Home Cooling
What You Need to Know About AC Replacement
March 22, 2026 · 9 min read
Key Takeaways
- A complete AC replacement in the GTA costs $4,500–$8,000 installed
- Installation day takes 4–8 hours for a standard swap
- Always replace the evaporator coil when replacing the condenser — mismatching voids warranties
- Get at least 3 written quotes and insist on a Manual J load calculation
Replacing your air conditioner is one of the largest home comfort investments you'll make. The equipment lasts 15+ years, affects your monthly energy bills, and determines how comfortable your home feels every summer. This guide covers what to expect at every stage — from deciding it's time to replace, through getting quotes, to what happens on installation day and beyond.
When to Replace vs. Repair
Not every AC problem requires a full replacement. But when the math tips toward replacement, delaying usually costs more. The key indicators:
- System is 12+ years old with declining performance
- Repair cost exceeds 50% of a new system's price
- System uses R-22 refrigerant (phased out in Canada)
- Multiple repairs in the same cooling season
- Energy bills rising despite consistent usage
For a detailed breakdown, see our article on 5 warning signs it's time to replace your AC.
What's Included in an AC Replacement
A complete AC replacement typically includes:
- Outdoor condenser unit — the large unit that sits outside your home
- Indoor evaporator coil — mounts on your furnace, should always be replaced with the condenser
- Refrigerant lines — new copper lines connecting indoor and outdoor components (reused only if in excellent condition)
- Thermostat — may be included or offered as an upgrade
- Concrete pad — replaced if the existing pad is cracked or unlevel
- Electrical disconnect — updated to current code if needed
- Permits — required in most GTA municipalities for HVAC equipment changes
AC Replacement Costs in the GTA (2026)
| System Level | SEER2 Range | Installed Cost |
|---|---|---|
| Entry (single-stage) | 14.3–15 | $4,500–$5,500 |
| Mid-range (two-stage) | 16–18 | $5,500–$7,000 |
| Premium (variable-speed) | 19–24 | $7,000–$10,000+ |
These prices include equipment, labour, materials, and standard permits. Additional costs may apply for electrical panel upgrades, ductwork modifications, or difficult access installations. Always get itemized quotes so you can compare apples to apples.
How to Choose a Contractor
The quality of installation matters as much as the equipment itself. A poorly installed premium system will underperform a well-installed mid-range one. Look for:
- TSSA registration — required for all gas work in Ontario, and a sign of legitimate operation for HVAC contractors generally
- Manual J load calculation — any contractor who sizes based on "square footage rules" is cutting corners
- Written warranty details — both manufacturer equipment warranty and installer labour warranty
- Itemized written quote — equipment model numbers, included components, permit costs, and any exclusions
- Insurance and WSIB coverage — protects you from liability during installation
Get at least three quotes. The lowest price isn't always the best value — compare what's included.
What to Expect on Installation Day
A standard AC replacement (same location, existing ductwork) follows this timeline:
- Morning arrival (8–9 AM): Crew protects floors and work areas, disconnects and removes the old system
- Mid-morning: New condenser pad poured (if needed), new condenser positioned, refrigerant lines run or replaced
- Early afternoon: Indoor evaporator coil installed, electrical connections made, refrigerant charged
- Late afternoon: System tested for proper operation — airflow, temperature differential (16–22°F across the coil), refrigerant pressures, and thermostat programming
- Cleanup and walkthrough: Crew cleans up, walks you through the new system's operation and maintenance requirements
Total time: 4–8 hours. You won't have AC during the installation, so plan accordingly during hot weather.
After Installation: First 30 Days
- Register your warranty — most manufacturers require online registration within 60–90 days to activate the full warranty period
- Check the filter — new installations can pull construction dust into the system; check the filter after 2 weeks
- Monitor performance — the system should maintain your setpoint within 1°C. Note any unusual sounds, cycling patterns, or humidity issues and report them within the warranty period
- Keep your paperwork — model numbers, serial numbers, warranty certificates, and the installer's contact information
Frequently Asked Questions
Can I finance an AC replacement?
Yes. Most HVAC contractors offer financing through partners like FinanceIt or Snap Financial. Typical terms are 0% for 12 months or low-interest plans over 5–10 years. H&C offers flexible financing options — ask about current promotions when you get your quote.
Do I need to replace the furnace at the same time?
Not necessarily. If your furnace is less than 10 years old and working well, you can replace just the AC (condenser + evaporator coil). If the furnace is 15+ years old, bundling both replacements often saves $500–$1,000 on combined labour costs and ensures the two components are properly matched for efficiency.
How long does a new AC warranty last?
Most major brands offer 10-year parts warranties when registered. Compressor warranties are sometimes longer (10–12 years). Labour warranties vary by installer — H&C provides a 2-year labour warranty standard, with extended options available. Always ask about both parts and labour coverage.
What's the best time to replace an AC?
Fall and early spring (October–April) offer the best pricing and scheduling flexibility. Summer is peak emergency replacement season — contractors are busiest, wait times are longest, and pricing is firmest. If you know your system is near end-of-life, plan the replacement during the off-season.
Ready to Get Started?
An AC replacement is a significant investment, but the right system installed correctly pays dividends in comfort, efficiency, and reliability for 15+ years. Request a free in-home quote or call 1-855-539-4328 to discuss your options with a licensed technician.