Furnace and AC Replacement Cost Calculator: 3D HVAC System Estimator
Estimate exact installed pricing for a complete heating and cooling upgrade with our interactive 3D furnace and ac replacement cost calculator. Built as an all-in-one new hvac system cost calculator, air conditioner replacement cost calculator, and hvac system replacement cost calculator, this tool sizes your Manual J cooling tonnage and heating BTUs, models cased evaporator A-coil and condenser pairings in 3D, and runs the $5,000 Rule repair-vs-replace diagnostic. Use our hvac system cost calculator, hvac replacement cost calculator, and hvac installation cost calculator to compare bundled combo discounts against separate installations.
HVAC Replacement Scope, Manual J Load & Specs
Itemized HVAC Equipment, Labor & Mechanical Spec Breakdown
New HVAC System Cost Calculator: Comparing Efficiency Tiers & Replacement Scopes
Whether you are pricing a single component with an air conditioner replacement cost calculator or budgeting for a whole-house changeout with an hvac system replacement cost calculator, your total investment depends on staging technology (single-stage vs. two-stage vs. modulating inverter) and whether you bundle the indoor furnace and outdoor condenser together. Review the live pricing matrix below generated by our hvac installation cost calculator for your selected home square footage:
| HVAC System Efficiency Tier | Furnace Only (2,000 sf) | AC + Coil Only (3.5 Ton) | Full Furnace + AC Combo | Bundled Combo Savings | Comfort & Venting Profile |
|---|---|---|---|---|---|
| Standard Single-Stage (14.3 SEER2 / 80% AFUE) | $4,420 | $5,680 | $8,450 | Save $1,650 | Metal B-vent chimney flue; 100% single-speed output |
| Mid-Eff Two-Stage (16 SEER2 / 92% AFUE) | $5,480 | $6,950 | $10,480 | Save $1,950 | PVC sidewall flue; 65%/100% two-stage quiet operation |
| High-Eff Condensing (18 SEER2 / 96% AFUE) | $6,450 | $8,290 | $12,440 | Save $2,300 | Sealed 2-pipe PVC combustion; variable ECM blower motor |
| Variable Inverter (21 SEER2 / 98% Modulating) | $7,820 | $10,180 | $15,250 | Save $2,750 | 1% increments from 40%–100% capacity; pinpoint humidity control |
Before finalizing your contractor quote with our hvac replacement cost calculator, make sure your supply and return air trunks can handle the required CFM airflow and compare reliability across major equipment manufacturers:
1. Inspect & Price Air Duct Trunk Capacity
Putting a high-efficiency variable-speed blower onto leaky or undersized air ducts wastes up to 30% of your conditioned air. Estimate sheet-metal trunk and R-8 flex branch upgrades using our Ductwork Replacement Cost Calculator.
2. Lifetime Unit-Replacement Heat Exchanger Warranties
Looking for a mid-priced condensing gas furnace and central AC split system backed by lifetime compressor and stainless-steel tubular heat exchanger coverage? Read our in-depth Amana HVAC Reviews.
3. Inverter Heat Pump & Condenser Showdown
Trying to decide between variable-speed inverter technology and traditional Greenspeed or Infinity split systems? Compare equipment pricing, SEER2 ratings, and parts availability in our Daikin vs Carrier comparison.
4. Mid-Range Value vs. Premium Dealer Equipment
Weighing Classic Series furnaces and condensers against Evolution and Preferred two-stage units? See real contractor installation costs and decibel ratings in our Rheem vs Bryant guide.
Frequently Asked Questions About Furnace and AC Replacement Costs
How much does it cost to replace a furnace and AC together? +
- Standard Single-Stage Combo (14.3 SEER2 AC + 80% AFUE Furnace): $7,500 to $9,400 installed.
- Mid-Efficiency Two-Stage Combo (16 SEER2 AC + 92%–96% AFUE Furnace): $9,500 to $12,800 installed.
- High-Efficiency Variable-Speed Inverter Combo (18–21 SEER2 + 98% Modulating Furnace): $13,200 to $17,500+ installed.
What is the $5000 rule for HVAC? +
- If the total exceeds $5,000: Replacing the HVAC unit is more cost-effective than repairing it. For example, if your 14-year-old air conditioner needs a $650 blower motor or capacitor/contactor overhaul (
14 × $650 = $9,100), you should replace the system rather than sinking money into aging components near the end of their service life. - If the total is under $5,000: Repairing the system usually makes financial sense (for example, a 6-year-old unit needing a $450 repair equals
$2,700), provided the heat exchanger and compressor are still under manufacturer warranty.
Is it cheaper to replace AC and furnace at the same time? +
- Sheet-Metal Plenum & Evaporator Coil Transition Labor: Since the AC evaporator A-coil sits directly on top of the furnace supply outlet, replacing the furnace later requires disconnecting, evacuating, and re-brazing the AC coil all over again.
- Matched AHRI Blower & SEER2 Performance: A new high-SEER2 air conditioner requires a variable-speed ECM furnace blower motor to achieve its rated efficiency and dehumidification.
- Single Permit, Equipment Delivery & Wholesale Bundle Rebates: HVAC distributors and utilities offer their highest instant rebates when installing an AHRI-matched furnace and condenser combo.
How much does it cost to replace a furnace for a 2000 sq ft house? +
- 80% AFUE Single-Stage Gas Furnace (80,000 BTU): $4,100 to $5,100 installed (uses existing metal B-vent flue pipe).
- 92% to 96% AFUE Two-Stage Condensing Gas Furnace (80,000 BTU): $5,300 to $6,700 installed (includes 2-pipe PVC sidewall venting and condensate drain line).
- 98% AFUE Variable-Speed Modulating Gas Furnace (80,000 BTU): $6,800 to $8,100 installed.
- Electric Furnace / Modular Air Handler (15 kW – 20 kW): $3,600 to $5,400 installed.