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Understanding SEER & AFUE Ratings
SEER. AFUE. HSPF. You’ve seen these ratings on HVAC brochures — but what do they actually mean for your home and your wallet?
In this guide, we’ll explain what SEER (Seasonal Energy Efficiency Ratio) and AFUE (Annual Fuel Utilization Efficiency) really measure, and how they translate to energy savings, comfort, and system performance.
You’ll also learn why sizing and efficiency go hand-in-hand, and why a higher rating doesn’t always mean a better choice for Calgary’s unique climate.
HVAC Alphabet Soup, Decoded
Shopping for a furnace or AC and suddenly you're bombarded with acronyms: SEER, SEER2, AFUE. The numbers look important—but what do they actually mean?
These ratings aren't just marketing fluff. They directly affect how much you'll pay on your energy bills. Let's break it down in plain English, with real-world examples.
What is SEER (and SEER2)?
SEER = Seasonal Energy Efficiency Ratio
  • Think of it as "miles per gallon" for your AC or heat pump
  • Higher SEER = more cooling output per unit of electricity
SEER2: Newer 2023 standard with stricter testing. Numbers dropped slightly, but comparisons are apples-to-apples.
  • Old 13 SEER = New ~12.2 SEER2
  • Old 16 SEER = New ~15.2 SEER2
What is AFUE?
AFUE = Annual Fuel Utilization Efficiency
  • Measures furnace efficiency: how much gas actually turns into heat
  • 80% AFUE = 80¢ of every gas dollar heats your home, 20¢ goes up the chimney
  • 96% AFUE = only 4¢ wasted
Calgary tip: With long winters, AFUE ratings matter even more here than SEER.
Typical Ranges You'll See
AC/Heat Pumps (SEER2):
  • Entry-level: 13–14 SEER2
  • Mid-range: 15–17 SEER2
  • High-efficiency: 18–22+ SEER2
Furnaces (AFUE):
  • Standard: 80% (rarely installed new in Calgary due to code)
  • Mid-tier: 92–95%
  • Premium: 96–98%+
How Ratings Affect Bills
13%
Less energy used
A 16 SEER2 AC uses ~13% less energy than a 14 SEER2
$150
Annual AC savings
In Calgary, AC upgrades can save $50–$150/year
$600
Furnace savings
Upgrading from 80% to 96% AFUE can save $400–$600/year in gas
Air Conditioning (SEER2): In Calgary, AC isn't used as heavily as Toronto or Texas, but upgrades can still save $50–$150/year.
Furnaces (AFUE): Over 15 years, that's $6,000–$9,000—enough to pay for the upgrade itself.
Payback Calculations (Calgary Example)
Scenario: Family of 4, 1,800 sq ft home.
AC upgrade (14 → 16 SEER2):
  • Extra cost: ~$1,200
  • Annual savings: ~$100
  • Payback: ~12 years (borderline if you move sooner)
Furnace upgrade (80% → 96% AFUE):
  • Extra cost: ~$1,500
  • Annual savings: ~$500
  • Payback: ~3 years (no-brainer in Calgary)
Ratings Aren't Everything
A 96% AFUE furnace installed badly runs like an 80%. Efficiency ratings assume proper installation.
Ask contractors:
  • Do you test static pressure and airflow?
  • Do you size with Manual J, or just match old equipment?
  • Will you test combustion after install?
Common Myths & Other Ratings
1
"Higher SEER always pays off."
Not in Calgary. Short summers = long paybacks.
2
"80% furnaces are fine anywhere."
Maybe in Texas. Not in -30°C Alberta.
3
"Bigger is better."
Oversized equipment short cycles, wasting energy
Other Ratings to Know:
  • HSPF2: Heating Seasonal Performance Factor (for heat pumps)
  • EER: Efficiency at peak load—useful for hot climates, less relevant here
  • ENERGY STAR: North American efficiency certification
Calgary-Specific Takeaways & When to Call a Pro
01
Focus on AFUE upgrades—that's where the money is saved
02
AC SEER upgrades are nice, but don't blow the budget
03
If considering heat pumps, check HSPF2 and local rebates
04
Wildfire smoke? Efficiency plummets with dirty filters—change them often
Safe DIY Checks:
  • Replace filters regularly to maintain rated efficiency
  • Keep 2–3 ft clearance around outdoor AC/heat pump
  • Check thermostat settings seasonally
Stop there—leave performance testing to pros.
When to Call a Pro:
  • You're considering an upgrade and want ROI calculated
  • Bills are creeping up with no obvious reason
  • Furnace or AC seems to run nonstop
  • You're unsure if your system is oversized/undersized
Numbers That Really Matter: SEER and AFUE aren't just letters on a brochure. They're predictors of how much you'll pay in utility bills for years to come. In Calgary, AFUE is king—furnace efficiency has the biggest impact. SEER upgrades help, but only if you plan to stay long-term. Always balance ratings with proper installation and ROI math, and you'll make the right call for your comfort and your wallet.
Your Trusted HVAC Partner: HVACHELP.pro
At HVACHELP.pro, we are dedicated to empowering Calgary homeowners with the knowledge needed to navigate complex HVAC decisions. We cut through the technical jargon of SEER, AFUE, and other ratings, ensuring you understand not just what they mean, but how they directly impact your home's comfort and your monthly energy bills. Our goal is to equip you to make smart, informed upgrade decisions that are truly beneficial for your specific needs and Calgary's unique climate.

Visit HVACHELP.pro for expert HVAC advice, energy-saving guides, and real-world comparisons built specifically for Alberta homes.