Capacitor values — capacitors weaken over time. A capacitor testing at 10% or more below its rating should be replaced proactively.
  • Contactor condition — pitted or burnt contacts increase resistance and energy consumption, and will eventually fail.
  • Wire connections — tighten all connections and check for corrosion, especially in coastal areas.
  • Amp draw — measure compressor and fan motor amperage against manufacturer specifications. Elevated amp padding indicates a component working harder than it should.

8. Coil Cleaning

Both the evaporator (indoor) and condenser (outdoor) coils should be professionally cleaned at least once a year. In the Caribbean's dusty, salty conditions, twice a year is better. Clean coils mean efficient heat transfer, lower energy bills, and longer compressor life.

9. Drain Line Flush

A technician should flush the entire condensate drain line with a cleaning solution to prevent algae and biofilm buildup that leads to clogs. In the Caribbean's warm, humid conditions, biological growth in drain lines is aggressive.

10. Overall System Performance Assessment

A good technician doesn't just check individual components — they assess how the system is performing as a whole:

  • Supply and return air temperature differential (should be 7–10 degrees Celsius)
  • Airflow volume and distribution
  • Operating pressures
  • Unusual vibrations or sounds
  • System run time and cycling frequency

The Upgrade Assessment

Year-end is also a good time to evaluate whether your current system is still the right one:

  • Is your system more than 10 years old? Efficiency has improved significantly. A modern inverter unit may pay for itself in energy savings within 2–3 years.
  • Are repair costs increasing? The general rule: if a single repair costs more than 50% of a replacement unit, replacement is the better investment.
  • Has your space changed? Renovations, room additions, or changes in occupancy may mean your system is no longer properly sized.
  • Is your system still using R-22 refrigerant? With R-22 being phased out, availability is declining and prices are rising. If your system uses R-22, planning a transition to a newer system using R-410A is increasingly important.

Parts to Stock Up On

If you're handy or you're a technician doing your own year-end prep, here are commonly needed items worth keeping on hand:

  • Replacement air filters (buy a year's supply)
  • Condensate drain treatment tablets
  • Coil cleaning chemical
  • Common capacitor values (25, 30, 35, 40, 45 microfarad)
  • Electrical contact cleaner

All available on our website with delivery across Trinidad and Tobago.

Need to schedule a year-end service or stock up on parts? Visit servair.com or call us at 1 (868) 658-1910. WhatsApp: 1 (868) 374-7295.