Your full system estimate
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A full system replaces furnace, condenser, and coil together. It costs more up front than AC only, but matched equipment runs more efficiently, carries a full warranty, and avoids a second install visit within a few years when an old furnace fails.
Most Austin gas homes in the 1,800 to 2,500 sq ft range land in the typical column.
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What full HVAC replacement usually costs in Austin
| Gas furnace + AC, 14.3-16 SEER2 | $7,500 - $12,500 (Typical $10,200) |
| Gas furnace + AC, variable speed, 17+ SEER2 | $10,000 - $14,500 (Typical $12,400) |
| Electric air handler + AC (no gas) | $7,000 - $11,800 (Typical $9,400) |
| Add-on: duct repair / zoning / IAQ | $800 - $4,500+ (Typical $1,800) |
Based on published Austin cost data. Updated October 15, 2026.
What drives the price in Austin
- Gas availability varies by neighborhood. All-electric homes in newer East and South Austin builds price differently. State which fuel the quote assumes.
- Austin Energy rebates apply on qualifying high-efficiency systems. Check Austin Energy for the current amount before you sign. Do not trust a hardcoded rebate figure.
- Winter is mild, so furnace sizing is rarely the cost driver. Cooling load is.
- Gas vs electric: gas furnace + AC typically $7,500-$12,500 at 14.3-16 SEER2. Electric air handler + AC typically $7,000-$11,800.
Permit and code note
Mechanical permit plus gas line inspection if the furnace is gas. City of Austin requires permit and inspection. If ductwork is replaced over a threshold, duct leakage testing may apply. Ask if the quote includes permit, inspection, and haul-away.
Austin example
Example: a 2,100 sq ft home in 78745 with a 4 ton gas system typically lands near $10,200, including equipment, labor, duct tweaks, permit, and haul-away.
Frequently asked questions
Gas vs electric?
Gas furnace plus AC is standard where gas is available. All-electric homes use an air handler plus AC. Heat pumps are the third option for mild winters.
Can I replace furnace and AC in different years?
Yes, but you lose the matched-system warranty and pay for two install visits. Doing both at once usually costs less overall.
What rebates apply?
Austin Energy rebates apply on qualifying high-efficiency systems. Check Austin Energy for the current amount before you sign. Do not trust a hardcoded rebate figure.
Sources
Ranges on this page come from published Austin cost guides (Angi Austin, Ja-Mar Austin 2026, Modernize, Texas Certified Restoration, AllBetter 2026). Estimates only, not quotes. Final price depends on size, access, and condition found on site.