HVAC Installation Cost Calculator

A complete HVAC system typically runs $7,000 to $16,000 installed, with most homeowners paying $8,000 to $13,000. A standard central AC plus gas furnace for an average home is about $8,000–$12,000, a heat pump $9,000–$14,000, a dual-fuel system more, and ductless mini-splits $4,000–$15,000 depending on the number of zones. The biggest variables are the system type, your home's size (which sets capacity), the efficiency tier (high-efficiency adds about 30%), and whether you need new ductwork. Use the calculator above to compare system types and price your specific project by size, efficiency, and ducts.

This calculator estimates a complete HVAC system — the full heating and cooling system together — which fits new construction, a first central system, or replacing an entire aging setup at once, and it lets you compare whole system types (central AC + furnace, heat pump, dual-fuel, mini-split, package unit). If you're only swapping an existing furnace and/or AC where ductwork and infrastructure are already in place, a component-specific replacement estimate fits better; if you just need cooling, an AC-installation estimate is more focused. The overlap is real — the difference is scope (whole system vs. one component) and whether you're starting fresh or swapping into existing infrastructure.

Sizing shouldn't be guessed. As a rough rule, you need about 1 ton of cooling per 500–600 sq ft, so a 2,000 sq ft home usually needs a 3.5-to-4-ton system — but that's just a starting estimate. The correct method is a professional Manual J load calculation, which accounts for your insulation, windows, ceiling heights, air leakage, and climate. Right-sizing matters: an oversized system short-cycles (wasting energy, wearing out, and leaving humidity), while an undersized one runs constantly and can't keep up on extreme days. Don't just copy the old system's size — it may have been wrong. Use square footage to budget, but rely on a contractor's load calc for the system you actually buy.

It depends on your climate and energy costs. A central AC plus gas furnace cools with electricity and heats by burning gas — proven, strong heat for cold climates, and often cheaper to run for heating where gas is inexpensive. A heat pump is all-electric and both heats and cools by moving heat; it's very efficient, increasingly capable in cold weather (especially cold-climate models), and ideal in mild-to-moderate climates or if you want to electrify — plus it qualifies for many rebates and tax credits. A dual-fuel system pairs a heat pump with a gas furnace that kicks in when it's very cold — the best of both for cold climates that still want heat-pump efficiency most of the year. The calculator lets you compare all of these.

Ductwork distributes conditioned air through your home, and installing it is labor-intensive and invasive. If you have ducts in good shape, a new system just connects to them and costs stay down. But all-new ductwork — in new construction, an addition, or an older home that never had central air — means running ducts through walls, ceilings, attics, and crawl spaces, plus cutting and patching finished surfaces, which can add several thousand dollars (the calculator adds about $4 per square foot). Leaky or undersized existing ducts may need sealing or partial replacement too. This is also why ductless mini-splits are attractive for homes without ducts — they skip ductwork entirely. In the calculator, ductwork is a selection: reuse existing or add new.

High-efficiency equipment costs about 30% more upfront but can pay off through lower bills, depending on your climate, energy prices, and how long you'll stay. Efficiency is rated by SEER2 (cooling) and AFUE or HSPF (heating) — higher numbers mean less energy for the same comfort. In hot or cold climates where the system runs a lot, the savings recoup the premium faster; in mild climates with light use, standard efficiency may make more sense. Crucially, high-efficiency systems (especially heat pumps) often qualify for utility rebates and federal tax credits that offset much of the premium, sometimes making them the clear winner. They also tend to run quieter with better humidity control. The calculator lets you compare both tiers.

Almost always, yes. HVAC installation involves electrical work, gas lines, refrigerant handling, and energy-code compliance, so building departments require a permit and inspection to confirm the work is safe and correct. A licensed contractor typically pulls the permit and handles the inspection. Permits protect you — they ensure the system is properly sized, installed to code, and safe, which matters for warranty validity, insurance, and resale (unpermitted HVAC work causes problems when you sell). Refrigerant handling also requires EPA-certified technicians. Skipping the permit risks safety hazards, failed inspections, voided warranties, and resale issues, and the permit cost is a small fraction of the project. It's a selectable line item in the calculator.

A standard full system changeout where ductwork already exists usually takes 1 to 3 days, and many straightforward jobs finish in a day or two. The work includes removing old equipment, setting the new outdoor and indoor units, connecting refrigerant lines, electrical, and gas, installing the thermostat, and testing and commissioning. Jobs needing new ductwork take considerably longer — several days to a week or more — because running ducts is invasive and may involve opening and patching walls. Mini-split timelines depend on the number of zones (one zone in a day, multi-zone longer). Zoning and air-purification add-ons add time, and permitting/inspection may add a step. Most homeowners are without heating or cooling only briefly during a same-day or two-day changeout.

Quite a few, especially for efficient electric equipment. Federal tax credits reward qualifying high-efficiency heat pumps, central AC, and furnaces, and heat pumps in particular can earn a substantial credit. Many utilities and states add their own rebates for high-SEER systems and heat pumps, and income-based programs can cover a large share of a heat-pump upgrade. These incentives can meaningfully close the gap between standard and high-efficiency equipment — sometimes making the efficient option cheaper after incentives. To claim them you'll usually need the equipment to meet specific efficiency thresholds and to keep documentation, so ask your contractor which models qualify and check your utility's current programs before choosing your system.

Most central HVAC equipment lasts 15 to 20 years with regular maintenance — air conditioners and heat pumps around 12–17 years, gas furnaces often 15–25. Consider replacement when the system needs frequent or expensive repairs, is more than 15 years old, uses obsolete R-22 refrigerant, or when energy bills climb as efficiency drops. A common rule: if a repair costs more than about a third of a new system and the unit is past its prime, replacement is usually the better investment — new equipment is far more efficient and comes with a fresh warranty. Replacing a full system before it fails also lets you plan the purchase, capture rebates, and avoid an emergency changeout in peak season.