Ten years ago, ductless mini-splits were mostly seen as a solution for rooms without ductwork — sunrooms, garage conversions, above-garage bedrooms. Today, they're a legitimate whole-home option that's giving traditional central air a run for its money in certain situations.
But they're not the right choice for every home. Here's a practical comparison from a technician who installs both systems every week.
How Each System Works
Central Air Conditioning
A central AC system uses a single outdoor compressor and an indoor evaporator coil (typically paired with a furnace) to cool air, which is then distributed through ductwork to every room. A single thermostat controls the whole house.
Ductless Mini-Split
A mini-split uses a small outdoor compressor connected to one or more indoor wall-mounted units, each with its own thermostat. There's no ductwork — refrigerant lines run through a small hole in the wall. Each indoor unit controls its own zone independently.
Side-by-Side Comparison
Central AC Advantages
- Lower cost to cool an entire home
- Invisible — no wall units in rooms
- Uses existing ductwork
- Single-point maintenance
- Better for homes over 2,500 sq. ft.
- Higher resale familiarity
Mini-Split Advantages
- No ductwork needed
- Zone-by-zone temperature control
- Higher energy efficiency (20+ SEER)
- Quieter operation
- Heating + cooling in one unit
- Easier installation — less invasive
When Central AC Is the Better Choice
You already have ductwork in good condition. If your home has a forced-air furnace and existing ducts that are properly sized and sealed, central AC is almost always the more cost-effective choice for whole-home cooling. You're adding one outdoor unit and one coil — the distribution system is already there.
You're cooling a large home. For homes over 2,500 square feet, central AC is more practical. Cooling that space with mini-splits would require 4–6 indoor units, which drives the installation cost well past a central system.
Aesthetics matter to you. Some homeowners simply don't want wall-mounted units in their living spaces. Central AC is completely hidden — the only visible component is the outdoor condenser.
When a Mini-Split Wins
Your home doesn't have ductwork. Older homes, radiant-heated homes, and some newer builds don't have ducts. Installing ductwork from scratch can cost $5,000–$10,000+ and requires significant construction. A multi-zone mini-split avoids all of that.
You want room-by-room control. This is the mini-split's biggest functional advantage. With central AC, the bedroom and the kitchen get the same treatment. With a mini-split, you can keep the bedroom at 20°C for sleeping while the rarely-used guest room stays off entirely. Over a season, that selective cooling translates to real savings.
You're adding cooling to a specific space. Finished basements, home offices, additions, above-garage rooms — these are classic mini-split use cases. Running ductwork to a single room is expensive and invasive. A single-zone mini-split handles it cleanly.
You want heating too. Modern mini-splits are heat pumps — they cool in summer and heat in winter. In Ontario's climate, a cold-climate mini-split can handle heating down to -25°C or lower, which makes it a year-round solution for supplementing or replacing your existing heating system.
Cost Comparison
Installed costs vary by brand, home size, and complexity, but here are realistic ranges for our service area:
- Central AC (with existing ducts): $4,500–$7,500 installed
- Single-zone mini-split: $3,500–$5,500 installed
- Multi-zone mini-split (3–4 zones): $10,000–$16,000 installed
The single-zone mini-split is often cheaper than central AC for a single room. But once you scale to whole-home coverage with multiple indoor units, the cost exceeds a central system. The tradeoff is energy savings over time and the ability to heat and cool with one system.
Installation Considerations
Central AC requires a few hours of work, mostly connecting the outdoor unit to the indoor coil and charging the system. If the furnace and ducts are already there, it's straightforward.
Mini-split installation involves mounting indoor units, running refrigerant lines through exterior walls, and connecting everything to the outdoor compressor. It's less invasive than running ductwork, but each indoor unit needs its own mounting location and a small exterior penetration.
Both systems should be installed by a TSSA-certified technician in Ontario. Improper sizing or installation degrades performance regardless of which system you choose.
The Bottom Line
If you have ducts, go central. If you don't, go mini-split. If you have ducts but a problem room, add a single-zone mini-split there. And if you're building new and want maximum flexibility and efficiency, a multi-zone mini-split system is worth pricing out.
There's no one-size-fits-all answer, which is exactly why we do site assessments before recommending a system. Every home is different — and the right cooling solution depends on your layout, your budget, and how you actually use your space.