Heat Pump Running Costs in 2026: The Real Monthly Math

The One Formula That Governs Everything

Forget every rule of thumb you’ve read. A heat pump’s running cost comes down to one equation:

Monthly cost = kWh used × your $/kWh rate

And the kWh used comes from a second equation:

kWh = (heat your home needs, in kWh) ÷ (heat pump efficiency, COP)

That’s it. Everything in this guide — the climate tables, the state scenarios, the gas-furnace duel — is these two equations with different inputs. Once you can run them, you can price any scenario in 60 seconds.

A worked example, with every step shown. Take a 2,000 sq ft home in a moderate climate (think North Carolina or Tennessee) that needs about 50 million BTU of heat over a heating season — written 50 MMBtu, the unit energy analysts use. First convert heat to kWh: 1 kWh of heat equals 3,412 BTU, so 50,000,000 ÷ 3,412 = 14,654 kWh of heat the house needs. A mid-efficiency heat pump delivers about 2.9 units of heat per unit of electricity over a season (we’ll explain where 2.9 comes from shortly), so the electricity required is 14,654 ÷ 2.9 = 5,053 kWh. At the 2026 national average residential rate of $0.18/kWh (EIA, August 2026): 5,053 × $0.18 = $910 per heating season, or about $152/month across a six-month heating season.

Notice what just happened: the arithmetic is trivial, but the inputs — how much heat your home needs, your system’s seasonal efficiency, your rate — are where the real expertise lives. The rest of this guide is about getting those three inputs right.

One more thing the formula reveals: because a heat pump moves heat rather than making it, the same $0.18 of electricity buys you roughly three times the warmth it would buy in baseboard heaters. That multiplier — the COP — is the entire economic case for heat pumps, and it’s also the thing most cost articles explain badly. We’ll fix that next.

What a Heat Pump Actually Draws While Running

Ask “how many watts does a heat pump use?” and you’ll get answers ranging from 1,500 to 15,000 watts — because people are describing different machines doing different things. Here’s the honest breakdown.

The compressor and fans: 2–5 kW. A typical 2.5–3.5 ton residential heat pump draws roughly 3–5 kW while actively heating — that’s the compressor outside plus the indoor blower. At the national average $0.18/kWh, that’s $0.54–$0.90 per hour of runtime. A 3-ton system running at a moderate 3.5 kW costs about $0.63/hour. This is the number that should be in your head: sixty-ish cents an hour at average rates.

Inverter (variable-speed) models draw less, longer. This confuses people. An old single-stage heat pump is either fully on (drawing its full 4 kW) or off. A modern inverter-driven unit ramps down to 30–40% capacity on mild days, drawing maybe 1.2–1.8 kW — but it runs for many more hours. Total energy used is lower because it avoids the inefficient stop-start cycling, even though the “hours run” number on your thermostat looks alarming. Long runtimes on an inverter system are a sign of efficiency, not a problem. If your installer told you “it runs all the time, that’s normal” — they’re right, for inverter equipment.

Defrost cycles: real, but small. In heating mode, the outdoor coil periodically frosts up, and the system briefly reverses to melt it — sometimes engaging a small amount of backup heat so you don’t feel a cold blast. Demand-defrost controls (standard on modern units) only defrost when sensors detect frost, and the energy penalty is roughly 2–5% of seasonal heating energy. It’s already baked into the seasonal efficiency ratings we’ll discuss next, so don’t add it separately.

Standby power: pennies. The outdoor unit’s crankcase heater and controls draw a few dozen watts when idle — a few dollars a month at most. Not worth optimizing; not worth worrying about.

The strips: 5–20 kW, and this is where bills explode. Electric-resistance backup heat (auxiliary/emergency heat) comes in 5 kW increments — 5, 10, 15, or 20 kW packages are standard, sized to carry the home if the heat pump can’t. A 10 kW strip package — the most common size on a 3-ton system — draws 10 kW, which at $0.18/kWh is $1.80 per hour. Your heat pump plus strips running together (14 kW total) costs $2.52/hour — roughly four times the heat pump alone. A 15–20 kW package, common on larger systems, can add $500–$800+ to a monthly bill if it runs constantly. We’ll devote an entire section to this trap, because it is the #1 cause of “my heat pump bill is insane” stories.

