When shopping for a new heat pump in the Durham Region, you’ll see plenty of acronyms like SEER2 and HSPF2. If these look like a different language to you, don't worry—you’re not alone.

Think of these ratings like the "liters per 100km" sticker on a new car. They tell you how much comfort you get for every dollar you spend on electricity. Here is the breakdown of what they mean and why they matter for your home.

1. What is a SEER Rating? (The Cooling Score)

SEER stands for Seasonal Energy Efficiency Ratio. It measures how efficiently your heat pump (or air conditioner) cools your home during a typical summer.

• How it works: It calculates the total cooling output over the entire summer divided by the total energy used.
• The Rule of Thumb: The higher the number, the more efficient the unit.
• 2026 Standards: Today, we use SEER2. This is an updated, more accurate version of the old SEER rating that accounts for the "real-world" air pressure found in home ductwork.
• What to look for: In Ontario, a SEER2 of 15 to 16 is considered standard efficiency, while premium units like the Lennox SL22V can reach 20+ SEER2.
• 
  

2. What is an HSPF Rating? (The Heating Score)

HSPF stands for Heating Seasonal Performance Factor. Since heat pumps both heat and cool, they need a separate rating for winter performance.

• How it works: It measures the total heat provided during the winter months compared to the electricity consumed.
• Why it's vital for Whitby: Because we live in a heating-dominated climate, your HSPF rating is actually more important for your wallet than your SEER rating.
• The New Metric: Just like cooling, we now use HSPF2. A high HSPF2 rating means the unit can keep you warm even when the temperature drops, without switching to expensive "backup" electric heat too early.
• What to look for: For a Cold-Climate Heat Pump, you typically want an HSPF2 of 8.5 or higher.

Why did the numbers change to SEER2 and HSPF2?

In 2023, the industry updated its testing procedures to better reflect how units actually perform once they are installed in a home. The new "2" ratings are more rigorous.

Important Note: Because the new test is "harder," a unit that was once rated 16 SEER might now be rated 15.2 SEER2. The equipment didn't get worse; the test just got more honest!

Which Rating Should You Prioritize?

If you are a homeowner in the Durham Region, prioritize the HSPF2 rating. Our winters are longer and more intense than our summers. A unit with a high heating efficiency will save you significantly more money over its 15-year lifespan than a unit that only focuses on high cooling efficiency.

Get an Efficiency Audit

Not sure which system fits your home’s ductwork and budget? The team at Walchuk Heating & Cooling can perform a load calculation to determine exactly which SEER2 and HSPF2 ratings will give you the best return on investment.

Contact Walchuk Heating & Cooling Today to find the perfect efficiency "sweet spot" for your home!