HVAC cost calculator · Full system
Furnace + AC Cost Calculator
Estimate the cost of replacing both your gas furnace and central air conditioner — sizing, efficiency, ductwork, and local labor included.
Average cost $8,000–$20,000
Quick Furnace + AC Estimate
Get a localized installation range in seconds — no signup required.
Advanced Furnace + AC Calculator
Personalize AC tonnage, furnace efficiency, ductwork, and upgrades for a complete HVAC replacement estimate.
What Is Furnace + AC?
Full system conditioning cools your entire home through a single outdoor condenser and indoor air handler connected to ductwork. A thermostat controls temperature room-by-room via supply vents.
- Whole-home cooling — one system, even temperatures
- Duct-driven airflow — works with existing furnace ducts in most homes
- Thermostat controlled — programmable and smart thermostat compatible
Furnace + AC Cost by Home Size
Installed averages at 16 SEER with existing ductwork — updates for your selected city.
| Home size | Avg installed cost | Typical tonnage |
|---|
Furnace + AC Cost by SEER Rating
Higher SEER costs more upfront but lowers monthly cooling bills.
| SEER | Avg cost | Energy savings |
|---|
Furnace + AC System Types
Furnace efficiency (AFUE) and AC SEER drive total installed cost.
Two-stage
Variable-speed
Furnace + AC Pros & Cons
Advantages
- Strong heating in cold winters
- Familiar technology for most contractors
- Whole-home comfort through existing ducts
- Can stage upgrades (furnace now, AC later) but combo often saves labor
Disadvantages
- Higher total cost than AC-only replacement
- Two fuel types if you also consider heat pumps later
- Requires well-maintained ductwork for both seasons
Furnace + AC vs Other Systems
Furnace + AC vs Heat Pump
Cooling-only vs heat + cool in one system — compare installed costs.
Read comparison →Furnace + AC vs Mini Split
Ducted whole-home vs ductless zoning — which fits your home?
Compare systems →Furnace + AC vs Window AC
Whole-home comfort vs room-by-room budget cooling.
Full HVAC calculator →HVAC Systems by Type
Compare installed cost ranges for every major system.
Local Furnace + AC Cost Factors
Based on the city selected in the calculator above.
National average
- Typical install: 3-ton · 16 SEER · existing ducts
- Peak season: Summer demand for AC replacements
- Sizing: ~1 ton per 500–600 sq ft (moderate climate)
- Note: Gas furnace + AC common in northern and midwestern markets
Your city
Furnace + AC Installation Timeline
System selection
1 day
Choose tonnage, SEER, and brand with your contractor.
Installation
1–2 days
Furnace swap, AC condenser, coil, flue checks, and full system test.
Duct adjustments
1–3 days
If needed — sealing, sizing, or partial replacement.
Inspection
Several hours
City permit inspection after install completes.
Best Furnace + AC Brands
Price tiers and typical warranty coverage (2026).
| Brand | Price tier | Typical warranty |
|---|---|---|
| Carrier | $$$ | 10 yr parts · 1–5 yr labor |
| Trane | $$$ | 10 yr parts · registered labor |
| Lennox | $$$ | 10 yr parts · variable by series |
| Goodman | $ | 10 yr parts · budget-friendly |
| Rheem | $$ | 10 yr parts · solid mid-range |
Real Furnace + AC Installation Examples
Based on the city selected in the calculator above.
National average
16 SEER AC + 80% furnace · 2,000 sq ft
- 3-ton · standard replacement
- Final cost: $9,200
Your city
16 SEER AC + 80% furnace · 2,000 sq ft
- 3-ton · existing ductwork
- Final cost: —
San Antonio, TX — Local Cost Context
Prices on this page adjust for San Antonio-area labor, permits, and climate — not a generic national template.
Labor
San Antonio offers some of the most affordable licensed labor among major Texas metros. Stucco and tile specialists are common, and military-family housing turnover keeps bath and flooring crews steady.
Contractor labor runs about 18% below the U.S. average; typical permit fees in our model start around $205 for standard residential work.
Permits
City of San Antonio Development Services issues building and mechanical permits. Northern suburbs like Schertz and Boerne maintain separate offices with shorter backlogs than coastal Texas cities.
Climate
South Texas heat with occasional hard freezes shapes material choices:
- Hot summers favor tile roofing and light-colored cool-roof coatings
- Occasional hard freezes require pipe insulation and HVAC freeze protection
- Limestone and clay soils affect fence post depth and patio prep
Top local projects
- Tile or composition roof replacement — Common on stucco homes built 1980s–2000s
- Master bath remodel — Walk-in showers popular with aging-in-place buyers
- Central AC upgrade — Affordable labor makes full changeouts attractive
Furnace + AC Cost FAQ
How much does Furnace + AC cost?
Furnace + AC installation typically costs $8,000–$20,000 nationally in 2026, depending on home size, tonnage, SEER, ductwork, and location. Use the calculator above for a localized range.
What size AC do I need?
Plan on about 1 ton per 500–600 sq ft in moderate climates — a 2,200 sq ft home often needs a 3–4 ton unit. Hot climates may need slightly more capacity. Always confirm with a Manual J load calculation.
Is 16 SEER worth it?
For most homes, 16 SEER is the sweet spot: modest upfront premium over 14 SEER with meaningful energy savings. In hot states like Texas or Arizona, payback is often under 7 years.
Does installation include ductwork?
Standard replacement usually reuses existing ducts. New ductwork adds roughly $2,800–$6,500+ depending on home size — toggle it in the advanced calculator.
How long does installation take?
Most central AC replacements take 1–2 days for installation, plus permit lead time. Duct work or electrical upgrades can extend the schedule to 3–5 days.