COP and HSPF2, Explained Without the Jargon

Two ratings describe heat pump heating efficiency, and you need to understand both — briefly.

COP (Coefficient of Performance) is the instantaneous multiplier: a COP of 3.0 means 1 kWh of electricity becomes 3 kWh of heat. It changes with outdoor temperature — a balmy 50°F day might give COP 4.5; a brutal 10°F night might give COP 2.0. This is physics: there’s simply less heat in colder air to move.

HSPF2 (Heating Seasonal Performance Factor) is the season-long average, measured in BTU of heat per watt-hour of electricity under the DOE’s 2023 test procedure. Divide HSPF2 by 3.412 to get the seasonal-average COP. The math: a unit rated 7.8 HSPF2 has a seasonal COP of 7.8 ÷ 3.412 = 2.29. A premium cold-climate unit at 10 HSPF2 averages 2.93.

The benchmarks that matter in 2026:

(DOE, 2023 standards; ENERGY STAR criteria. Packaged systems have slightly lower minimums — 6.7 HSPF2.)

Two practical takeaways. First, when an article says “heat pumps are 300% efficient,” it’s quoting a mild-weather COP of 3.0 — your seasonal average in a cold climate will be lower, around 2.3–2.9. Use seasonal numbers for money math, not brochure COPs. Second, the jump from a 7.5 to a 10 HSPF2 unit cuts heating electricity by roughly 25% (2.20 vs 2.93 COP) — meaningful, but your electricity rate still matters more than the rating. A 10 HSPF2 unit at California rates costs more to run than a 7.5 unit at Texas rates.

For cooling, the analogous rating is SEER2 (federal minimum 14.3 in the South, 13.4 in the North as of 2023). Cooling math works the same way: a 15.2 SEER2 system has a seasonal cooling COP of about 4.45 — air conditioning is inherently efficient because the temperature lift is small.

Monthly Running Cost by Climate: Three Worked Scenarios

Here’s the formula applied to three representative homes — each 2,000 sq ft with average insulation, each with a sensibly matched heat pump. Every number shows its arithmetic, and every assumption is stated, so you can swap in your own figures.

Assumptions (stated explicitly): 2,000 sq ft home, average insulation and air sealing; heat demand of 25 / 50 / 75 MMBtu per heating season for mild / moderate / cold climates (consistent with DOE climate-zone heating loads of roughly 15–20, 25–35, and 45–55 BTU per sq ft at design conditions); seasonal COPs of 3.2 / 2.9 / 2.5 reflecting milder weather and less aux-heat use in warm zones; electricity at the 2026 national average of $0.18/kWh (EIA, August 2026); cooling loads of 2,500 / 1,200 / 600 kWh per year (Florida/Texas homes cool far more than Minnesota homes).

Scenario A — Mild climate (Dallas, Atlanta, Phoenix): heating is a side quest. Heat needed: 25 MMBtu = 25,000,000 ÷ 3,412 = 7,327 kWh of heat. Electricity: 7,327 ÷ 3.2 = 2,290 kWh. Cost: 2,290 × $0.18 = $412 per heating season. Spread over a ~4-month heating season: ~$103/month in heating months. Cooling dominates here: 2,500 kWh × $0.18 = $450/year for cooling. Total: $862/year, or ~$72/month annualized.

Scenario B — Moderate climate (North Carolina, Tennessee, Virginia): the balanced case. Heat needed: 50 MMBtu = 14,654 kWh of heat. Electricity: 14,654 ÷ 2.9 = 5,053 kWh. Cost: 5,053 × $0.18 = $910 per heating season, or ~$152/month across six heating months. Cooling: 1,200 kWh × $0.18 = $216/year. Total: $1,126/year, or ~$94/month annualized.

