Gas Furnace to Heat Pump Conversion
This looks at the heating conversion from the electrification angle specifically: you're not just replacing worn-out equipment, you're deciding to move off gas heat entirely, potentially years before the furnace would otherwise need replacing.
At your inputs, the gas-to-heat-pump conversion pays back in 20.0 years and changes your annual cost by $500 a year.
| Net cost after confirmed incentives | $10,000 |
|---|---|
| Annual savings | $500 |
- This uses planning estimates you entered, not a contractor quote or guaranteed savings.
- A lower calculated cost does not measure comfort, noise, or panel-capacity constraints; weigh those separately.
What this also tells you: If your annual savings are 20% higher or lower than entered, the conversion payback would move from 25.0 years to 16.7 years.
This is a planning estimate based on your entries. It does not size equipment, determine electrical or building-code compliance, verify incentive eligibility, or replace a contractor quote or professional energy audit.
Why this decision comes up
Electrification-motivated conversions often happen to equipment that still works, which changes the math from a typical replacement decision: the full cost of the new heat pump counts against savings, with no offsetting "it was going to fail anyway" logic.
How this is calculated
This is a standard payback calculation: net conversion cost divided by annual savings against your current gas heating cost. Because you are replacing working equipment, your net cost input should reflect the full conversion cost, not a marginal cost over an already-planned replacement.
A worked example
With the defaults ($10,000 net cost, $1,600/year gas heating cost dropping to $1,100/year), the annual savings is $500 and payback lands at 20.0 years, a long horizon typical of converting equipment before it needs replacing anyway. A confirmed incentive or a favorable electricity-to-gas rate ratio can shorten this substantially.
Common mistakes
A common mistake is comparing this payback against the shorter payback shown by the HVAC replace-vs-repair tools, which assume the old equipment was failing anyway. An early, motivated conversion of working equipment is a different, generally longer-payback decision.
Limitations
This does not value the remaining service life given up by replacing working equipment early, or any non-financial motivation for electrifying sooner rather than later.
Common questions
How is this different from the heat pump vs. gas furnace tool in the HVAC section?
That tool assumes your furnace already needs replacing and compares two options for what comes next. This one is for a working furnace: the question is whether converting early, purely for electrification, makes economic sense on its own.
Does an early conversion waste the remaining life of my furnace?
In pure economic terms, some remaining furnace value is left on the table with an early conversion. This tool does not value that lost remaining life directly; it only compares the conversion cost against ongoing annual savings.
What if I am doing this for reasons besides cost, like removing gas from my home?
That is a legitimate reason this tool does not capture. Use the payback result as one input to your decision, not the only one, if non-financial reasons matter to you.
Does an early conversion require an electrical panel upgrade?
Sometimes, especially in older homes. If a panel upgrade is required, add its cost into your net conversion cost here, or use the panel upgrade cost impact tool to see that cost's effect on the broader project separately.
What if I want to keep the gas furnace as backup instead of fully converting?
That is a dual-fuel setup, a different configuration than the all-electric conversion this tool assumes. The HVAC cluster's heat pump vs. dual-fuel tool covers that comparison.