Service ExplainersTypes of air conditioners homeowners should know
Central systems, heat pumps, ductless mini splits, window and portable units compared on where each one fits, so you can have a better conversation with an installer.
By Elijah Canfield, Founder, Hire Best Pros · Updated August 26, 2026
Elijah Canfield is the founder of Hire Best Pros. He writes and edits the site's consumer guides, with a focus on how home service and moving projects are priced, scoped and compared.
Central air suits homes that already have ductwork. A heat pump does the same cooling job and also provides heating. Ductless mini splits fit homes without ducts, additions and rooms that never get comfortable. Window and portable units are point solutions for a single room. The right choice depends on your existing ductwork, climate, the space available and how the house is used.
Central air conditioning
An outdoor condenser paired with an indoor coil and the home's duct system. It cools the whole house evenly when the ducts are properly sized and sealed, and it is the usual replacement path in a home that already has ducts.
Heat pumps
A heat pump moves heat in both directions, so it cools in summer and heats in winter. Cold climate models have improved considerably. Sizing and backup heat strategy matter more here than with a cooling only system, so this is a conversation to have in detail with the installer.
Ductless mini splits
- No ductwork required, so they suit older homes, additions and converted spaces
- Zoned by design, since each indoor head is controlled separately
- Visible indoor units, which some homeowners mind and others do not
Not sure which system fits your home?
Find HVAC helpWindow and portable units
Useful for one room, a rental, or a space the main system never reaches. Portable units need a working exhaust to the outside, and both types are noisier in the room than a central system.
What actually decides it
- Whether usable ductwork exists
- Your climate and how many months of heating you need
- Electrical capacity and where outdoor equipment can go
- How many rooms need independent control
Common questions
- Is a bigger system better?
- No. An oversized system cools quickly, shuts off, and leaves humidity behind. Correct sizing comes from a load calculation for your specific house, not from square footage alone.
- Can a heat pump replace my furnace?
- In many homes it can, sometimes paired with backup heat for the coldest days. Whether it makes sense depends on climate, insulation, electrical service and local energy prices.