Air Conditioning Installation Cost Calculator

In 2026, installing air conditioning typically costs $3,000-$12,000, depending on the system type and home size. A central AC system for an average home commonly runs $4,000-$8,000 with existing ductwork, while adding all-new ductwork can push it to $10,000-$15,000+. Ductless mini-split systems run about $3,000-$10,000 depending on the number of zones, heat pumps $5,000-$12,000+ (since they also heat), and window or portable units are far cheaper at a few hundred dollars each. The main cost drivers are the system type, the cooling capacity needed (sized to your square footage), the efficiency rating, and whether ductwork must be installed.

AC capacity is measured in 'tons' (12,000 BTU each), and it must be matched to your space — an undersized unit won't keep up, while an oversized one short-cycles, wastes energy, and doesn't dehumidify well. A rough rule of thumb is about one ton of cooling per 400-600 square feet, so a 2,000 sq ft home often needs around 3.5-4 tons. However, proper sizing (a 'Manual J' load calculation) also accounts for climate, insulation, windows, ceiling height, and sun exposure, so a professional should confirm the size rather than relying on square footage alone. This calculator uses square footage to estimate the cost at typical sizing.

Central AC is a split system (outdoor condenser + indoor coil) that cools the whole home through ductwork — the standard choice for ducted homes. A ductless mini-split has an outdoor unit connected to one or more wall-mounted indoor heads, cooling specific zones without ducts — ideal for homes without ductwork, additions, or room-by-room control. A heat pump looks and installs like central AC or a mini-split but works in reverse in winter to also heat the home, making it an efficient all-in-one system (popular in mild and increasingly in cold climates). Central AC suits ducted homes; mini-splits suit ductless homes or zoning; heat pumps suit those who want cooling and heating in one system.

It depends on the system. Central AC requires ductwork to distribute cool air; if your home already has good ducts (for example, from a furnace), the AC can use them, keeping costs down. If there's no ductwork, installing it is a major expense (around $3/sq ft here) — which is why ductless mini-splits are popular for homes without ducts, since they deliver cooling directly through wall-mounted indoor units with no ducts at all. Window and portable units also need no ducts. So if you lack ductwork, a mini-split often costs less overall than central AC plus new ducts.

High-efficiency air conditioners (higher SEER2 ratings) cost more upfront — often 20-40% more — but use less electricity, lowering your cooling bills, and they typically run more quietly and provide better comfort and humidity control. Whether the premium pays off depends on your climate and usage: in hot regions where the AC runs heavily for months, the energy savings can recoup the extra cost over the system's life, and utility rebates or tax credits may offset the price. In mild climates with light AC use, a standard-efficiency unit may be the better value. Also consider that high-efficiency systems often come with longer warranties. A contractor can estimate the payback for your situation.

Replacing a central AC system that uses existing ductwork typically takes about 1 day (4-8 hours). A ductless mini-split with one or two zones is often a 1-day job; more zones take longer. Installing central AC in a home with no existing ductwork is a much bigger project — adding the ducts can take several days on top of the unit install. Heat pump installs are similar to the equivalent AC type. Window units are immediate. Permits and inspections (required for most permanent installs) and any electrical upgrades can add time. Most straightforward replacements are done in a single day, while new-ductwork or multi-zone projects span several days.

Often it makes sense to, especially for a central system. The AC's indoor coil sits on top of the furnace and they share the blower and ductwork, so if your furnace is also old, replacing both together saves on labor (one project instead of two), ensures the components are properly matched for efficiency, and avoids a second disruptive installation in a few years. Matched systems also tend to qualify for better efficiency ratings and rebates. If your furnace is relatively new and in good shape, you can replace just the AC. For homeowners weighing a full system, a combined furnace-and-AC (or a heat pump) replacement is worth pricing out alongside an AC-only install.

Yes, for permanent systems. Installing or replacing a central AC, mini-split, or heat pump typically requires a mechanical (HVAC) permit and often an electrical permit, plus inspection, because the work involves refrigerant, electrical connections, and equipment that must meet code. Handling refrigerant also requires EPA certification, so this is professional work. Permits ensure the system is correctly sized, wired, and installed safely. Window and portable units that simply plug in don't require permits. A licensed HVAC contractor pulls the necessary permits and arranges inspections as part of the installation — skipping permits can cause issues with warranties, insurance, and home sales.