Scenario C — Cold climate (Chicago, Boston, Minneapolis): heating is the whole game. Heat needed: 75 MMBtu = 21,980 kWh of heat. Electricity: 21,980 ÷ 2.5 = 8,792 kWh. Cost: 8,792 × $0.18 = $1,583 per heating season, or ~$226/month across seven heating months. Cooling is minor: 600 kWh × $0.18 = $108/year. Total: $1,691/year, or ~$141/month annualized.

The pattern to internalize: your climate sets the kWh, your rate sets the dollars. A cold-climate home uses roughly 4x the heating electricity of a mild-climate home — but move either home from a $0.13 state to a $0.30 state and the bill more than doubles without a single extra kWh. Which brings us to the table that matters most.

Same House, Different State: The Rate Scenario Table

Take Scenario B’s house — 2,000 sq ft, moderate climate, 5,053 kWh of heating electricity plus 1,200 kWh of cooling, 6,253 kWh total for the heat pump — and price it at real 2026 state rates (EIA, 2026 monthly data):

Same equipment. Same house. Same weather. The Hawaii homeowner pays 3.7x what the Louisiana homeowner pays. This is why every national “average heat pump cost” article is nearly useless without your rate — and why the first thing this guide asked you to do was check your bill.

A note on what “your rate” means: use the all-in rate from your bill — total dollars divided by total kWh, including delivery charges, taxes, and fees. The advertised generation rate understates your true cost by 30–50% in many states. EIA’s state averages are computed exactly this way (revenue ÷ sales), which is why they’re the right benchmark.

Time-of-use rates deserve a paragraph. Many utilities now offer plans with cheaper overnight electricity — commonly 20–50% below the standard rate during off-peak hours. A heat pump is an ideal load to shift: pre-heat the house a degree or two before the morning peak, coast through expensive hours. Real example: PG&E’s E-ELEC plan (for homes using a heat pump as primary heat) charges about $0.285/kWh off-peak vs $0.321/kWh peak in winter 2026 — a modest ~11% spread, but some municipal utilities offer far wider ones. If your utility has a TOU option, model your heat pump’s cost at the off-peak rate for the hours it actually runs — winter heating runs disproportionately overnight, which is exactly when off-peak pricing applies.

A Full Year, Month by Month

Annual averages hide the reality that heat pump costs are violently seasonal. Here’s Scenario B’s house (moderate climate, $0.18/kWh) broken into months, using a typical heating-load distribution (January heaviest, shoulder months light) — the shape your own bills will follow even if the totals differ:

Two things jump out. First, December and January together are nearly a third of the annual cost — if you’re budgeting monthly, budget for the peak, not the average. Second, this table assumes no excessive auxiliary heat. In the real world, January’s number is where aux strips do their damage: 100 hours of 10 kW strip runtime in a cold month adds 1,000 kWh — $180 extra — on top of what’s shown. That’s the difference between a $209 December and a $389 December, and it’s the most common reason heat pump owners report “shocking” winter bills.

Cooling Season: The Other Half of Running Cost

Heating dominates this guide because heating dominates the bill — but in the Sun Belt, cooling is the bigger number, and the math works the same way with one substitution: SEER2 instead of HSPF2.

A 15.2 SEER2 system delivers 15,200 BTU per kWh, i.e., a seasonal cooling COP of 15.2 ÷ 3.412 = 4.45. Cooling is inherently efficient because the temperature “lift” is small — you’re moving heat from 75°F indoors to 95°F outdoors, not from 75°F to 10°F. The formula: cooling kWh = cooling load (BTU) ÷ (SEER2 × 1,000).

