Switching from a gas furnace to a heat pump is one of the more consequential home energy decisions homeowners consider, and the honest answer to “how much will I save” is: it depends heavily on your specific situation, more than most single-appliance switches on a typical energy-saving checklist. This guide walks through the real variables that determine your savings, with realistic scenarios so you can estimate where your own household is likely to land.
The Starting Point: Your Current Furnace’s Efficiency
How much you stand to save depends significantly on what you’re switching from, not just what you’re switching to:
- Older, standard-efficiency furnace (around 80% AFUE) — the biggest opportunity for savings, since a meaningful share of the fuel you’re currently burning is already being wasted regardless of what replaces it.
- Newer, high-efficiency furnace (95%+ AFUE) — a smaller efficiency gap to close, meaning the comparison against a heat pump comes down more to the fuel cost difference (electricity vs. gas) than to an efficiency improvement.
If your current furnace is old and inefficient, some of your “savings” from switching would actually come from replacing aging, underperforming equipment with any modern system — worth keeping in mind when evaluating quotes that frame all of the projected savings as being specifically about the fuel switch itself.
Three Realistic Scenarios
Scenario A: Replacing an old, inefficient gas furnace in a moderate climate
- Old furnace (80% AFUE) annual cost: ~$950
- New cold-climate heat pump annual cost: ~$650
- Estimated annual savings: ~$300
This scenario captures both the efficiency gain from replacing old equipment and a genuine fuel-cost advantage in a moderate climate — the combination that tends to produce the most noticeable savings.
Scenario B: Replacing a newer, high-efficiency furnace in a moderate climate
- High-efficiency furnace (95% AFUE) annual cost: ~$750
- New cold-climate heat pump annual cost: ~$650
- Estimated annual savings: ~$100
Here, since the furnace you’re replacing was already efficient, the savings come almost entirely from the underlying fuel cost comparison rather than an efficiency leap — still positive in this scenario, but more modest.
Scenario C: Replacing a furnace (any efficiency) in a genuinely cold climate
- High-efficiency furnace (95% AFUE) annual cost: ~$800
- Cold-climate heat pump annual cost: ~$850
- Estimated annual difference: roughly break-even to a modest ~$50 additional cost
In genuinely cold climates, heat pump efficiency declines enough that the comparison narrows and can occasionally favor gas slightly, depending on your specific local electricity and gas rates — this is the scenario where the decision to switch is more reasonably driven by factors beyond pure operating cost (see below), rather than an expectation of significant guaranteed savings.
For a broader comparison of equipment costs and operating expenses, see our guide to heat pumps vs. gas furnaces.
(All figures use national average rates — electricity around $0.16/kWh, natural gas around $1.20/therm — and will shift based on your specific local rates, which matter as much as the scenario itself.)
The Factor That Matters Most: Your Local Rate Ratio
The single biggest variable in whether switching saves you money isn’t the equipment — it’s the relationship between your local electricity rate and your local natural gas rate. As covered in our guide on [electric bill vs. gas bill: how to compare real costs], natural gas is typically cheaper per unit of raw energy than electricity, but a heat pump’s multiplying efficiency can close or reverse that gap depending on the specific numbers.
A rough way to think about it: the higher your electricity rate relative to your gas rate, the smaller (or more negative) your potential savings from switching. Conversely, in areas with relatively low electricity rates and relatively high natural gas rates — a combination that’s become more common as gas prices have trended upward nationally, as covered in our [best natural gas plans for heating season] guide — switching tends to produce more favorable savings.
For additional guidance on heat pump efficiency, cold-weather performance, and dual-fuel systems, consult the U.S. Department of Energy’s Heat Pump Systems guide.
Why Rising Natural Gas Prices Change This Calculation Over Time
National natural gas prices have been on an upward trend, and forecasts point to continued increases. If this trend continues over the 15-20 year lifespan of new heating equipment, the relative cost advantage of gas heating could narrow further, which is worth factoring into a long-term decision even if today’s specific numbers show only a modest or break-even savings scenario. This isn’t a guarantee — energy prices fluctuate in both directions over time — but it’s a reasonable consideration when weighing a decision meant to last well over a decade.
Savings Beyond the Monthly Heating Bill
Combined heating and cooling
If you’d otherwise need to replace an aging central air conditioner separately from your furnace, a heat pump’s combined heating-and-cooling function avoids that second purchase entirely — a meaningful factor that a pure heating-cost comparison doesn’t capture.
Reduced dependence on a single fuel source
Some homeowners weigh the value of consolidating to a single utility relationship (electricity only) against maintaining both gas and electric service, including avoiding a separate gas customer/service charge that applies regardless of usage.
Rebates and incentives
While the federal tax credit for heat pumps expired at the end of 2025 (see our [federal solar tax credit 2026 guide] for the broader context), state and utility rebates remain available in many areas and can meaningfully offset the upfront switching cost — see our [heat pump rebates and tax credits available in 2026] guide for specifics.
For a breakdown of current state and utility incentives, read our guide to heat pump rebates and tax credits available in 2026. Verify program availability and eligibility before including a rebate in your savings estimate.
When Switching Might Not Make Financial Sense (Yet)
- You recently installed a new, high-efficiency gas furnace. The savings case is weaker if you’re replacing equipment that isn’t due for replacement anyway, since you’d be absorbing a full new equipment cost well before the existing system’s useful life is over.
- You’re in a genuinely cold climate with a favorable local gas rate relative to electricity. As Scenario C above illustrates, the pure operating-cost case can be close to break-even or modestly favor gas in specific rate environments.
- Your existing ductwork or electrical panel would need significant modification, adding substantial upfront cost that extends the payback period considerably, Before making a decision, review our guide to how much it costs to install a heat pump to understand the upfront costs that can affect your payback period.
If your home uses electric baseboard heating instead of a gas furnace, the economics can be quite different. See our comparison of heat pumps vs. electric baseboard heating for another perspective on potential operating-cost savings.
How to Estimate Your Own Savings
- Find your current furnace’s AFUE rating (on the equipment nameplate or in your owner’s manual) and your actual annual gas usage from your bills.
- Get a heat pump quote with a projected HSPF2 rating and estimated annual operating cost specific to your home and climate, not a generic national estimate.
- Compare using your actual local electricity and gas rates, not national averages, since this ratio is the single biggest driver of your real savings.
- Factor in whether you’d need a new AC unit regardless, since this changes the fair comparison from “heating cost only” to “total HVAC cost.”
- Ask your installer to model a few different climate/usage scenarios if you’re on the fence, rather than relying on a single point estimate.
When comparing equipment for a cold climate, review ENERGY STAR’s guidance on air-source heat pumps and ask your contractor to confirm that the selected model is appropriate for your local winter temperatures.
Final Thoughts
The honest answer to “how much will I save switching from gas to a heat pump” is that it depends heavily on your current furnace’s efficiency, your climate, and — more than almost any other factor — the specific relationship between your local electricity and gas rates. Homeowners replacing an old, inefficient furnace in a moderate climate tend to see the most meaningful savings, while those in genuinely cold climates or already running efficient gas equipment may see savings closer to break-even, with the decision then reasonably resting on factors beyond pure monthly cost, like combined heating-and-cooling convenience or reduced reliance on a second fuel source. Running your own numbers with your actual rates, rather than a generic national estimate, is the only reliable way to know where your specific household lands.