Converting a home with radiator heat (steam or hot-water) to a central air and forced-air HVAC system typically costs homeowners between $8,000 and $30,000 depending on ductwork needs, system size, and whether the boiler is replaced. This article gives realistic cost ranges, per-unit pricing, and the main drivers that determine the final price for a U.S. house.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Full Convert (2,000 sq ft) | $8,000 | $18,000 | $30,000 | Assumptions: Moderate ductwork, 3-ton AC, replace furnace/air handler. |
| Mini-Split Option | $4,000 | $9,500 | $20,000 | Assumptions: 2–4 zones, partial ductless solution. |
| Ductwork Only (add to boiler house) | $3,000 | $7,500 | $15,000 | Assumptions: 1,000–3,000 sq ft, average layout. |
Typical Total Price To Convert Radiator Homes To Central Air (By House Size)
Most U.S. buyers pay a total project price rather than per-radiator pricing: expect $8,000-$12,000 for small homes, $12,000-$22,000 for average suburban homes, and $22,000-$30,000+ for large or complex homes.
Average example: a 2,000 sq ft detached home with moderate duct runs and a new 3-ton AC/furnace package costs about $15,000-$20,000.
Assumptions: Midwest labor rates, typical ceiling/floor cavities, no major structural changes.
Cost Components: Materials, Labor, Equipment, Permits, Disposal
| Component | Low | Average | High | Notes |
|---|---|---|---|---|
| Equipment (AC + Furnace/Handler) | $3,000 | $6,500 | $12,000 | Per system; $3,500-$7,500 common for 2.5–3.5 ton. |
| Ductwork & Registers | $2,000 | $6,000 | $12,000 | Includes supply/return; depends on runs and complexity. |
| Labor (installation) | $1,500 | $4,000 | $8,000 | Typical $75-$125 per hour. |
| Electrical & Controls | $400 | $1,200 | $3,000 | Panel upgrades or new circuit for condenser. |
| Permits & Inspections | $100 | $350 | $1,000 | Local code dependent. |
| Delivery/Disposal | $100 | $400 | $1,200 | Old unit removal, refrigerant recovery. |
Material and equipment typically represent 50%-70% of the total; labor and ductwork are the next largest line items.
How Ductwork Size, House Layout, And AC Tonnage Change The Quote
Ductwork length, number of runs, and attic/ crawlspace access massively affect cost: 500-1,000 linear ft of new ducting is typical for 1,500–2,500 sq ft homes.
Numeric thresholds: under 1,200 sq ft often needs 1.5–2 tons; 1,200–2,000 sq ft typically 2–3 tons; over 2,000 sq ft commonly 3–5 tons.
Additional variables: floor-to-floor stack runs for multi-story homes, historic plaster walls (adds $2,000-$8,000), and long exterior condenser runs over 50 ft (adds $300-$1,200).
Practical Ways To Cut The Bill When Converting Radiators To Central Air
Opt for a staged approach: install a high-efficiency air handler and central AC first, then add ductless zones for remote rooms later. Reusing existing mechanical room space also saves labor.
Control choices that reduce cost: choose single-stage equipment vs. variable-speed, limit new duct runs, and avoid relocating walls or soffits.
Prepare the site by clearing attic/crawlspace access, moving stored items, and ensuring a 30-60 amp circuit is available to lower electrician time on site.
Regional Price Differences And What To Budget By Market
| Region | Typical Price Delta vs. National | Reason |
|---|---|---|
| Northeast | +10% to +30% | Older homes, tighter access, higher labor rates. |
| Midwest | -5% to +5% | Moderate labor, typical home layouts. |
| South | -5% to +10% | More duct-ready homes but higher AC demand. |
| West/Coastal | +10% to +40% | Higher labor and permit costs, seismic or energy codes. |
Expect the same scope to vary by roughly ±20% across U.S. regions; get local bids for accurate budgeting.
Real-World Quote Examples With Specs And Labor Hours
| Scenario | Specs | Labor Hours | Total |
|---|---|---|---|
| Simple Replace (townhouse, 1,200 sq ft) | 2-ton AC + minimal ductwork, attic runs | 24-36 hours | $8,000-$11,000 |
| Average Convert (single-family, 2,000 sq ft) | 3-ton AC + new duct system, attic+basement | 60-100 hours | $14,000-$20,000 |
| Complex (historic 3,500 sq ft) | 4.5-ton system, extensive patching, lift access | 120-200 hours | $25,000-$40,000 |
These examples reflect typical contractor crew sizes: 2–4 technicians for 1–3 day installs up to multi-week jobs for complex homes.