Less than it costs. The 2025 Cost vs Value Report puts HVAC electrification at 72% recouped, so $19,484 spent returns $14,053 at resale. Appraisers add no separate line for your HVAC. The real money sits on the other side: an old system invites a price cut, and a furnace that cannot hold 50 degrees can block an FHA loan.
Almost every page answering this question is written by somebody who sells HVAC. They quote uplifts of 2 to 10%, 5 to 10% or “up to 10%”, none of them sourced, and several contradict themselves within the same article. The published data says something different and more useful.
What the only real dataset says
The Cost vs Value Report is the annual study that pairs contractor job costs with resale value estimates from real estate professionals. In the 2025 national figures, the HVAC project it tracks is electrification, converting a gas furnace and AC to a heat pump. It costs $19,484 and returns $14,053. That is 72% recouped, and a net $5,431 out of pocket.
72% is not a bad number in isolation. The useful part is where it sits.
| Rank | Project | Job cost | Added at resale | Recouped |
|---|---|---|---|---|
| 1 | Garage door replacement | $4,672 | $12,507 | 268% |
| 2 | Entry door replacement, steel | $2,435 | $5,270 | 216% |
| 5 | Minor kitchen remodel, midrange | $28,458 | $32,141 | 113% |
| 7 | Backup power generator | $13,534 | $12,902 | 95% |
| 11 | Bath remodel, midrange | $26,138 | $20,915 | 80% |
| 13 | HVAC conversion, electrification | $19,484 | $14,053 | 72% |
| 16 | Roofing replacement, asphalt | $31,871 | $21,501 | 68% |
| 19 | Major kitchen remodel, midrange | $82,793 | $42,130 | 51% |
| 27 | Solar power installation | $55,937 | $16,625 | 30% |
| 28 | Primary suite addition, upscale | $351,613 | $63,136 | 18% |
Selected rows from the 28 projects in the 2025 Cost vs Value Report, national averages. HVAC conversion is the only HVAC project tracked. The headline comparison: a garage door costs 4.2 times less than the HVAC job and returns $12,507 against the HVAC's $14,053.
Thirteenth out of twenty eight projects. And look at the top row against the HVAC row, because this is the comparison nobody runs: a $4,672 garage door adds $12,507 at resale. A $19,484 HVAC conversion adds $14,053. You spend 4.2 times as much to add 12% more resale value.
So if the question is purely “what is the best way to spend money before selling”, HVAC is not the answer, and no honest reading of the data makes it the answer.
Why appraisers do not add a line for your HVAC
This is the mechanism almost no page explains, and it is the reason the uplift figures floating around are made up.
An appraiser does not price your house component by component and then total it. Residential appraisals for conventional loans use Fannie Mae’s standardised condition ratings, C1 through C6. Read the official definitions and you will notice something: HVAC is never named. C3 mentions “some newer mechanicals” in passing. C5 says some components “may be missing or near the end of their” useful life. That is the whole of it. There is no heating line, no cooling line, and no dollar adjustment for a new system.
Your HVAC is one input into a single overall condition grade. A new system can help nudge a house from C4 to C3. It cannot, on its own, be worth a specific number, because the form has no box to put that number in.
This is why “a new HVAC adds $10,000 to your appraisal” is not a cautious estimate. It is a description of something that does not happen.
The 50 degree rule that can stop a sale
Here is the part that actually costs people money, and it is nowhere in the top results.
If your buyer is using an FHA loan, HUD Handbook 4000.1 applies. It requires the appraiser to examine the heating system “to determine if it is adequate for healthful and comfortable living conditions, regardless of design, fuel or heat source”, and the system must automatically heat the living areas to a minimum of 50 degrees. If it cannot, the appraiser documents a deficiency, and the deficiency has to be cured before the loan closes.
Central air conditioning is different. FHA does not require it. But where it is present, it has to be in working condition.
So a dead furnace is not a valuation question at all. It is an eligibility question. It does not shave a few thousand off your price, it removes a slice of your buyer pool until it is fixed, and it hands the remaining buyers a repair they can insist on before closing.
Three different things people mean by value
Most of the confusion in this topic comes from blending three separate numbers. They move for different reasons.
| Which value | Who decides it | What actually moves it | Does new HVAC move it? |
|---|---|---|---|
| Appraised value the lender's number |
The appraiser | Comparable sales, square footage, and one overall condition rating C1 to C6. There is no HVAC line on the form. | Barely. Only if it shifts the whole condition grade. |
| Negotiated sale price the buyer's number |
The buyer, after the inspection | What the inspection report flags, and what the buyer thinks fixing it will cost them. | Yes, and this is where the money is. |
| Time on market | The buyer pool | Price, photos, and whether the house feels like a project. An old system reads as a pending bill. | Probably, but no solid public data puts a number on it. |
| Loan eligibility the one nobody lists |
HUD rules, for FHA buyers | Whether the heating system can automatically hold the living areas at 50 degrees. | It is pass or fail, not a price. |
Condition ratings per Fannie Mae's published definitions, which never name HVAC. The 50 degree requirement is from HUD Handbook 4000.1 and applies where the buyer is financing with an FHA loan.
