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Ductless vs. Central AC System for Your Home: Advantages and Disadvantages.
For homeowners, the decision between choosing a ductless mini-split system and a conventional central air conditioning system can be a difficult one. Let us compare the major differences between the two options.
Ductless Mini-Split System
A ductless mini-split system has two main components—an outdoor compressor and an indoor air-handling unit. A conduit links the outdoor unit with the indoor unit.
Advantages of a Ductless Mini-Split System
As implied by their name, the ductless mini-split system does not require ductwork, making it the more convenient cooling option for older buildings with thick walls. It basically keeps your room temperature at a constant temperature, unlike an air conditioning unit that goes on and off throughout the day. In the winter, the system works in reverse by absorbing heat from the outside air and moving it indoors to heat your home, too.
Their compact size allows for greater flexibility in temperature zoning—air conditioning is limited to the rooms in which the air handlers are located. These systems tend to run quieter than central air conditioning systems, and are easier to install. Some ductless mini-split models have the highest efficiency rating of any type of air conditioning system.
Disadvantages of a Ductless Mini-Split System
Although a ductless mini-split can save you money in the long run, the initial installation cost can run high. It may be difficult to find qualified, professional installers. Improper sizing or placement can mean that your unit runs less efficiently. There are also some home owners who have aesthetic issues with a wall mounted unit.
Central Air Conditioning System
A central air conditioning system treats air at a central location and distributes it to and from rooms by one or more fans and a series of ducts. Supply ducts and registers carry this cool air from the air conditioner to the home. The air becomes warmer as it circulates through the home; then it flows back to the central air conditioner through return ducts and registers.
Advantages of a Central Air Conditioning System
If your goal is to keep your whole house cool, central air conditioning is most likely your best option. With newer models, you can count on efficient, cool and comfortable temperatures and lower humidity.
The system is also virtually invisible, and it adds value to your home.
Disadvantages of a Central Air Conditioning System
As with the mini-split system, you can run into cost problems if the unit has not been properly sized. (However, the upfront cost is considerably less to just replace an existing system with a new central air system rather than with a ductless mini-split system.)
To summarize, here are the main advantages and disadvantages of both systems:
| DUCTLESS MINI-SPLIT SYSTEM |
| Advantages |
Small size and flexibility
Easy to install
Requires no ductwork
| Disadvantages |
Cost of system is high
Sizing of the system can be tricky
Aesthetics is an issue to some homeowners
CENTRAL AIR CONDITIONING SYSTEM
| Advantages |
Easy to install (with existing ductwork)
Improves value of home
| Disadvantages |
Cost of system is moderately high
Unit requires annual maintenance
Air ducts should be cleaned every 3-5 years
For more information on air conditioning systems, check out When to Replace Your Central Air Conditioning System and What Is a Ductless Mini-Split AC System?