Furnace Installation in Draper, Utah

A furnace installation is not a swap-out. At sea-level elevation with a standard-construction home and a clean duct system, it approaches a swap-out. At SunCrest’s 6,200 feet with a 1998 construction home, a CSST gas line that has never been bonded to current code, and a 16×20 plenum that was undersized for the original furnace, it is an engineering project. The difference between these two scenarios plays out over 15–20 years in the equipment’s combustion performance, heat exchanger fatigue rate, and efficiency relative to its nameplate AFUE rating.

We install furnaces across the south Salt Lake Valley’s full elevation range — from the valley floor at 4,500 feet to SunCrest and Traverse Ridge above 6,400 feet — with altitude derating, load calculation, permit pull, and combustion analysis on every job. Free estimates, itemized quotes, no verbal pricing.

How We Size a New Furnace

ACCA Manual J Heating Load Calculation

Furnace sizing by square footage is not engineering. A 2,200 square foot 1975 Sandy brick home with original double-pane aluminum windows, no insulation in the wall cavity, and an uninsulated crawlspace carries a design heating load of 85,000–100,000 BTU/hr at the ASHRAE 99% design temperature of 9°F. A 2,200 square foot 2021 Daybreak home with triple-pane fiberglass windows, R-49 attic insulation, R-20 walls with continuous exterior insulation, and spray foam at the rim joists carries a design heating load of 28,000–38,000 BTU/hr at the same design temperature. Sizing both homes at “100,000 BTU because that’s what fits the square footage” installs the right equipment in the first home and a system that will short-cycle 15+ times per hour in the second.

Every furnace installation we quote begins with a documented ACCA Manual J heating load calculation. The inputs we collect on-site:

Home geometry: conditioned floor area by level, ceiling heights, attached garage thermal boundary, conditioned basement versus uninsulated crawlspace
Envelope insulation: attic R-value (we verify by measurement or visible assessment, not by homeowner recollection), wall construction type (2×4 or 2×6 framing, with or without continuous exterior insulation), floor type over unconditioned space
Windows: area by compass orientation, glazing type (single/double/triple), frame material, interior shading type
Infiltration: blower door result if available; estimated from construction type, age, sealing quality otherwise
Elevation: GPS-confirmed GPS elevation at the equipment location. Entered into the load calculation and used in the altitude-corrected equipment selection step
Design temperatures: 9°F ASHRAE 99% heating design temperature for the Draper valley floor; adjusted downward by 4–6°F for confirmed SunCrest and Traverse Ridge addresses based on documented temperature differentials relative to the valley floor

The Manual J output gives us the design heating load in BTU/hr. That number drives equipment selection downstream through ACCA Manual S.

Altitude Derating — The Step Most Installers Skip

Manufacturer furnace capacity is rated at sea level. The ANSI Z21.47 furnace standard and virtually every major manufacturer’s installation manual require altitude derating for installations above 2,000 feet above sea level. The standard derate is 4% per 1,000 feet of elevation above sea level.

Applied to the south Salt Lake Valley:

Draper valley floor (4,500 ft): 4,500 / 1,000 × 4% = 18% capacity reduction
South Mountain / Steeplechase bench (4,900 ft): 19.6% capacity reduction
SunCrest (6,200 ft): 6,200 / 1,000 × 4% = 24.8% capacity reduction
Traverse Ridge (6,400 ft): 25.6% capacity reduction

A Carrier 59TN6 with a 100,000 BTU/hr nameplate input installed at SunCrest without derating is delivering approximately 75,200 BTU/hr effective output after applying the altitude correction. The gas valve manifold pressure must be reduced from sea-level specification to achieve this lower input rate and prevent the rich-burn combustion that accelerates heat exchanger fatigue. We perform and document this derate calculation on every installation above 4,000 feet. The calculation result, the manifold pressure target, and the measured manifold pressure at startup are all recorded in the installation commissioning report provided to the homeowner.

