HVAC System Replacement in Salt Lake County
Most HVAC system replacements happen at the worst possible time — during the coldest week of January when the 22-year-old furnace finally fails on a Sunday night, or during the first 100°F stretch in July when the AC quits at 6 PM on a Friday. In those moments, customers don’t get the time to research equipment options, compare contractors, or think carefully about efficiency trade-offs. They get whichever contractor can install the soonest, with whatever equipment the contractor has in stock. The result is often a quickly-installed mid-tier system that the customer lives with for the next 15–20 years, regretting that they didn’t have more time to make the decision well.
The customers who avoid this scenario are the ones who replaced their HVAC system proactively before the existing one failed — when there was time to evaluate options, when contractors weren’t operating in emergency mode, and when the equipment selection reflected actual priorities rather than urgent availability. Proactive replacement on equipment 15+ years old, particularly equipment showing repeated repair calls or efficiency degradation, almost always produces better outcomes than waiting until catastrophic failure forces the decision.
Below is what HVAC system replacement involves done correctly, how to think about timing, equipment selection across efficiency and feature tiers, what proper installation includes, and what your investment buys in long-term comfort, efficiency, and reliability.
When System Replacement Makes Sense
Age-Based Replacement (Proactive)
Typical residential equipment service lives:
- Furnaces: 15–20 years (longer for premium equipment with good maintenance; shorter for neglected equipment in challenging conditions)
- Air conditioners: 12–18 years
- Heat pumps: 12–15 years (heat pumps work harder than single-mode equipment)
- Boilers: 15–30 years depending on type (cast iron longer; modulating condensing shorter)
Equipment approaching or past these service lives benefits from proactive replacement planning before catastrophic failure forces an emergency decision. Customers with 18-year-old furnaces and 15-year-old AC condensers should be planning replacement, not waiting for failure.
Repair-vs-Replace Math
The general rule: when a single repair on older equipment costs more than 50% of replacement cost, replacement is usually the better economic decision. The math:
- $2,500 compressor replacement on 12-year-old AC condenser with $8,000 replacement cost: 31% of replacement — repair makes sense
- $2,500 compressor replacement on 14-year-old AC condenser with $8,000 replacement cost: 31% of replacement, but with 4+ years of expected remaining service life vs. new equipment’s 15-year warranty — replacement starts becoming reasonable
- $2,500 compressor replacement on 16-year-old AC condenser: 31% of replacement, but only 2–3 years of expected remaining life — replacement is almost certainly the better decision
The math also factors in efficiency gains (new equipment is dramatically more efficient than equipment from 15+ years ago) and warranty coverage (replacement equipment includes 10-year compressor warranty; repair on old equipment carries our 2-year labor warranty plus the manufacturer warranty on the new part).
Efficiency-Driven Replacement
Some customers replace functioning equipment to capture efficiency gains. Math here is harder — the upfront replacement cost is substantial, and efficiency savings on utility bills accumulate over years rather than producing immediate payback. For most customers, efficiency-driven replacement of functioning equipment doesn’t pay back faster than allowing equipment to reach end of natural life. Exceptions: very old equipment (20+ years) where efficiency gap is large, customers planning long-term residence with strong environmental priorities, customers in homes where current equipment is dramatically undersized or oversized.
Comfort-Driven Replacement
Some customers replace functioning equipment because comfort issues — uneven heating or cooling between rooms, humidity problems, noise, short-cycling — make daily life unsatisfying. Comfort-driven replacement is legitimate; HVAC is supposed to make homes comfortable, and equipment that isn’t doing that job justifies upgrade investment regardless of pure economic math.
Safety-Driven Replacement
Failed heat exchanger, severe combustion problems requiring extensive corrections, refrigerant leaks requiring R-22 replacement (no longer manufactured), or other safety conditions that effectively require replacement. We discuss safety findings clearly when they arise and explain why replacement is the appropriate response.
Whole-System vs. Partial Replacement
Sometimes replacement of only one component makes sense — failed AC with functional furnace, failed furnace with functional AC, failed condenser with functional evaporator coil. We assess case-by-case rather than pushing whole-system replacement when only one component has failed. That said, when partial replacement is performed, we verify that the replacement component is matched to the remaining components for compatibility and that the existing components have remaining service life justifying the partial approach.
