Converting a radiator-based heating home to a forced-air central HVAC system typically costs between $8,500 and $28,000 depending on ductwork, furnace/AC size, and home layout. This article breaks down the conversion cost, per-unit pricing, major cost components, variables that change quotes, and practical ways to reduce the overall price.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Full conversion (furnace + AC + basic ducts) | $8,500 | $16,000 | $28,000 | Assumptions: 1,200–2,200 sq ft, suburban access, standard materials. |
| Furnace only (gas) | $3,200 | $5,500 | $9,000 | Includes heating-only install; per unit: one furnace |
| Air conditioner (split system) | $3,500 | $6,000 | $11,000 | Includes condenser + coil; sizes 2–4 tons |
| Ductwork (new) | $3,000 | $6,000 | $12,000 | Per sq ft: $4-$9 per sq ft typical |
What Buyers Pay To Replace Radiators With Central HVAC
Typical total price to convert radiators to central air ranges from $8,500-$28,000 for a full furnace and AC install with ducts; the average homeowner pays about $16,000. Assumptions: 1,500 sq ft, 80% AFUE furnace, 3-ton AC, moderate attic access.
If the house already has usable duct chase or partial ducting, expect the low end ($8,500-$12,000); if full new ducts and high-efficiency equipment are needed, expect $18,000-$28,000.
Cost Breakdown: Materials, Labor, Equipment, Permits
Major quote parts and typical share of the total price vary by home size and access.
| Materials | Labor | Equipment | Permits | Delivery/Disposal |
|---|---|---|---|---|
| $1,500-$6,000 (ducts, registers, insulation) | $2,000-$8,000 (installation crew) | $6,000-$14,000 (furnace + AC) | $150-$1,000 | $200-$800 |
Ductwork and equipment are typically the largest line items: equipment (40%-60%) and ducts (20%-30%) of total conversion cost.
How Ductwork Size, Runs, And Sq Ft Change The Quote
New ductwork cost depends on conditioned area and complexity: expect $4-$9 per sq ft for full new trunk-and-branch ducts. Example thresholds: under 1,200 sq ft often $3,000-$5,500; 1,200–2,500 sq ft $5,500-$10,500; over 3,000 sq ft $10,000+.
Long runs, multiple floors, or difficult soffit work can add $1,000-$4,000 extra; each additional 100 linear ft of duct can increase cost by roughly $200-$600 depending on material and access.
How Equipment Size And Efficiency Affect Price
AC and furnace sizing drives equipment pricing: typical residential AC is 2–4 tons (24,000–48,000 BTU). Budget ranges: 2-ton $3,500-$6,000; 3-ton $4,500-$8,000; 4-ton $6,000-$11,000. Furnaces: $3,200-$9,000 depending on AFUE and brand.
Choosing a higher-efficiency furnace (90%+ AFUE) or a high-SEER AC (16+ SEER) raises equipment cost by $1,000-$3,500 versus standard models.
Site Conditions And Permit Requirements That Change The Final Price
Historic homes, basement obstructions, or cities with strict mechanical codes increase labor and permit fees. Permits typically add $150-$1,000; required inspections or code upgrades can add $500-$3,500. Assumptions: urban permit regimes toward higher end.
If structural modifications or fire-stopping are required (common when adding ducts through floors), budget an extra $1,000-$5,000.
Three Real-World Quote Examples With Specs And Totals
| Scenario | Specs | Labor Hours | Total |
|---|---|---|---|
| Basic suburban split system | 1,400 sq ft, 3-ton AC, new simple ducts | 40-60 hours | $9,500-$12,500 |
| Medium remodel | 2,000 sq ft, 3.5-ton AC, full ducts, 90% furnace | 80-120 hours | $15,500-$20,500 |
| High-end changeover | 3,200 sq ft, 4-ton AC, custom zoning, high-efficiency gear | 120-200 hours | $24,000-$34,000 |
These examples show how square footage, equipment efficiency, and duct complexity push costs from about $10k to $30k+.
Practical Ways To Lower The Conversion Price
Reduce scope: reuse existing pipe chases for ducts, choose mid-efficiency equipment, or phase the work (furnace first, AC later). Get multiple bids and request line-item quotes to compare duct vs. equipment costs. Tip: consolidation of heating and cooling contractors can lower markup.
Simple actions—prepping attic access, removing wall finishes in work areas, and agreeing to weekday scheduling—can shave 5%-15% off labor-heavy quotes.
How Region And Season Influence Bids And Timing
Labor rates and demand vary: Northeast and West Coast prices are typically 10%-25% higher than Midwest rates. Summer installs for AC often have premium scheduling; off-season (spring/fall) can yield lower bids or faster scheduling. Estimate delta: urban coastal +15% vs. rural Midwest baseline.
Scheduling work in spring or fall and soliciting contractors during their slow season often produces better pricing and faster start dates.