Worked example — a 2,000 sq ft Dallas home with a 38 MMBtu annual cooling load (about 1,050 equivalent full-load hours on a 3-ton system, typical for North Texas): 38,000,000 ÷ (15.2 × 1,000) = 2,500 kWh of cooling electricity per year. At $0.18/kWh: $450/year, or about $113/month across a four-month cooling season. Per unit of cooling: ($0.18 × 293.07) ÷ 4.45 = $11.85 per MMBtu — roughly a third cheaper than the same system’s heating cost per MMBtu, which is why heat pumps are such easy winners against straight electric cooling.

Two cooling-specific notes. First, humidity is a hidden cost: in humid climates the system runs longer to wring moisture from the air, and an oversized unit short-cycles — cooling quickly but shutting off before dehumidifying, leaving you clammy at 72°F and tempted to set 68°F. Right-sizing (Manual J) saves cooling money the same way it saves heating money. Second, don’t compare your summer heat-pump bill to a neighbor’s window units — compare it to what central AC cost you before, because a heat pump in cooling mode is central AC at the same SEER2 rating. If your summer bills rose after switching, the cause is almost never cooling efficiency; it’s the winter heating load now sitting on the electric bill, or rate changes.

Heat Pump vs Gas Furnace: The Per-Month Running-Cost Duel

This is the comparison that actually decides purchases — and the one most articles fumble by comparing equipment prices instead of fuel prices. Running cost is a fuel-price question, so let’s do it in the only fair unit: dollars per million BTU of heat delivered into the house.

The formulas: – Heat pump: $/MMBtu = (electricity rate × 293.07) ÷ COP. (293.07 is the kWh in one MMBtu.) – Gas furnace: $/MMBtu = (gas price per therm × 10) ÷ AFUE. (10 therms per MMBtu; AFUE is the furnace’s efficiency.)

At 2026 national averages — electricity $0.18/kWh, natural gas ~$1.47/therm (EIA residential data), heat pump seasonal COP 2.9, furnace 95% AFUE: – Heat pump: ($0.18 × 293.07) ÷ 2.9 = $52.75 ÷ 2.9 = $18.19 per MMBtu – Gas furnace: ($1.47 × 10) ÷ 0.95 = $14.70 ÷ 0.95 = $15.47 per MMBtu

So at national-average prices, a 95% gas furnace is modestly cheaper to run than a mid-efficiency heat pump — about 15% less per unit of heat. For our 50 MMBtu moderate-climate home: the heat pump costs $910/season in heating; the gas furnace burns 526 therms (50 × 10 ÷ 0.95) × $1.47 = $774/season. Gas wins by ~$136/year on heating alone.

But “national average” describes nobody’s house. Run the same math at local prices and the winner flips constantly:

The honest summary: in 2026, gas furnaces usually win on pure heating running cost where gas is cheap and electricity is average-or-expensive; heat pumps win where electricity is cheap, gas is expensive, or the heat pump is a high-efficiency cold-climate model. And the heat pump has a structural advantage the table doesn’t show: it also cools. A gas furnace needs a separate air conditioner ($5,000–$12,000 installed, plus its own running cost), while the heat pump’s cooling cost is already in our numbers. For total HVAC running cost — heating plus cooling — the heat pump wins in far more scenarios. Our full heat pump vs furnace cost comparison covers the 10-year total including equipment.

One more 2026-specific note: the EIA’s Winter Fuels Outlook (October 2026) projects average household heating-season spending of $640 for natural gas vs $1,196 for electric heat — but that “electric heat” figure blends heat pumps with far pricier resistance heat, and it reflects average equipment, not a new high-efficiency heat pump. Don’t read it as “gas is half the cost of a heat pump”; read it as context.

The Break-Even Formula (Bookmark This)

You can skip the tables forever with one equation. A heat pump ties a 95% gas furnace when:

Your electricity rate ($/kWh) = gas price ($/therm) × COP × 0.0359

(derived: set the two $/MMBtu formulas equal and solve. The 0.0359 = 10 ÷ (0.95 × 293.07).)