Equipment Selection Across Tiers
Most installations involve choosing between several equipment tiers based on efficiency, staging, and features. The three primary tiers:
Single-Stage Equipment
Operates at full-on or full-off — no modulation between firing rates. The most affordable tier upfront.
- Pros: Lower equipment cost, simpler controls, well-proven technology, broadly compatible with existing thermostats
- Cons: Less efficient than higher-tier equipment, larger temperature swings between cycles, less precise comfort control, shorter cycles in mild weather (more on/off cycling)
- Best for: Budget-constrained replacements, customers planning to move within several years, smaller homes where the comfort difference is less noticeable
- Typical pricing: Furnace $4,500–$8,500; AC $5,500–$8,500; heat pump $6,500–$10,500
Two-Stage Equipment
Operates at two firing rates — low fire (approximately 60–70% of capacity) for mild conditions and high fire (full capacity) for extreme conditions. Most equipment operates in low fire 70–80% of the time during typical weather, producing better efficiency, longer cycles, and more even comfort.
- Pros: Better efficiency than single-stage (typically 5–15% improvement), more even temperature distribution, longer run cycles in mild weather, quieter operation
- Cons: Higher equipment cost, requires compatible thermostat (most modern smart thermostats handle two-stage), slightly more complex controls
- Best for: Customers wanting noticeable comfort improvement, mid-range budgets, customers staying in homes 7+ years
- Typical pricing: Furnace $7,000–$11,000; AC $7,500–$10,500; heat pump $9,000–$14,000
Modulating/Variable-Speed Equipment
Operates at continuously variable firing rates — anywhere from approximately 35% to 100% of capacity in fine increments. Variable-speed blowers similarly adjust airflow continuously rather than at fixed speeds. The premium tier with the best comfort and efficiency.
- Pros: Highest efficiency (94–98% AFUE on modulating gas furnaces, 22+ SEER2 on variable-speed AC, 20+ SEER2 on variable-speed heat pumps), best comfort and humidity control, quietest operation, longest run cycles producing the most consistent temperatures, best filtration and dehumidification
- Cons: Highest equipment cost, requires compatible smart thermostat, more complex controls and diagnostics, sometimes requires specialty service technicians
- Best for: Customers prioritizing comfort and efficiency, long-term homeowners (10+ year horizons), homes with humidity sensitivities or significant comfort imbalances, customers maximizing federal tax credits and utility rebates
- Typical pricing: Furnace $9,500–$14,000; AC $11,000–$16,000; heat pump $14,000–$22,000
Heat Pump vs. Furnace + AC Decision
Replacement is also a chance to evaluate heat pump conversion vs. continued gas heating. The decision depends on several factors:
When Heat Pumps Make Sense
- Mild climate zones where winter design temperatures rarely drop below 25°F (some Salt Lake Valley microclimates qualify; mountain areas often don’t)
- Customers prioritizing environmental footprint (heat pumps run on electricity that increasingly comes from renewable sources)
- Customers with rooftop solar (heat pump electricity demand pairs well with solar generation)
- Customers maximizing federal tax credits (heat pump installations qualify for up to $2,000 federal tax credit, often more under Inflation Reduction Act income-qualified rebates)
- Customers replacing both furnace and AC simultaneously — heat pump installs at this point cost only modestly more than replacing both individually
- Homes without existing gas service (heat pumps eliminate the need for gas line and combustion venting)
When Gas Heating Makes Sense
- Customers with strong preference for gas heating — instant warmth, lower operating cost during severe cold
- Homes in colder microclimates where winter design temperatures regularly drop below 5°F (heat pumps work but require backup heat below balance point)
- Customers replacing only furnace (functional AC remains; converting to heat pump requires AC replacement too)
- Budget-constrained replacements where lower-tier gas equipment fits better than higher-tier heat pump equipment
Dual-Fuel Systems (Heat Pump + Backup Furnace)
Combines a heat pump (for primary heating and all cooling) with a smaller backup gas furnace (for the coldest weather when heat pump efficiency drops). The “best of both worlds” approach — heat pump efficiency in mild weather, gas heating reliability in extreme weather. Higher equipment cost than either single-fuel option but optimized for varied climate conditions.
