The outdoor cooling unit — a central air conditioner or a heat pump. Like any major system it has a service life, and replacing one is a four- to five-figure cost most listings never mention.
$4,000–8,000 for central AC; $6,000–16,000 for a heat pumpAddress soonHeating-Cooling
Why it matters
Central AC typically lasts about 12–15 years, and heat pumps a similar span; past that, efficiency drops and a failure can come any summer. An older unit often uses the phased-out R-22 refrigerant, which is expensive to top up. Knowing the age lets you budget and negotiate — and if you plan to add a heat pump, it flags whether the electrical service can support it.
How to spot it
Read the manufacture date on the nameplate of the outdoor unit (often encoded in the serial number, or on a separate date sticker). Look for rust, a bent or dirty coil, and the refrigerant type. A unit that is loud, iced-up, or short-cycling is near the end of its life.
What it costs
Replacing central AC commonly runs about $4,000–8,000; a heat pump about $6,000–16,000 depending on size and type — often offset by federal or provincial rebates.
What to do
Note the age and factor a near-term replacement into your offer if the unit is aging. If you want a heat pump, confirm the electrical service and ducting suit it, and check current rebate programs before you budget.
Education and triage, not a home inspection. Casaroo reads the age and condition clues from your photos — an HVAC technician confirms the remaining life. We flag; we don't inspect.
Common questions
What is Aging air conditioner & heat pump?
The outdoor cooling unit — a central air conditioner or a heat pump. Like any major system it has a service life, and replacing one is a four- to five-figure cost most listings never mention.
Why does it matter for home buyers?
Central AC typically lasts about 12–15 years, and heat pumps a similar span; past that, efficiency drops and a failure can come any summer. An older unit often uses the phased-out R-22 refrigerant, which is expensive to top up. Knowing the age lets you budget and negotiate — and if you plan to add a heat pump, it flags whether the electrical service can support it.
How can I spot it?
Read the manufacture date on the nameplate of the outdoor unit (often encoded in the serial number, or on a separate date sticker). Look for rust, a bent or dirty coil, and the refrigerant type. A unit that is loud, iced-up, or short-cycling is near the end of its life.
How much does it cost to fix?
Replacing central AC commonly runs about $4,000–8,000; a heat pump about $6,000–16,000 depending on size and type — often offset by federal or provincial rebates.
Costs and rebates are 2026 estimates that change — confirm current programs and get a licensed HVAC quote.
Last reviewed 2026-07-02.
This guide is general education, not a home inspection and not advice for your specific property — always
consult the appropriate licensed professional, and get a licensed home inspection before you remove conditions
or buy. Cost ranges are 2026 estimates that vary by region, size, and access; confirm specifics with a
qualified professional.
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