Worked examples — if your electricity rate is below the result, the heat pump is cheaper to run; above it, gas wins: – Gas at $1.47/therm, standard heat pump (COP 2.9): 1.47 × 2.9 × 0.0359 = $0.153/kWh. Below ~15.3¢, the heat pump wins; above it, gas wins. At the $0.18 national average, gas wins — consistent with the table above. – Same gas price, cold-climate heat pump (COP 3.4): 1.47 × 3.4 × 0.0359 = $0.179/kWh — essentially the national average rate. This is why equipment efficiency matters: the better unit ties gas at typical rates.

Plug in your actual gas price (from your bill, per therm, all-in) and your heat pump’s seasonal COP (HSPF2 ÷ 3.412), and you have your personal answer in ten seconds. No article’s national average can do this for you.

Against Oil, Propane, and Electric Resistance: No Contest

Gas is the heat pump’s only real running-cost rival. Against everything else, the math isn’t close — which is why fuel-switching from oil or propane to a heat pump is one of the highest-ROI energy moves a homeowner can make. Same 50 MMBtu moderate-climate home:

(Propane: 50 MMBtu ÷ (0.0915 MMBtu/gal × 0.95) = 575 gal. Oil: 50 ÷ (0.1385 × 0.85) = 425 gal. Baseboard: 50 × 293.07 = 14,654 kWh — every kWh becomes heat, which is exactly the problem.)

A heat pump cuts heating cost by roughly 60% vs oil, 37% vs propane, and 65% vs electric resistance at average rates. The DOE’s long-standing figure — heat pumps can reduce electricity use for heating by up to 75% compared with electric resistance — is the same phenomenon: you’re buying 1 kWh and getting ~3 kWh of heat. If your home currently heats with oil, propane, or baseboards, the running-cost case for a heat pump is overwhelming in nearly every state; the only real question is the upfront cost, covered in our heat pump installation cost guide.

What Drives Your Bill: 8 Levers, Ranked by Impact

Two identical heat pumps in identical houses can have bills 2–3x apart. Here’s what creates the gap, in rough order of impact.

1. Your electricity rate (up to 4x swing). Covered above — it’s the master variable. Before touching anything else, know your all-in $/kWh and whether a time-of-use plan exists. A homeowner in San Diego at $0.35/kWh will never beat a homeowner in Spokane at $0.11/kWh, regardless of equipment.

2. Auxiliary heat runtime (up to 3.5x per hour when active). A 10 kW strip bank at $0.18/kWh costs $1.80/hour for the strips alone, versus ~$0.63/hour for the heat pump’s compressor. Every hour your system runs on strips instead of the compressor costs roughly triple. In cold climates, strips running just 3 hours a day through winter add ~$160/month. This lever deserves its own section — see below.

3. Home heat loss — insulation and air sealing (20–40% swing). The formula’s first input is “heat your home needs,” and a leaky house needs far more of it. Going from poor to good attic insulation and air sealing can cut heating load 20–30%; the DOE’s rule of thumb is that every degree you lower the thermostat saves ~3% on heating, which hints at how sensitive load is to the envelope. Ducts deserve special mention: the DOE and ENERGY STAR estimate typical duct systems lose 20–30% of heated and cooled air to leaks and poor insulation. A $500–$2,000 duct-sealing job on a leaky system often pays back in 2–3 years purely through lower heat pump runtime — and it helps every heating system you’ll ever own.

4. Thermostat strategy — the setback trap (10–25% swing, and it cuts the wrong way). With a gas furnace, deep nighttime setbacks save money: the furnace just burns a bit longer in the morning. Heat pumps punish this. Dropping 5°F overnight and recovering in the morning forces the system to work at maximum capacity — which triggers the auxiliary strips, the most expensive heat you own. That “recovery” can easily cost more than the setback saved. The rule: keep setbacks to 1–2°F, or use a thermostat with heat-pump-aware recovery that ramps the compressor early instead of calling strips. This single habit change is the cheapest bill reduction available — it costs $0.