- Typical pricing: $14,000–$24,000 depending on equipment tier
- Best for: Customers wanting heat pump efficiency benefits with gas backup security, customers in Salt Lake microclimates with occasional severe cold, customers replacing both heating and cooling and wanting modern dual-fuel optimization
What’s Included in System Replacement
Every Aegis system replacement includes the following workmanship and process elements:
Pre-Installation Planning
- Manual J load calculation performed on-site as part of the install quote
- Equipment selection across efficiency and feature tiers with written quotes for 2–3 options when relevant
- Sizing verification — Manual J calculation ensures replacement equipment is properly sized for the home’s actual heating and cooling load rather than just matching the size of existing equipment
- Ductwork assessment — verify existing ductwork is appropriate for new equipment airflow and static pressure
- Electrical capacity verification for higher-amperage equipment
- Gas service evaluation for gas equipment
- Permit filing with the local jurisdiction
Installation Day Workmanship
- Drop cloth and floor protection in all work areas
- Equipment removal and disposal per environmental regulations (refrigerant recovery to EPA standards, proper disposal of old equipment)
- Custom sheet metal fabrication for plenums and transitions where stock sizes don’t fit properly
- Refrigerant line work on cooling/heat pump replacements — nitrogen purge during brazing to prevent oxide formation, vacuum to 500 microns and held to verify dryness, charge by weight per manufacturer specification
- Gas line work performed by Travis Hollings under his Utah journeyman plumber endorsement when gas line modifications are required
- Electrical connections properly sized, properly torqued, properly tested
- Condensate drain with proper trap, slope, and termination
- Thermostat installation with proper staging configuration for the new equipment
- Mastic-sealed connections at all duct interfaces (not tape — tape fails over time)
Commissioning
- Combustion analysis on gas equipment with altitude-corrected manifold pressure verified
- Refrigerant charge verification by superheat or subcool method at actual operating conditions
- Static pressure measurement across the air handler
- Temperature differential verification
- Electrical readings on all motors and controls
- Safety control verification
- Equipment-specific operational tests per manufacturer commissioning requirements
- Written commissioning report emailed at completion
Customer Handoff
- Equipment operation walkthrough — how to use the thermostat, when to change filters, what sounds are normal vs. abnormal
- Maintenance schedule — recommended tune-up frequency, filter replacement intervals, additional maintenance items specific to the new equipment
- Documentation packet — manufacturer warranty registration confirmation, commissioning report, equipment manuals (paper or digital based on customer preference)
Post-Installation
- Manufacturer warranty registration filed on your behalf within a week
- Utility rebate filing for Rocky Mountain Power Wattsmart and Dominion Energy Therm-Wise qualifying equipment
- Federal tax credit documentation for 25C Energy Efficient Home Improvement Tax Credit
- IRA Home Electrification rebate filing for income-qualified customers installing qualifying heat pumps
- 30-day post-install check-in to verify the system is operating as expected
- 2-year Aegis labor warranty on standard installations, 5-year on premium equipment, 10-year available for purchase
HVAC Replacement Pricing
Total system replacement pricing varies based on equipment tier, complexity of the installation, and any required additional work. Typical ranges:
Furnace Only Replacement
- 80% AFUE atmospheric-vent furnace (older homes with masonry chimneys): $4,500–$7,500
- 96% AFUE single-stage condensing furnace: $5,500–$8,500
- 96% AFUE two-stage condensing furnace: $7,000–$11,000
- 96–98% AFUE modulating condensing furnace: $9,500–$14,000
AC Only Replacement
- 14–16 SEER2 single-stage AC: $5,500–$8,500
- 17–19 SEER2 two-stage AC: $7,500–$10,500
- 20+ SEER2 variable-speed AC: $11,000–$16,000
Heat Pump Replacement
- 15–16 SEER2 single-stage heat pump: $6,500–$10,500
- 17–18 SEER2 two-stage heat pump: $9,000–$14,000
- 19+ SEER2 variable-speed heat pump (cold-climate models): $14,000–$22,000
- Dual-fuel system (heat pump + backup furnace): $14,000–$24,000
Full System Replacement
- Standard furnace + AC combination (single-stage): $10,000–$16,000
- Premium furnace + AC combination (two-stage or higher): $14,000–$22,000
- High-end variable-speed combinations: $18,000–$28,000+
Additional Cost Factors
- Ductwork modifications — significant duct sealing, balancing, or repairs identified during replacement: $500–$3,000 depending on scope
- Electrical upgrades — new circuits, panel upgrades for higher-amperage equipment: $300–$1,500
- Gas line modifications — gas line upsizing or relocation for new equipment: $400–$1,500
- Condensate pump or drain extension for new condensing equipment in locations without nearby drains: $200–$600
- IAQ upgrades — media filter cabinet, humidifier, UV system installed as part of replacement project: $400–$2,400 depending on equipment
- Thermostat upgrade to smart thermostat with proper equipment staging: $200–$500 installed
Available Rebates and Tax Credits
Modeled into every quote with documented filing after installation:
- Federal 25C Energy Efficient Home Improvement Tax Credit — up to $600 on qualifying furnaces and AC, up to $2,000 on qualifying heat pumps
- Rocky Mountain Power Wattsmart rebates on qualifying high-efficiency cooling and heat pump equipment
- Dominion Energy Therm-Wise rebates on qualifying high-efficiency heating equipment
- Inflation Reduction Act Home Electrification rebates for income-qualified households installing qualifying heat pumps or other electrification equipment — up to $8,000 for heat pump installations depending on household income
We don’t oversell rebates that don’t apply. Quotes show modeled rebates as separate line items so you see real net cost after every available incentive.
