HVAC Replacement Cost in Lehi, UT (2026 Guide)
A full HVAC replacement in Lehi has to handle both dry 95-100F summer peaks and hard winter cold snaps well, which shapes what equipment makes sense here. This guide breaks down replacement costs and options; see the Lehi HVAC hub for the full picture, or get matched with a vetted local pro now.
By Jason Green · HVAC · Published September 18, 2026 · Updated September 18, 2026 · 8 min read
What drives replacement cost in Lehi
System size (tonnage), efficiency tier, and whether you're doing a straight swap versus adding or modifying ductwork all drive the final price. Homes with original ductwork from Lehi's recent construction boom in areas like Traverse Mountain or Jordan Willows are usually straightforward swaps, while older homes near Lehi Historic Downtown converting from evaporative cooling need new ductwork and electrical work factored in.
Heat pumps have become a more common replacement choice statewide because Rocky Mountain Power's Wattsmart Homes program offers standalone incentives for qualifying air-source heat pump tiers, which can meaningfully offset the higher upfront equipment cost 1.
Furnace and AC replacement pricing
A standard furnace-and-AC replacement in a home with existing ductwork is the most common and most affordably priced option. High-efficiency furnaces (95%+ AFUE) cost more upfront but may qualify for Dominion Energy Utah ThermWise rebates, so it's worth checking current program terms before you choose equipment 2.
Heat pump replacement
Heat pumps handle Lehi's cooling season well and can supplement or replace gas heat, though very cold winter snaps mean many local installs pair a heat pump with a backup gas furnace (a dual-fuel setup) rather than going all-electric, especially in homes without strong insulation.
Converting from evaporative cooling to central air
If your Lehi home still runs on an aging swamp cooler, converting to central refrigerated air is a bigger project than a like-for-like swap since it usually requires new supply ductwork and dedicated electrical circuits, but it delivers more consistent comfort control and works better during occasional humid late-summer spikes.
Permits and rebates to plan for
Any full system replacement requires a mechanical permit through Lehi City's Building Permit Submittal Portal, with fees based on project valuation 3. Before signing a contract, ask your contractor whether your chosen equipment qualifies for current Rocky Mountain Power or Dominion Energy Utah rebates, since both programs change tiers and amounts periodically.
Typical cost ranges
| Furnace replacement only (80-95% AFUE) | $3,200 - $6,500 |
| AC condenser + coil replacement only | $3,500 - $7,000 |
| Full AC + furnace replacement (3-4 ton) | $6,000 - $11,500 |
| Heat pump system replacement | $6,500 - $12,500 |
| Dual-fuel heat pump + backup furnace system | $8,500 - $14,500 |
| Evaporative cooler replacement (like-for-like) | $1,800 - $4,000 |
| Evaporative-to-central-air conversion (new ductwork) | $7,000 - $14,000 |
| Whole-home humidifier add-on | $450 - $1,100 |
Ranges are general estimates gathered from homeowner-reported quotes, not an offer or a quote for your project.
Common questions
Is a heat pump a good choice for a Lehi home?
Heat pumps handle Lehi's cooling season well, and many local installs pair them with a backup gas furnace for the coldest winter snaps in a dual-fuel setup, especially in less-insulated homes.
Are there rebates for a new HVAC system in Lehi?
Rocky Mountain Power's Wattsmart Homes program and Dominion Energy Utah's ThermWise program have both offered rebates on qualifying high-efficiency equipment; confirm current tiers and amounts directly with each utility before buying.
How much does it cost to convert from a swamp cooler to central air?
Conversion typically costs more than a like-for-like AC swap because it usually requires new ductwork and electrical work, generally landing in the $7,000-$14,000 range depending on home size and duct layout.
Do I need a permit for a full HVAC replacement in Lehi?
Yes, a mechanical permit through Lehi City's Building Permit Submittal Portal is required, with fees assessed based on project valuation.
How long does a typical HVAC replacement take in Lehi?
A straightforward furnace-and-AC swap with existing ductwork usually takes one day; conversions from evaporative cooling or major ductwork changes can take two to four days.
What size system does my Lehi home need?
A proper Manual J load calculation, not a rule-of-thumb per-square-foot estimate, accounts for your home's insulation, orientation, and Lehi's specific summer and winter design temperatures.
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