5. System sizing — oversized units cost more to run (10–20% penalty). An oversized heat pump short-cycles: it blasts heat for a few minutes, shuts off, repeats. Short cycling is inefficient (startup is the costliest part of each cycle), dehumidifies poorly in summer, and wears equipment faster. Right-sizing via a Manual J load calculation isn’t just a comfort issue — it’s a running-cost issue. If your 2,000 sq ft moderate-climate home has a 5-ton unit, you’re likely paying a 10–20% efficiency penalty versus a right-sized 3-ton.

6. Maintenance state — dirty filters and coils (5–25% penalty). A clogged filter chokes airflow, forcing longer runtimes; dirty outdoor coils cripple heat transfer. The DOE estimates a dirty filter alone can increase energy consumption 5–15%, and neglected systems overall run 10–25% less efficiently. Filter changes are a $5, 5-minute job monthly during heating season; professional tune-ups ($150–$300, ideally twice yearly) keep refrigerant charge and airflow correct. Our heat pump maintenance cost guide breaks down exactly what each visit should include — treat maintenance as a bill-reduction strategy, not just equipment care.

7. Balance point and lockout settings (the silent $150–$320/winter). Your system’s “balance point” is the outdoor temperature below which the heat pump can’t carry the load alone and strips must help — commonly 25–35°F for standard systems, lower for cold-climate models. Many thermostats ship with aux-lockout set wrong (or unset), letting strips fire at 40°F+ where the heat pump would have been perfectly capable. Research benchmarks suggest correcting the lockout to the true balance point saves $150–$320 per winter at average rates. This is a 15-minute thermostat settings change — have your tech verify it at the next service visit.

8. Ductless vs ducted — no ducts, no duct losses. All else equal, a ductless mini-split system avoids the 20–30% duct-loss penalty entirely and zones room-by-room, so you’re not heating empty bedrooms. In practice, ductless systems often use 20–30% less energy for the same comfort — savings that come from zoning plus zero duct losses, not from magic. If you’re choosing between systems, factor this into running-cost projections, not just install quotes.

The Auxiliary-Heat Trap: A Deep Dive

If you remember one section of this guide, make it this one. Auxiliary heat is the difference between a heat pump owner who brags about low bills and one who posts a $600 January electric bill on Reddit.

What it is. “AUX HEAT” on your thermostat means electric-resistance heating elements — essentially a giant toaster — inside your air handler have switched on to help the heat pump. They engage in three situations: (a) outdoor temperature drops below your system’s balance point and the compressor can’t keep up; (b) during and after defrost cycles, to temper the cold air; (c) when you crank the thermostat up several degrees at once (the setback-recovery problem). They’re supposed to run dozens of hours per winter, not hundreds.

What it costs. The math is brutal because resistance heat has a COP of exactly 1.0 — one kWh in, one kWh of heat out — while your heat pump delivers ~2.5–3.5 kWh of heat per kWh:

A 10 kW strip package running 4 hours a day for a month: 10 × 4 × 30 = 1,200 kWh × $0.18 = $216/month just for the strips. A 15–20 kW package running heavily can add $500–$800+ to a single month’s bill. And here’s the kicker most owners miss: the strips and the heat pump draw simultaneously — your meter sees the combined 13.5+ kW, which is also why aux-heat months can trip demand charges on utilities that have them.

How to know if it’s your problem. Check your smart thermostat’s runtime history — Ecobee, Nest, and most modern thermostats report “Aux Heat” hours separately each month. Red flags: aux running for hours on days above 35°F; aux engaging every morning (that’s setback recovery — see lever #4); or a winter bill that jumps 2–3x over fall with no rate change. You can also have a technician clamp-meter the strip circuit to confirm actual draw versus thermostat staging.

