2025 refrigerant change
HVAC in Grafton, WI
What a new heating and cooling system really costs, and how to size it right.
- Cost data tuned to your area
- See the numbers with no sales call
- Refreshed for 2026 rules & rebates
Typical system replacement in Grafton
$8,400–$13,700
Most pay around $11,100 · AC + gas furnace · 2,100 sq ft
$220–$600/yrEnergy bill savings
≈ $7,400 over 18 yrs
Find top-rated HVAC prosSponsored. We may earn a commission from this affiliate link, which helps run coconest.
Cost per unit
$4–$6.5
per sq ft of home
Most popular here
AC + gas furnace
~48% of U.S. installs
Typical timeline
1–3 days
Start to finish
Typical lifespan
15–22 yrs
AC + gas furnace
Cost estimator
Estimate your system replacement
Adjust the inputs to match your home. Figures blend national pricing with Grafton's local cost index. They're guidance ranges, not quotes.
Build your estimate
Tuned to Grafton labor and material pricing. Adjust to match your project.
2,100 sq ft
1,000 sq ftMost homes: 1,500–2,8004,000 sq ft
Recommended size for this home: ≈ 3.5 tons
A common pairing: central air plus a high-efficiency gas furnace.
Estimated total
$8,400–$13,700
$4–$6.5 per sq ft of home
BudgetPremium
- Est. energy savings
- $220–$600/yr
- Midpoint estimate
- $11,100
Planning estimate, not a quote, your actual price varies by contractor, materials, and scope.
System type
What each option costs
Adjusted for Grafton. Premium choices cost more up front but often last longer or perform better.
AC + gas furnace$8,400–$13,700
Heat pump (all-electric)$9,500–$15,800
Dual-fuel (hybrid)$11,600–$15,800
Ductless mini-split$10,500–$18,900
Most popular here
AC + gas furnace
~48% of U.S. installs
Typical timeline
1–3 days
start to finish
Energy bill savings
$220–$600/yr
≈ $7,400 over 18 yrs
The real payoff of a new system is years of lower bills. Moving from an aging, low-efficiency unit to a modern high-efficiency one can trim a few hundred dollars a year off heating and cooling across a long season.
Spot a fair quote in Grafton
A typical system replacement here runs $8,400–$13,700. A fair quote starts with a Manual J load calculation. Be wary of anyone who sizes a system off square footage alone or pushes a same-day signature.
- Ask for the Manual J load calc, not a rule-of-thumb size.
- Confirm the SEER2/AFUE rating and that it's A2L-compliant.
- Get the labor warranty and rebate paperwork in writing.
What changes your price
- System type & efficiency. Heat pump vs dual-fuel and the SEER2/HSPF2 tier move the price the most.
- Ductwork condition. Leaky or undersized ducts may need sealing or replacement to hit rated performance.
- 2025 refrigerant change. New systems use A2L refrigerant (R-454B/R-32) and run 10–20% higher than pre-2025 equipment.
- Proper sizing (Manual J). A load calculation prevents the costly mistake of oversizing or undersizing the system.
Seasonal pricing
When system replacement costs the least in Grafton
Demand and weather move installer pricing through the year. These are modeled trends for Grafton; the actual timing and savings vary.
Price vs the yearly average
Cheaper Pricier
Best time to buy
May
About 6% below average · ≈ $650 less on a typical job
Peak demand
January
About 8% above average · ≈ $900 more on a typical job
Find top-rated HVAC prosSponsored. We may earn a commission from this affiliate link, which helps run coconest.
Why it matters
Why it pays to do it right
Comfort in the toughest weather
An undersized or failing system can't keep up when the weather turns extreme, in deep cold or relentless heat. Right-sized equipment holds temperature without short-cycling.
The repair-vs-replace tipping point
Once a system is 12+ years old and out of warranty, a major repair often costs more than it buys, especially with old-refrigerant prices climbing.
Lower, steadier energy bills
Jumping from an aging unit to a high-efficiency one can cut heating and cooling costs meaningfully over a long season.
Cleaner, healthier air
New systems filter and dehumidify better, which matters when homes are sealed up for months of winter.
