What Is a Good HSPF Rating for a Heat Pump?
HSPF is the number that tells you how efficiently a heat pump turns electricity into heat. Here's what a good HSPF rating looks like for an Oklahoma home, why HSPF2 numbers read lower, and how it works alongside SEER.
Fall is when heat pumps come up in conversation around the Oklahoma City metro. The weather turns, someone’s aging system finally gives out, and they start collecting replacement quotes. A call we get a lot this time of year goes something like: “Every proposal lists a different HSPF number, and one salesperson told me to get the highest one I can afford. What does that number actually mean, and how high do I really need to go?”
It’s a fair question, and the honest answer is that the biggest number isn’t automatically the right one. Here’s what HSPF measures, what a good rating looks like for a home in our climate, and why the number on a 2026 quote reads differently than the one on an older unit.
What HSPF actually measures
HSPF stands for Heating Seasonal Performance Factor. It’s the heat-pump equivalent of AFUE on a gas furnace or SEER on an air conditioner — a single number that rates efficiency over a whole heating season.
Specifically, it’s the total heat a unit delivers over the season divided by the total electricity it uses to do it. The higher the HSPF, the more warmth you get out of each unit of power. A heat pump is efficient in the first place because it moves existing heat from the outdoor air into your home rather than burning fuel to create it — HSPF just puts a number on how well a given model pulls that off across the mix of mild and cold days a season throws at it.
That “whole season” part is the key. HSPF isn’t a snapshot of one perfect day; it’s an average that accounts for the system working hard on cold mornings and coasting on mild afternoons.
What counts as a good rating
Here’s where it gets slippery, because the scale recently changed. The industry moved from the old HSPF standard to a newer one called HSPF2, and the two don’t read the same.
HSPF2 is measured under a tougher test that better reflects how equipment really runs once it’s installed in a home with real ductwork. Because the test is harder, the resulting numbers come out lower — roughly 10 to 15 percent below the old HSPF figure for the exact same unit. Nothing about the equipment got worse; the yardstick just got more honest.
In practical terms, for new equipment rated under HSPF2:
- Most quality residential heat pumps land somewhere around HSPF2 7.5 to 9.
- Premium variable-speed and high-end ductless mini-split systems climb higher still.
- The very efficient units carry the biggest price tags and the smallest everyday difference.
The one trap to avoid: don’t compare an old HSPF number from a brochure or an existing unit against a new HSPF2 number and conclude the new one is less efficient. Make sure you’re lining up HSPF2 against HSPF2, apples to apples.
HSPF and SEER: two numbers, one machine
A furnace only heats, so it carries one efficiency rating. A heat pump both heats and cools, so it carries two: HSPF2 for heating and SEER2 for cooling. Every heat pump quote you get should list both.
This matters more in Oklahoma than almost anywhere, because of how lopsided our seasons are. We run air conditioning hard from May into September and lean on heating for a comparatively short, mild winter. For most homes here, the system logs far more hours cooling than heating.
So while HSPF2 decides how economically you heat, the SEER2 number usually governs the larger slice of your annual energy use. When you’re weighing two heat pumps and one edges out the other on heating efficiency but trails on cooling, the cooling side often deserves the heavier vote in this climate. The right move is to look at both numbers together, not fixate on either one alone.
Does a higher HSPF pay off here?
Sometimes — but with real diminishing returns. Stepping up from a bare-minimum efficiency unit to a solid mid-range one is usually worth it: you’ll notice it on winter power bills, and the better systems tend to come with more comfortable variable-speed operation anyway. Pushing from an already-good rating to the absolute top tier is a much smaller payoff, and in our short heating season it can take a long time to earn back the premium through heating savings alone.
A few things move the needle more than chasing the last fraction of an HSPF point:
- Correct sizing. A heat pump matched to your home with a proper load calculation runs efficiently; an oversized or undersized one wastes its rating no matter how high it is.
- A sensible backup-heat setup. How the system hands off to auxiliary heat on cold snaps affects your real-world winter efficiency as much as the sticker number.
- Tight ducts and good insulation. A high-HSPF unit pushing heat through leaky ducts into a drafty house still loses efficiency the rating never sees.
- Annual maintenance. A dirty, low-charge, or poorly maintained system never delivers its rated efficiency.
If you’re sorting through replacement options this fall, the most useful thing isn’t memorizing efficiency tables — it’s having someone size the equipment to your actual home and show you what each tier realistically means for your comfort and your bills. Our heat pump installation and repair service starts with that load calculation and lays out the HSPF2 and SEER2 tradeoffs side by side, so you’re choosing on real numbers instead of sales pressure.
The bottom line
HSPF is the heat pump’s heating-efficiency score: higher means more warmth per unit of electricity, averaged across a whole season. For an Oklahoma home, a solid mid-range HSPF2 in the ballpark of 7.5 to 9 is plenty for most houses, and you rarely need the top-of-the-line number to come out ahead in our mild winters. Just remember that HSPF2 reads lower than the old HSPF scale for the same unit, that your heat pump is also rated for cooling with SEER2 — which carries more weight in our cooling-heavy climate — and that correct sizing, ductwork, and maintenance decide whether you ever actually see the efficiency you paid for.
If you’re comparing heat pumps or deciding whether one’s right for your home as the cold sets in across Edmond, Oklahoma City, and the surrounding metro, Graco can size it properly and walk you through the options — with flat-rate pricing you approve up front before any work begins. Call us at (405) 500-5333.
Frequently asked questions
- What is a good HSPF rating for a heat pump?
- For a new residential heat pump, most quality units land somewhere around HSPF2 7.5 to 9, with premium variable-speed and ductless systems climbing higher. Higher is more efficient — it means more heat delivered per unit of electricity. For Oklahoma's mild winters, a solid mid-range HSPF2 is plenty; you rarely need to chase the very top number to come out ahead.
- What's the difference between HSPF and HSPF2?
- They measure the same thing — heating efficiency over a season — but HSPF2 is the newer test standard that runs the equipment under tougher, more realistic conditions. Because of that, HSPF2 numbers read roughly 10 to 15 percent lower than the old HSPF figures for the same unit. So don't compare an old HSPF rating against a new HSPF2 one directly; make sure you're comparing HSPF2 to HSPF2.
- Does HSPF or SEER matter more in Oklahoma?
- Both matter, but our long, brutal summers mean your heat pump runs far more hours cooling than heating, so SEER2 (the cooling number) usually drives the bigger share of your yearly energy use. HSPF2 still counts — it decides how cheaply you heat through the winter — but if you have to prioritize, cooling efficiency carries more weight in this climate.