The fixes, in order of cost: 1. Fix the lockout setting ($0–$150 service visit). Set aux lockout at or near your system’s true thermal balance point. Factory defaults are a frequent culprit — many systems allow strips at temperatures where the compressor alone would have sufficed. 2. Stop deep setbacks ($0). Keep overnight setbacks to 1–2°F so morning recovery doesn’t call strips. 3. Check staging. Many air handlers have multiple strip stages (e.g., 5 kW + 5 kW); a tech can verify only the needed stage engages, and that the heat pump leads. 4. Consider dual fuel. If you have gas available, a dual-fuel system burns gas instead of running strips below the switchover temperature — often dramatically cheaper per BTU than resistance heat at high electric rates. 5. Ductless has no strips. Mini-split systems typically have no backup resistance heat at all — one reason their winter bills stay predictable. (They simply lose capacity in extreme cold rather than switching to expensive backup.)

“Emergency heat” is not a mode, it’s a warning. The EM HEAT setting locks out the compressor and runs strips alone — the most expensive possible way to heat your home, roughly 3x the normal heat pump cost. It’s for true emergencies (compressor failure in a cold snap), not for “it’s really cold tonight.” If you find it switched on, switch it back and call for service if the compressor isn’t running.

10 Ways to Cut Your Heat Pump Running Costs

Ordered roughly by payback speed — cheapest and fastest first.

1. Shrink your thermostat setbacks to 1–2°F. Costs $0, saves 10–25% of winter waste if you’re currently doing deep setbacks. The strips you don’t trigger are the cheapest kWh you’ll never buy.

2. Verify your aux-heat lockout setting. A $0–$150 service-visit adjustment that saves an estimated $150–$320 per winter by keeping strips off above your true balance point. Ask your tech to confirm it at the next tune-up — most never check unless asked.

3. Change filters monthly in heating season. $5 and five minutes; a dirty filter can add 5–15% to energy use. Set a phone reminder for the first of each month, October through March.

4. Get on a time-of-use rate if your utility offers one. Shifting heating into off-peak hours — which winter heating does naturally overnight — cuts 20–50% off those kWh on many TOU plans. Call your utility and ask for a rate comparison using your last 12 months of usage; they do this math for free.

5. Seal your ducts. $500–$2,000 for professional duct sealing on a leaky system; with 20–30% duct losses typical, payback is often 2–3 years. Have ducts tested (a duct-blaster test runs $200–$400) before and after so you see the measured improvement.

6. Keep up with professional maintenance. Two tune-ups a year ($150–$300 each) protecting 10–25% efficiency is simple arithmetic: on a $1,100/year heating bill, a 15% efficiency loss costs $165/year — the tune-up pays for itself. Details in our maintenance cost guide.

7. Add attic insulation before upgrading equipment. $1,500–$3,500 for blown-in attic insulation; it cuts the heating load for every system you’ll ever own, typically 10–20%. Insulation is the only “efficiency upgrade” that never breaks, needs no maintenance, and works during power outages.

8. Use a heat-pump-aware thermostat — or configure yours correctly. Standard smart-thermostat algorithms can actually increase strip usage with aggressive recovery routines. Use the heat-pump-specific settings (often labeled “heat pump balance point,” “aux lockout,” or “compressor-first recovery”), and disable features that prioritize fast recovery over efficiency.

9. Zone what you can. If you have a zoned ducted system or are choosing equipment, heating only occupied areas cuts runtime proportionally. Even low-tech zoning — closing vents is not recommended (it raises static pressure), but a ductless head for the always-cold addition beats overheating the whole house — trims the load the heat pump must carry.

10. When replacing equipment, buy the HSPF2, not the hype. The jump from 7.5 to 10 HSPF2 cuts heating electricity ~25% for the life of the system — 15+ years of compounding savings. At $0.18/kWh on our 50 MMBtu home, that’s ~$300/year (6,668 kWh vs 5,001 kWh), or ~$4,500 over a 15-year equipment life. In cold climates or high-rate states, the premium for a cold-climate inverter model is usually the best dollars-per-saved-kWh you’ll spend.

Find YOUR Number: Three Ways to Read Your Own Bill

Everything so far has been scenarios. Here’s how to measure your actual heat pump cost from your own data — pick whichever method fits what you have.

