Homebuyer HVAC Checklist

Key Takeaways

• HVAC replacement costs $5,000–$15,000+ — know what you're inheriting before closing
• Equipment age, maintenance history, and efficiency rating directly affect your operating costs
• Request service records and warranty documentation from the seller
• A pre-purchase HVAC inspection ($150–$250) can save thousands in unexpected repairs

A home's HVAC system represents $15,000–$30,000 in installed equipment. Replacement costs can blindside new homeowners who didn't assess the system before closing. Use this checklist during your home search and inspection process to evaluate what you're buying.

The Checklist

Furnace or Boiler

• ☐ Record manufacturer, model, and serial number (decode age from serial)
• ☐ Is it a standard (80% AFUE) or high-efficiency (90%+) furnace? High-efficiency units vent through PVC pipe; standard units vent through a metal chimney
• ☐ Check for rust, soot, or water stains around the unit
• ☐ Ask when it was last serviced — request service records
• ☐ If 15+ years old, budget $4,000–$7,000 for replacement within 5 years

Air Conditioner

• ☐ Record manufacturer, model, serial number, and tonnage (on the rating plate)
• ☐ Check the SEER rating — units below SEER 13 are outdated and inefficient
• ☐ Inspect the condenser pad — is the unit level? Is it rusting?
• ☐ If 12+ years old, budget $3,500–$6,500 for replacement within 5 years

Water Heater

• ☐ Tank or tankless? Record age and capacity
• ☐ Check for rust at the base (tank models) — rust means corrosion has started
• ☐ Is it rented or owned? Many Ontario water heaters are on rental contracts that transfer with the home — understand the terms and buyout cost
• ☐ If tank model is 8+ years old, budget $1,200–$2,500 for replacement

Ductwork

• ☐ Walk the basement and check for disconnected joints, holes, or excessive dust
• ☐ Is ductwork insulated in unconditioned spaces (attic, crawl space)?
• ☐ Are there signs of previous duct cleaning? If not, budget $300–$500
• ☐ Count supply registers — do all rooms have adequate coverage?

Thermostat and Controls

• ☐ What type? Manual, programmable, or smart?
• ☐ Test heating and cooling modes during the home inspection
• ☐ Are there multiple zones? Check that each thermostat controls its zone correctly

Questions to Ask the Seller

• When was each HVAC component last serviced? By whom?
• Are there any active warranties or service contracts?
• Is the water heater rented or owned? What are the rental terms?
• Has any major repair been done in the last 5 years?
• Are there any known issues with heating, cooling, or hot water?

Red Flags That Should Affect Your Offer

• Equipment over 20 years old: Budget for immediate replacement
• Mismatched components: A new furnace paired with a 15-year-old AC suggests the AC was skipped to save money — it's likely next to fail
• No maintenance records: Assume the system has been neglected
• Rental water heater with high buyout: Some contracts have buyout costs of $2,000+ — verify before you assume ownership
• Oversized or undersized equipment: An AC that short-cycles (runs briefly, shuts off, repeats) is likely oversized. A furnace that runs constantly in moderate weather is undersized

Frequently Asked Questions

Get a Pre-Purchase HVAC Assessment

Don't let HVAC costs surprise you after closing. Book a pre-purchase inspection or call 1-855-539-4328 — we'll give you an honest assessment of the system's condition and remaining lifespan.

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