Notice which column the HVAC sits in. It barely touches the appraisal. It sits almost entirely in the negotiated price, as leverage, which is exactly why a page written by a contractor and a page written by an appraiser give such different answers while both believing they are right.
So how much is the discount you are avoiding?
Honest answer: there is no good public dataset on the HVAC specific discount, and any page that gives you a precise figure is guessing. We are not going to invent one.
What you can do is set the ceiling yourself, because the arithmetic is bounded. A buyer who finds a 19 year old system in the inspection report asks for a credit. The most they can credibly ask for is what replacement actually costs, because that is the number their own contractor will quote them. Work out that figure for your house and system, and you have the upper limit on the concession, which is the real number in this decision.
Our HVAC System Cost Calculator gives you that replacement figure split by line item, and how long an AC unit lasts tells you whether an inspector is likely to flag yours at all.
Should you replace it before selling?
The data points to a clear split, and it is not the split the contractors describe.
| Your situation | Replace before selling? | Why |
|---|---|---|
| The heating does not work, or cannot hold 50 degrees | Yes, fix it | This is not a value decision. An FHA appraisal will flag it and the deficiency has to be cured before closing. |
| The AC is present but dead | Repair or remove | FHA does not require AC, but where it exists it has to work. A broken one is a flagged defect for no benefit. |
| System is past 15 years but working | Usually no, offer a credit | The inspector will flag the age and the buyer will ask. A credit costs roughly the same and skips the project, the timing risk and retail pricing. |
| System is under 10 years and working | No | Nothing to flag. Spending $19,484 to recover $14,053 on a system you will never use is a straight loss. |
| No central air at all, in a hot market where every comparable has it | Get it priced | This is the one case that is not an upgrade but a missing feature, so it shows up against your comparables. Still check the cost against the gap before committing. |
| You are staying several more years | Different question | Then resale value is not the measure. Running cost, comfort and avoiding an emergency replacement in January are. |
The 50 degree requirement is from HUD Handbook 4000.1 and applies to FHA financed buyers. Cost and resale figures are the 2025 Cost vs Value national averages for HVAC electrification, so your own quote will differ by region and system.
The pattern across every row is the same. Replace it when the system is a problem. Do not replace it to create value, because the 72% figure says the market will hand you back less than you put in, and you will have spent the money on a system you never get to use.
If you have decided to replace, the money is in how you buy, not whether you buy. Timing and quote comparison move the price far more than negotiating with one contractor does.
Quick answers
Does a new HVAC increase home value?
Not by its cost. Published data puts HVAC electrification at 72% recouped, so it is a net loss of around $5,400 on a $19,484 job. It helps a house sell, it does not add value in the way an appraiser would recognise.
Does an old HVAC lower the appraisal?
Only through the overall condition rating, and only if it is bad enough to move that rating. Age alone usually does not. A system that does not work is different, because it can trigger an appraisal deficiency rather than a valuation adjustment.
How much does a new furnace add to a home?
There is no published furnace specific figure. The closest sourced number is the 72% recouped for a full HVAC conversion. Treat any article quoting a precise furnace uplift as unsourced, because none of them cite one.
Do buyers care about a new HVAC?
They care about not inheriting a bill. That shows up as fewer requested credits and a shorter negotiation, not as a higher offer. The two are easy to confuse because both end with you keeping more money.
Is it better to replace the HVAC or offer a credit?
A credit is usually cheaper, because you pay roughly the system cost either way but avoid the project, the timing risk and paying retail. The exception is the FHA 50 degree rule, where a non working heating system has to be cured, not credited.
Sources and date
Checked 6 October 2026. Cost recouped figures from the 2025 Cost vs Value Report, national averages, which is the most recent edition published. Condition rating definitions from Fannie Mae’s condition and quality rating definitions. The heating requirement is from HUD Handbook 4000.1, summarised here. The net cost and multiple comparisons are our own arithmetic from the Cost vs Value figures.
Cost vs Value is published annually and the project list changes between editions. This page is reviewed when a new edition appears.
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HVAC System Cost Calculator
Work out what replacing your system actually costs, split by equipment, labour and ductwork. That figure is the ceiling on what a buyer can credibly ask you to knock off.
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