Method 1 — Shoulder-month subtraction (needs: 12 months of bills). Your October and April bills, when you’re barely heating or cooling, are your household baseline — lights, appliances, water heating, everything except the heat pump working hard. Subtract a shoulder month’s kWh from January’s kWh; the difference is overwhelmingly your heat pump’s heating consumption. Example: January 1,850 kWh − October 640 kWh = 1,210 kWh for heating × your all-in rate ($0.19, say) = ~$230 for January heating. Crude but surprisingly accurate, and it automatically includes your aux-heat usage, duct losses, and thermostat habits — the real world, not a model.

Method 2 — Thermostat runtime × power draw (needs: smart thermostat). Ecobee, Nest, and most modern thermostats report monthly compressor hours and aux-heat hours separately. Multiply: (compressor hours × ~3.5 kW + aux hours × your strip kW) × your rate. Example: 280 compressor hours × 3.5 kW = 980 kWh, plus 35 aux hours × 10 kW = 350 kWh → 1,330 kWh × $0.18 = ~$239. This method also tells you where the money went — if aux hours are high relative to outdoor temperatures, you’ve found your problem (see the aux-heat section).

Method 3 — The all-in rate check (needs: one bill). Take any recent bill’s total dollars ÷ total kWh. That’s your true rate — generation + delivery + taxes + fees. In many states this runs 30–50% above the advertised generation rate. Every calculation in this guide should use this number, not the marketing number. If your utility has demand charges (a fee based on your peak kW in the month), note that aux-heat months spike your peak draw to 13–15 kW — some utilities bill $5–$10 per peak kW, adding another $50–$100 to strip-heavy months. Check your tariff’s fine print.

A final caution: compare total energy spending (gas + electric + oil + propane) year over year, not just the electric bill. Households switching from gas to a heat pump routinely panic at a doubled electric bill while ignoring the gas bill that fell by two-thirds. The only number that matters is the total.

Sources & methodology

Electricity rates: U.S. Energy Information Administration (EIA) Electric Power Monthly Table 5.6.A and Form EIA-861M — national average ~18.16–18.44¢/kWh (May–August 2026); state figures from the same releases (e.g., Louisiana ~12.9¢, Texas ~15.9–16.4¢, Florida ~15.0¢, New Jersey ~23.3¢, New York ~28.7–29.9¢, California ~29.8–33.6¢, Hawaii ~47–52¢). Natural gas ~$1.45–1.50/therm national residential average (EIA Natural Gas Monthly, 2026); heating oil $5.26/gal and propane $2.52/gal forecasts and household expenditure projections ($640 gas, $1,196 electric, $2,115 oil) from EIA’s 2026–27 Winter Fuels Outlook (October 6, 2026). Efficiency standards: DOE 2023 minimums (7.5 HSPF2 split / 6.7 packaged; 14.3/13.4 SEER2) and ENERGY STAR criteria (7.8 HSPF2; 8.1–8.5 cold-climate). Heat-pump power draw (3–5 kW), strip sizing (5–20 kW in 5 kW increments), and $/hour figures cross-checked against 2026 industry cost benchmarks; HSPF2→COP conversion uses 3,412 BTU/kWh. Climate-zone heating loads per DOE/IECC zone guidance; duct-loss 20–30% per DOE/ENERGY STAR; thermostat setback ~3% per degree per DOE. Federal tax-credit status: §25C/§25D ended for property placed in service after December 31, 2025, per the One Big Beautiful Bill Act (P.L. 119-21) and IRS FS-2025-05. All scenario math computed November 2026; figures are planning estimates, not quotes.

Disclaimer: 2026 US national figures and stated assumptions. Your actual running cost = your kWh × your all-in $/kWh rate — use the formulas in this guide with your real utility bill. Fuel prices vary by utility and season; get 3 written local quotes for equipment decisions. Tax information is general, not tax advice.