Frequently Asked Questions
- How long does HVAC replacement take?
- Furnace only: typically one day, 6–8 hours on-site. AC only: typically one day, 4–6 hours. Full system changeout (furnace + AC + matched coil): one to two days. Heat pump replacement: typically one day, 6–8 hours. Dual-fuel system installation: typically two days. Larger projects with ductwork modifications can take 2–3 days. We confirm timeline in the written quote.
- How do I know what size system I need?
- Manual J load calculation — performed on-site as part of every install quote. The calculation accounts for square footage, insulation, windows, infiltration, internal gains, and Salt Lake’s elevation-corrected design temperatures. The right-sized system is often smaller than what’s being replaced. Sizing from existing equipment or square-footage rules typically produces oversized systems that short-cycle and fail prematurely.
- Should I replace just the AC or both AC and furnace?
- Depends on the age and condition of each component. If both are 12+ years old, replacing them together captures matched-component efficiency (best when AC condenser, evaporator coil, and air handler/furnace are matched for optimal performance) and avoids a second installation project within a few years. If only one component has failed and the other has significant remaining life, partial replacement makes sense. We assess case-by-case.
- Will the new system save money on utility bills?
- Typically yes — modern equipment is dramatically more efficient than equipment from 15+ years ago. Real savings depend on the efficiency gap between old and new equipment and your operating patterns. Some customers see 20–40% reduction in heating costs after upgrading from an old 80% AFUE furnace to a modern 96% modulating condensing furnace. Variable-speed AC can produce 15–30% summer electric savings vs. older single-stage equipment.
- What’s the warranty on a new system?
- Manufacturer warranties vary by equipment but typically: 10 years on compressors (cooling and heat pumps), 20 years or lifetime on heat exchangers (furnaces), 10 years on most other components. Aegis adds a 2-year labor warranty (5-year on premium equipment, 10-year available for purchase) covering installation workmanship. We register manufacturer warranties on your behalf within a week of installation — failure to register within the 60–90 day window can default coverage to shorter standard terms.
- Do you offer financing for system replacement?
- Yes. Synchrony Bank promotional 0% APR for 18 months on qualifying installations; Service Finance Company longer-term fixed-rate financing up to 120 months. Applications can be completed online or during the in-home estimate; approval typically same-day. See our financing page for full details.
- What if I’m not sure between heat pump and furnace+AC?
- The in-home estimate process is designed to help you understand the trade-offs. We discuss your priorities (efficiency, comfort, environmental considerations, budget), evaluate your home’s existing setup (electrical capacity, gas service, ductwork), and model both options with installation cost, operating cost projections, and available rebates and tax credits. Many customers come in unsure and leave the estimate with a clear preference based on the actual numbers for their specific situation.
Schedule an HVAC Replacement Consultation
If your existing system is approaching end of service life, has experienced major component failure, or simply isn’t delivering the comfort and efficiency you want, call (385) 250-0687 for a free in-home estimate. Estimates include Manual J load calculation, equipment recommendations across price tiers, modeled rebates and tax credits, and financing options.
- Phone: (385) 250-0687
- Email: info@aegisheatingandair.xyz
- Address: 4454 Manhattan Ct, West Valley City, UT 84120