1 Mar 2026

Buying an air conditioner sounds straightforward: measure your room, pick a BTU rating, done. But in the Caribbean, there are factors that most online buying guides completely ignore — and getting them wrong means years of discomfort, high electricity bills, or both.

Here's a practical, no-nonsense guide to choosing the right AC unit for your Caribbean home, based on what we've learned helping thousands of customers across Trinidad and the region since 1986.

Step 1: Get the BTU Rating Right (The Caribbean Way)

BTU (British Thermal Units) measures the cooling capacity of an air conditioner. The standard rule of thumb is 20 BTU per square foot of room area. But that calculation assumes insulated walls, double-pane windows, and moderate outdoor temperatures — none of which describe a typical Caribbean home.

Caribbean BTU Adjustments

Start with the standard 20 BTU per square foot, then adjust:

  • Direct sun exposure: If the room gets direct afternoon sun, add 10–15%. West-facing rooms in the Caribbean can have enormous solar heat gain.
  • Concrete block construction without insulation: Add 10%. Uninsulated concrete absorbs heat all day and radiates it inward.
  • High ceilings (over 9 feet): Add 10% for every additional foot of ceiling height. Many Caribbean homes have 10- to 12-foot ceilings.
  • Louvre windows or poor sealing: Add 15–20%. Air infiltration through louvres drastically increases the cooling load.
  • Kitchen or high-occupancy room: Add 10–20% for kitchens. Add 600 BTU for each person regularly in the room beyond two.
  • Galvanised roof with no ceiling insulation: Add 15–20%. Metal roofs in direct tropical sun create massive heat gain from above.

Practical Example

A 150 sq ft bedroom (standard master bedroom):

  • Base calculation: 150 x 20 = 3,000 BTU
  • West-facing window: +15% = 3,450 BTU
  • Concrete block, no insulation: +10% = 3,795 BTU
  • 10-foot ceiling: +10% = 4,175 BTU

You'd want at least a 5,000 BTU unit — though a 9,000 BTU unit would handle the load more comfortably and run at lower capacity (especially with an inverter unit, where this means lower energy consumption).

Common mistake: Buying too small and assuming the unit will "catch up." An undersized unit runs continuously at full capacity, consuming maximum electricity without ever reaching the set temperature. You pay more and get less comfort. In the Caribbean climate, it's almost always better to size slightly above the calculated requirement.

Step 2: Choose Your Unit Type

Mini-Split (Ductless Split System)

The most popular choice for Caribbean homes, and for good reason.

  • Pros: Quiet indoor operation, efficient, available in inverter models, no ductwork needed, flexible installation.
  • Cons: Requires professional installation, outdoor unit needs space with adequate airflow.
  • Best for: Individual rooms, bedrooms, living rooms, home offices. Most Caribbean residential installations.

Window Unit

Still common and sometimes the only option for certain building configurations.

  • Pros: Lower purchase price, simpler installation, self-contained.
  • Cons: Noisier, less efficient, limited to rooms with suitable windows, most are non-inverter.
  • Best for: Rental properties, rooms where split installation isn't possible, budget-conscious purchases.

Cassette Unit

Ceiling-mounted units that distribute air in four directions.

  • Pros: Even air distribution, aesthetically clean (mounted in ceiling), good for larger open spaces.
  • Cons: Higher cost, requires ceiling space for installation, professional installation essential.
  • Best for: Offices, retail spaces, open-plan living areas, commercial applications.

Portable Units

  • Pros: No installation needed, can be moved between rooms.
  • Cons: Less efficient, noisy, still need a window exhaust, high energy consumption relative to cooling output.
  • Best for: Temporary cooling, spaces where permanent installation isn't allowed (some rental situations).

Step 3: Pick the Right Brand for Caribbean Conditions

Not all brands perform equally in tropical conditions. After nearly 40 years of selling, installing, and repairing AC units in Trinidad, here's what we carry and why:

  • LG: Strong inverter lineup, excellent humidity control, widely trusted across the Caribbean. Their Dual Cool series is particularly popular for residential use. We also carry LG's PuriCare air purifier line for customers focused on indoor air quality.
  • Gree: One of the world's largest AC manufacturers. Good value across the range, solid performance in tropical conditions. We stock an extensive Gree parts inventory for long-term support.
  • Coldwave: Reliable units at competitive price points, popular in the Trinidad market for both residential and light commercial applications.
  • Carrier: An industry standard for commercial and industrial applications. Premium build quality and parts availability.

A critical factor often overlooked: parts availability. The best AC unit becomes a liability if you can't get replacement parts locally. Every brand we sell is backed by our parts inventory — from circuit boards and compressors to sensors and fan motors.

Step 4: Consider These Often-Overlooked Factors

Voltage Protection

Caribbean power grids are prone to fluctuations. A voltage stabiliser or surge protector is not optional — it's essential. A single power surge can destroy an inverter board costing TTD 2,000–4,000 to replace. A voltage protector costs a fraction of that.

Installation Quality

Even the best unit will underperform if poorly installed. Key installation factors:

  • Outdoor unit placement: needs adequate airflow, shade if possible, and protection from direct sea spray in coastal areas.
  • Proper pipe insulation: exposed refrigerant lines lose efficiency in Caribbean heat.
  • Correct refrigerant charge: too little or too much refrigerant both reduce efficiency and can damage the compressor.
  • Proper drainage: condensate drain must be correctly routed and sloped.

After-Sale Support

Before you buy from any supplier, ask: do they stock parts for what they sell? Can they get you a replacement compressor, circuit board, or fan motor without a 6-week wait for international shipping? This is where a local supplier with deep inventory makes all the difference.

Quick Reference: Room Size to BTU Guide (Caribbean Adjusted)

Room Size (sq ft) Standard BTU Caribbean Adjusted BTU Recommended Unit
100–150 5,000 7,000–9,000 9,000 BTU split
150–250 6,000–8,000 9,000–12,000 12,000 BTU split
250–350 8,000–12,000 12,000–18,000 18,000 BTU split
350–500 12,000–18,000 18,000–24,000 24,000 BTU split
500–700 18,000–24,000 24,000–36,000 36,000 BTU split or cassette

These are general guidelines. Actual requirements vary based on insulation, sun exposure, ceiling height, and occupancy. For larger spaces or commercial applications, a professional load calculation is recommended.

Need help choosing? Browse our residential AC range or contact us for personalised recommendations. Call 1 (868) 658-1910 or WhatsApp 1 (868) 374-7295.