What drives the price
The equipment is roughly half the bill. The rest is refrigerant line work, a new line set or flush, electrical, a pad or brackets, permits, and the labour of two technicians for a day. Efficiency ratings drive the equipment cost more than tonnage does.
- SEER2 rating - a high-efficiency unit can add $2,000-$4,000
- Whether the air handler or furnace coil is replaced at the same time
- Ductwork condition - leaky ducts waste a new system and often get quoted alongside
- Attic or crawlspace air handlers add hours of labour
- Refrigerant type - older R-410A systems cannot simply be topped up any more
Should you DIY this or call a professional?
Call a pro, and there is no reasonable argument otherwise. Refrigerant handling requires EPA Section 608 certification, the electrical work needs a permit in nearly every jurisdiction, and an incorrectly charged system will run for a season and then fail in the way that voids the warranty. This is also the repair where getting several quotes matters most, because the spread between the cheapest and dearest honest quote on the same job is routinely $3,000.
Signs you need this repair
- System is 12-15+ years old and needs a second significant repair
- Repeated refrigerant leaks
- Compressor failure - often the moment replacement beats repair
- Rising bills with no change in usage
- Uneven cooling that persists after duct and airflow fixes
How to not get overcharged
Ask for the quote to separate equipment, labour, and any duct or electrical work. Then ask what the same installer would charge for one SEER2 tier lower - the efficiency upgrade often pays back over 12-15 years, which is longer than many people stay in the house. Late season, September onward, is when installers discount to keep crews busy.
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Red flags to watch for
- A quote given without anyone measuring the house or inspecting the ducts
- Pressure to replace when only the capacitor or contactor has failed
- Refusing to state the SEER2 rating and model number in writing
- A price that only holds if you sign today
Frequently asked questions
How much does it cost to replace an AC unit?+
A full central AC replacement typically runs $5,500-$12,000 installed, averaging around $8,000 for a 3-ton system. Replacing the outdoor condenser alone runs $3,500-$6,000.
Can I replace an AC unit myself, or should I hire a professional?+
Call a pro, and there is no reasonable argument otherwise. Refrigerant handling requires EPA Section 608 certification, the electrical work needs a permit in nearly every jurisdiction, and an incorrectly charged system will run for a season and then fail in the way that voids the warranty. This is also the repair where getting several quotes matters most, because the spread between the cheapest and dearest honest quote on the same job is routinely $3,000.
How long does it take to replace an AC unit?+
1-2 Days for a Full System, Most of One Day for a Condenser Swap. Scheduling and parts availability can extend the overall timeline beyond the hands-on work itself.
What makes the price of this job go up or down?+
SEER2 rating - a high-efficiency unit can add $2,000-$4,000. Whether the air handler or furnace coil is replaced at the same time. Ductwork condition - leaky ducts waste a new system and often get quoted alongside. Attic or crawlspace air handlers add hours of labour. Refrigerant type - older R-410A systems cannot simply be topped up any more.
How do I avoid being overcharged?+
Ask for the quote to separate equipment, labour, and any duct or electrical work. Then ask what the same installer would charge for one SEER2 tier lower - the efficiency upgrade often pays back over 12-15 years, which is longer than many people stay in the house. Late season, September onward, is when installers discount to keep crews busy.