Central AC vs. Window Units: Which Makes Sense for You?
Central AC costs more upfront but offers whole-home comfort. Window units are cheaper but have limitations. Here's how to decide.
When adding air conditioning to a home that doesn't have it, or deciding whether to upgrade, the central AC vs. window unit question often arises.
Central Air Conditioning
Advantages - Cools the entire home consistently - Quiet operation (compressor is outside) - Better humidity control - Doesn't block windows or views - Longer lifespan - Increases home value
Disadvantages - High upfront cost ($3,000-$7,000+ installed) - Requires ductwork (expensive to add if not present) - Cools entire home even when you only need one room - Professional installation required
Window Units
Advantages - Low cost ($150-$700 per unit) - Easy DIY installation - Cool only rooms you're using - No ductwork needed - Can remove for winter
Disadvantages - Blocks windows - Noisier (compressor is inside) - Each room needs its own unit - Less efficient overall - Security concerns (open window) - Limited humidity control - Multiple units look cluttered
When Central AC Makes Sense
- Your home has existing ductwork
- You want whole-home cooling
- You value quiet, consistent comfort
- You plan to stay in the home long-term
- Aesthetics matter to you
When Window Units Make Sense
- You only need to cool one or two rooms
- You're renting
- Budget is very limited
- No ductwork and adding it is impractical
- You only need cooling occasionally
The Middle Ground: Ductless Mini-Splits
If you need more than one room cooled but don't have ductwork, mini-splits offer: - Permanent, quiet installation - Multiple zones with independent control - No ductwork required - Higher efficiency than window units - More aesthetic than window units
Cost falls between window units and central AC.
Bay Area Perspective
Many older Bay Area homes lack AC entirely. Our mild climate means some homeowners get by with fans and occasional window units. But as we see more extreme heat events, many are adding cooling.
Evaluate: - How often do you actually need AC? - How many rooms need cooling? - Does your home have ductwork? - What's your budget?
The "right" choice depends on your specific situation.