Choosing between central air conditioning and window units depends on your home size, budget, and cooling needs. Central AC is the right choice for whole-home cooling. Window units make sense for apartments, single rooms, or supplementing a whole-home system in hot spots.
Central AC: Whole-Home Cooling, Higher Upfront Cost
Central AC systems cost $3,500–7,500 installed for a new unit (more if ductwork needs to be added). A 3-ton system (typical for 1,500–2,000 sq ft) draws 3,000–4,000 watts. Annual operating cost to cool a 2,000 sq ft home in a moderate climate: $400–700. Modern central AC units achieve SEER2 ratings of 14–22+, with higher SEER units using significantly less electricity.
Window AC: Low Upfront, High Cost for Whole-Home Use
A single window AC unit (8,000–12,000 BTU) costs $150–400 and draws 700–1,200 watts. It effectively cools 300–550 sq ft. To cool a 2,000 sq ft home with window units would require 4–6 units drawing 3,500–6,000 watts combined — comparable to or higher wattage than central AC, with far more noise, less even distribution, and no dehumidification of the whole home. Window units make sense for: apartments where central AC isn't available, single rooms, or seasonal use in mild climates.
Portable AC: Flexible but Inefficient
Portable AC units cost $300–700 and cool one room without window installation. They're significantly less efficient than window units (higher EER numbers required for the same BTU output) and require a vent hose to exhaust hot air. Best for renters who can't install window units or situations where window installation isn't possible.
Cost Comparison: Annual Cooling Cost
- Central AC (2,000 sq ft, SEER 16): $450–600/year
- 4 window units (2,000 sq ft total): $550–750/year + higher noise and less comfort
- Mini-split (1–2 zones): $300–500/year — most efficient option for zone cooling