Mini Split vs Central Air: Which Is Better for Michigan Homes?
- Jun 8
- 5 min read
Choosing between a ductless mini split system and traditional central air conditioning can be a more difficult decision than it seems, especially living in the constantly changing climage of Southeastern Michigan. Both systems can keep your home comfortable during the hot and humid Michigan summers, many mini-split systems are now offering options to heat your home as well, but they offer very different advantages depending on your home's layout, existing ductwork, energy efficiency goals, and budget.
If you're considering an AC installation, or planning a complete HVAC system replacement, understanding the differences as well as pros and cons between these two options can help you make the best decision for your home and family.
Whether you live in Troy, Rochester Hills, Royal Oak, Sterling Heights, or anywhere in the area surrounding Metro Detroit, selecting the right HVAC system can improve comfort, lower utility bills, and increase home value. Taking the time to explore and understand your options can be the diferrence between your house being more comfortable than it's ever been, and you AC struggling to cool your home at all!
What Is a Mini Split System?
Although in modern day HVAC, the majority of ductless mini-splits are cold climate heat pumps, ductless systems work almost identically to your typical central air conditioner.
A ductless mini split system consists of:
An outdoor condenser
One or more indoor air handlers or: heads - zones
Electrical & refrigerant lines connecting each component
Remote control(s) or a thermostat to control the system head(s)
There's one key difference between a mini split AC unit and a traditional HVAC system, mini splits do not require ductwork. This means that as long as we can get refrigerant and electrical lines to the indoor air hander, as well as have a place drain the condensate from it, you can install a mini split virtually anywhere, totally unrestricted by ductwork requirements!
While ductless systems are the primary method of heating and cooling homes in Europe and Asia, they're just beginning to become more popular here in the United States. There's a number of reasons we're continuing to see ductless system installations increase throughout Michigan.
Zoned comfort from room to room
High energy efficiency
Flexible installation options
Heating and cooling capabilities
What Is Central Air?
Central air conditioning is undoubtedly the most popular way Michigan homeowners keep their homes cool during the humid summers of Oakland County and the surrounding areas.
A central air conditioning system uses:
An outdoor condenser
A single indoor evaporator coil
Existing ductwork connecting to the evaporator coil
A central thermostat
Cool air is distributed and recirculated through air ducts to every room in the home.
For the many homes throughout Metro Detroit that already have ductwork installed, sticking with a typical central air conditioner installation is likely the first choice that comes to mind, and for good reason! As long as your duct system was designed and sized correctly, central air conditioning remains one of the most effect ways of cooling your home throughout the sweltering months of summer.
Feature | Mini Split | Central Air Conditioner |
|---|
Ductwork Required: | No | Yes |
Energy Efficiency: | Highest in Industry | Moderate to High |
Room-by-Room Control: | Yes - Highly Customizable | Limited |
Whole Home Cooling: | Good | Excellent |
Retrofit Homes: | Excellent | Often More Difficult |
Upfront Cost: | Higher Based on Number of Heads | Lower if ductwork exists |
Energy Efficiency Comparison
Comparing efficiency ratings between ductless mini split systems and standard central air conditioning does no favors for central AC. The highest SEER rating you'll typically see in a modern day air conditioner is right around 20 SEER, and while highly efficient, these are some of the most expensive systems in the industry. Mini split systems on the other hand start at SEER ratings of 20+, and for a fraction of the cost of their central AC counterparts. Ductless systems can reach efficiency ratings of 35 SEER and beyond!
Because there are no ducts, homeowners avoid massive energy losses that commonly occur through duct leakage.
This can be particularly beneficial in older Michigan homes in historic areas such as Grosse Pointe or St. Clair Shores, where existing duct systems may be poorly sealed or undersized, and installing new ductwork may be a difficult endeavor that will cost tens of thousands of dollars!
When comparing the efficiency ratings between ductless systems and typical air conditioners, there's an obvious winner.
How Much Energy are Leaking Ducts Costing You?
Unsealed leaking ducts can contribute to an extra 20%-30% of your energy bill.
This translates to an extra $200-$600+ on your energy bills annually.
Comfort and Temperature Control
One of the greatest advantages of ductless installation is the personalized comfort that comes from zoning.
With a central air conditioner:
Entire home uses one thermostat
Temperatures are generally uniform
Air distribution relies heavily on ductwork
With a ductless mini split:
Each room can have its own temperature and humidity setting
The indoor air handlers are controlled by remote(s) or a central thermostat
Air distribution is determined entirely by the placement of the air handler or "head(s)"
This makes mini splits the perfect heating and cooling solution for:
Home additions
Finished basements
Bonus rooms
Older homes with poorly designed or non-existent ductwork
Multi-story homes with hot or cold spots
Installation Cost Comparison
Central air conditioning is generally the less expensive option if:
Existing ductwork is already present
You are installing a low to mid SEER air conditioner (14 SEER - 17 SEER)
Your ducts are properly sized for your home
Your ducts are in good condition and not in need of serious repair or alterations
In a household or room that lacks ductwork, or for new additions to your home that would require upsizing your current HVAC system, a ductless mini split is almost always the less expensive option, in the long and short term.
Mini split installation is often the less expensive option when:
No ductwork exists - Whether in the whole home or specific rooms
Home additions need conditioning
Only certain areas need heating or cooling
The actual installation cost depends on:
Size of your home & the space needing heating and cooling
Number of zones or heads
Existing HVAC infrastructure
Electrical requirements
Which System Is Better for Michigan Winters?
As the HVAC industry continues to improve, so do modern day heating and cooling systems, and ductless mini splits are no exception to this rule. While in the past, ductless systems exclusively offered air conditioning, most homeowners don't realize that modern mini split systems are now built to provide heating as well!
Cold-climate heat pumps now offer highly efficient and reliable heat even during the coldest Michigan winters.
For homeowners looking to reduce natural gas usage, or provide both heating and air conditioning to a bonus room or room without ductwork, a mini split system is likely the all in one solution you've been looking for to provide year-round comfort.
Best Homes for Mini Splits
Mini splits are the ideal heating and cooling solution for:
Older homes without ducts
Historic homes
Home additions
Finished garages
Bonus rooms
Sunrooms
Multi-family properties
Best Homes for Central Air
Central air conditioning is often the better option for:
Homes with existing ductwork
Larger homes
Open floor plans
Existing central air conditioner replacement
New construction
Homeowners seeking whole-home comfort
Mini Split vs Central Air: Which Should You Choose?
Choose a Mini Split If:
✔ You want room-by-room temperature control
✔ You don't have ductwork
✔ You need maximum efficiency
✔ You want heating and cooling in one system
Choose Central Air If:
✔ You already have ducts
✔ You want whole-home cooling
✔ You prefer a single thermostat
✔ You want the lowest installation cost when ductwork already exists
Why Michigan Homeowners Trust WeatherWise for Everything Air Conditioning
WeatherWise Heating & Air Conditioning is proud to spend another year as a top rated HVAC service provider to homeowners throughout Oakland County, Macomb County, and Wayne County with professional heating, cooling, and indoor air quality solutions. We service all major brands of residential heating and cooling equipment and help homeowners choose the HVAC system that best fits their household and budget.
Still Not Sure Which System Is Right For Your Home?
Get expert guidance from Metro Detroit's HVAC service specialist.
