Which is more energy efficient, central AC or mini-split?

Mini-split systems are generally more energy-efficient because they avoid energy loss from ductwork. A high-efficiency mini split typically runs 18-30+ SEER2 vs 14-22 SEER2 for central AC. That said, if you already have well-sealed ducts and a high-efficiency central system, the real-world difference narrows considerably.

Can I install a mini-split in a home that already has ductwork?

Yes. Mini splits are often used to supplement central AC in areas that central systems can't easily reach - room additions, finished basements, detached garages. They're not mutually exclusive.

How much does it cost to install a mini-split system?

A single-zone mini split system typically costs $5,500 to $10,000 installed in Denver metro. Multi-zone systems (2-4 indoor heads off one outdoor unit) generally run $10,000 to $18,000 depending on the number of zones and accessibility.

Do mini-split systems require more maintenance than central AC?

The main difference is filter cleaning frequency - mini split filters need cleaning every 4-6 weeks vs every 1-3 months for a central AC filter. Both systems benefit from annual professional service.

Mini Split vs Central Air: Which Is Right for You?

Got ducts? Central AC. No ducts? Mini splits.

The simplest answer to "ducted vs ductless": if your home already has ductwork, central AC is typically the most cost-effective path to whole-home cooling. No ductwork - or cooling a specific room, addition, or garage - and mini splits are almost always the better choice.

Both systems work well. The decision usually comes down to your home's existing infrastructure, not which technology is "better." We install both across Denver metro, and the right pick depends on your house, not a preference for one system over the other.

Central AC is typically better when...

Your home already has ductwork in place
You want whole-home cooling from one outdoor unit
Budget is the primary concern and ducts are in good shape

Mini splits are typically better when...

No existing ductwork, or it isn't worth extending
You want independent temperature control per room or zone
Adding a room addition, garage, or detached space

3D isometric cutaway of a house showing HVAC ductwork, furnace, and air handler across rooms — Ducted vs ductless: floor plan comparison

Central Air Conditioning

Central AC circulates cooled air through a network of ducts connected to a single outdoor condenser and indoor air handler. If your home already has a forced-air furnace, it very likely has the ductwork a central AC system needs - adding AC then becomes a matter of pairing an outdoor condenser with the existing air handler, rather than running new distribution throughout the house.

Carrier Infinity outdoor condenser unit on gravel beside rocks and evergreen trees — Central AC outdoor unit

Central AC

Best for homes with existing forced-air ductwork

Whole-home cooling through one outdoor unit
Lower install cost when ductwork already exists
Indoor components hidden in utility space
Familiar technology, widely serviced
High installation cost if ductwork must be added from scratch
Leaky or uninsulated ducts reduce efficiency
Single thermostat - no per-room temperature control without added zoning hardware

Ductless (Mini-Split) Systems

Mini-split systems pair one outdoor compressor with one or more wall-mounted (or ceiling cassette) indoor units. Each indoor unit handles its own zone independently. Because there's no duct network, installation requires only a small refrigerant line set through the wall - far less invasive than running ductwork through finished ceilings and floors.

Modern mini splits are also heat pumps, meaning they can both cool in summer and heat in winter with high efficiency - an advantage if you're replacing both a window AC and electric baseboard heat at the same time. Our mini-split sizing guide covers how to pick the right capacity for each zone.

White wall-mounted mini-split indoor unit above a modern dining room with garden view — Wall-mounted indoor unit: no ductwork required

Mini Splits

Best for no-duct homes, additions, garages, or zone control

No ductwork required - works in older homes, additions, detached spaces
Per-zone temperature control - each room set independently
Higher efficiency - no duct losses
Also heats - can replace electric baseboard or radiant
Quieter operation (compressor stays outside)
Higher upfront cost when cooling multiple rooms across a whole home
Visible wall units - not to every homeowner's taste
Filter cleaning every 4-6 weeks (more frequent than central AC filters)

Side-by-side comparison

The table below covers the most common decision factors. Costs are typical Denver metro ranges - see our detailed breakdowns for central AC installation cost and mini-split installation cost for more detail on what drives the price.

Factor	Central AC	Mini Split
Ductwork required	Yes - existing or new	No
Whole-home coverage	Yes, one system	Yes, with multi-zone setup
Install cost (ducted home)	$5,000 - $12,000	$5,500 - $15,000+
Install cost (no ducts)	$15,000 - $30,000+	$5,500 - $15,000+
Efficiency (SEER2)	14 - 22 SEER2	18 - 30+ SEER2
Per-zone control	Requires add-on zoning	Built in
Heating capable	No (separate furnace)	Yes (heat pump)
Indoor unit visibility	Hidden in utility space	Wall or ceiling mounted
Filter maintenance	Every 1-3 months	Every 4-6 weeks

Costs are typical ranges for Denver metro. Get a free estimate for your specific home.

Which is right for your home?

If your home has a functioning forced-air furnace and ductwork in reasonable condition, central AC is almost always the most cost-effective choice for whole-home cooling. If you're starting from scratch, adding a room, or want zone control, mini splits are the practical answer - and often the more efficient one.

There is no universal winner. We install both. When you contact us for an estimate, we'll look at your existing infrastructure and give you a straightforward recommendation based on what makes sense for your house - not what's easiest to sell.