Local conditions
HVAC in Milwaukee
Heating is the dominant load in Grafton: We Energies supplies natural gas and electricity to most Milwaukee homes, and the long, cold winters with lake-effect cold snaps make system sizing critical. High-efficiency furnaces and cold-climate heat pumps both have a strong case here, and Focus on Energy rebates can offset a meaningful share of the upgrade cost.
Heating degree days
~7,200
Long cold winters heavily favor a high-efficiency furnace or cold-climate heat pump with backup heat.
Lake-effect cold snaps
Common
Lake Michigan can pull bitterly cold air and amplify wind chill; equipment must handle sub-zero design temps.
Cooling degree days
~600
Warm, humid summers mean AC matters, but heating drives the system size and the energy bill.
Rebates & incentives
We Energies and Focus on Energy, Wisconsin's statewide efficiency program, offer rebates on high-efficiency furnaces, heat pumps, and smart thermostats in Grafton. The federal 25C heat-pump tax credit expired at the end of 2025, so for 2026 the savings come from those We Energies and Focus on Energy rebates plus efficient-equipment financing.
Permits
Grafton requires a mechanical permit for HVAC system changeouts; a licensed installer typically pulls it as part of the job.
FAQ
HVAC questions, answered for Grafton
How much does a new HVAC system cost in Grafton?
Most Grafton homeowners replacing a full system pay in line with the range shown above, driven by system type, efficiency tier, and ductwork condition. The 2025 switch to A2L refrigerant has pushed new-equipment prices up modestly.
Does a heat pump work in Milwaukee winters?
Yes, with backup. A cold-climate heat pump handles most Milwaukee heating days efficiently, but Grafton's sub-zero stretches and lake-effect cold snaps mean a gas-furnace or electric-resistance backup is nearly always included in a dual-fuel setup.
What rebates are available in Grafton?
We Energies offers rebates on qualifying heat pumps and furnaces, and Focus on Energy layers additional Wisconsin state incentives. The federal 25C credit expired at the end of 2025, so for 2026 lean on those utility and state programs. Ask your installer which programs your system qualifies for.
Should I keep my gas furnace in Grafton?
Often yes, as backup. Many Milwaukee homeowners pair an efficient heat pump with their existing gas furnace: the heat pump covers milder days, and the furnace takes over on the coldest nights, a practical fit for Wisconsin's climate.
How long does an HVAC installation take?
Most full system replacements take one to two days; ductwork modifications or a new installation can add another day or two.
Guides
HVAC guides & buyer tips
Go deeper on costs, materials, and how to choose, then price it for your home above.
Cost guide
HVAC replacement cost and how to size a new system
What a new heating and cooling system costs in 2026, how the 2025 refrigerant change affects pricing, and how to size equipment right with a Manual J load calculation.
Read guideComparisonHeat pump vs. furnace and AC: how to choose
All-electric heat pump, gas furnace with AC, or a dual-fuel hybrid? How the three compare on cost, comfort, and operating expense, and which fits your climate.
Read guideComparisonAC repair vs. replace: when to stop fixing an old system
When an air conditioner is worth repairing and when to replace it, based on age, the cost of the fix, refrigerant type, and the 2025 refrigerant change that reset equipment prices.
Read guidePlanningSEER2, AFUE, and HSPF2 explained
What the efficiency ratings on an HVAC quote actually mean. SEER2 and EER2 for cooling, HSPF2 for heat pumps, AFUE for furnaces, plus the 2023 minimums and what's worth paying for.
Read guidePlanningWhat size AC or furnace do you need?
Why HVAC sizing is a load calculation, not a guess. How Manual J works, what tonnage and BTUs mean, and why an oversized system short-cycles and wears out early.
Read guidePlanningDo heat pumps work in cold climates?
Modern cold-climate heat pumps keep heating well below freezing. How they perform in deep cold, what backup heat and HSPF2 mean, and when dual-fuel makes sense.
Read guideHow we estimate: ranges combine national pricing with Grafton's local cost index and the options you choose. They're modeled for planning and may differ from contractor quotes. Always get an on-site assessment before you commit.
Pricing modeled for 2026Sources & method