Venting Design Per UMC Section 510

90%+ AFUE condensing furnaces (Category IV appliances) use PVC or CPVC sidewall or rooftop venting. 80% AFUE non-condensing furnaces use B-vent (Type B double-wall metal vent) typically routed through the existing chimney chase. Venting design requirements from UMC Section 510 and the manufacturer’s installation manual include:

PVC Category IV venting: 2″ or 3″ Schedule 40 PVC from the furnace to the exterior termination, sloped minimum 1/4″ per linear foot back toward the furnace for condensate drainage, termination clearances of 12″ above grade, 12″ from operable windows, and 12″ from gas meter regulators. At SunCrest and Traverse Ridge, termination height must account for design snowpack on the ground and against exterior walls — we spec an 18–24″ clearance above typical winter snow grade, not the code minimum 12″, because code minimum clearances are occasionally buried by Wasatch Front snowfall events.
B-vent Category I venting: Properly sized B-vent per Table 10-1 of the UMC for the furnace BTU input at the specific stack height and lateral run length. At altitude, a B-vent system sized for a 100,000 BTU sea-level furnace may be oversized for the derated 75,200 BTU altitude-corrected input, resulting in inadequate draft velocity and condensation in the vent connector. We re-size the vent connector when derate changes the effective input below the minimum required for the existing stack height.
Combustion air: Modern tight-construction homes in Daybreak, Rosecrest, and newer Herriman builds often require dedicated combustion air for non-sealed-combustion furnaces. We evaluate combustion air adequacy per UMC Section 701 on every installation and spec a dedicated combustion air duct if required.

CSST Gas Line Bonding

Corrugated stainless steel tubing (CSST) gas lines installed in many Draper, Sandy, and South Jordan homes from the late 1990s through 2010s require bonding to the home’s electrical grounding system per IRC G2411 and Dominion Energy’s bonding bulletin. Bonding protects CSST from arc perforation during nearby lightning events — a documented failure mode in Intermountain West construction that has produced gas fires in homes where the CSST was unbonded. We inspect CSST bonding status on every furnace installation and complete bonding if it is missing, with documentation provided to the homeowner. This is included in our installation scope, not a separate add-on.

Equipment We Install

Carrier

59TN6 Infinity Series (96% AFUE, Modulating): Our most common premium residential installation in the south Salt Lake Valley. The modulating gas valve (from 40% to 100% of rated input in 1% increments) allows precise altitude correction and produces the most consistent indoor temperature of any single-piece heating equipment. The Infinity communicating system provides real-time fault monitoring and allows homeowners to view combustion status and runtime data from the thermostat or the Carrier app. R-value equivalent AFUE at altitude: approximately 95.8% at valley floor, approximately 95.2% at SunCrest after input derate.

58CVA Performance Series (96% AFUE, Two-Stage): Two-stage operation (65% and 100% input) provides better part-load efficiency than single-stage without the gas valve complexity of modulating. Appropriate for homes where the Infinity communicating system is not a priority and budget constrains the modulating option. More field-repairable than modulating systems due to simpler gas valve design.

58MCA Performance Series (80% AFUE, Two-Stage): 80% AFUE two-stage for installations where the existing chimney B-vent is sound, the upgrade to a condensing system would require significant new PVC venting, and the homeowner’s payback horizon does not support the 96% efficiency premium. Common in older Sandy and Draper homes with original masonry chimney chases in good condition.

Trane

S9V2 (96% AFUE, Two-Stage Variable Speed): Trane’s workhorse condensing furnace for the south valley market. ECM variable-speed blower motor provides consistent airflow across changing external static conditions — an advantage in older Draper and Sandy homes where ductwork static pressure is not what the original designer intended. ComfortLink II communicating thermostat compatible.

S8X2 (80% AFUE, Two-Stage): Trane’s 80% AFUE option for B-vent applications. Robust construction typical of Trane’s residential line; parts availability through Watsco and Carrier Enterprise in the Salt Lake market is reliable.

Lennox

SLP99V (99% AFUE, Modulating Variable Speed): Lennox’s highest-efficiency residential furnace. The SLP99V’s modulating gas valve and variable-speed ECM blower make it the most efficient gas furnace we install, with documented AFUE as tested at altitude in the 97–98% range after input correction. The tradeoff is installation sensitivity: the SLP99V requires precise gas valve calibration, iComfort S30 thermostat commissioning, and static pressure verification within tighter tolerances than simpler furnaces. We install the SLP99V only on homes where the duct system and electrical service can support its requirements.

Rheem

R98MV (98% AFUE, Modulating Variable Speed): Rheem’s modulating condensing option. Dual-pressure switch configuration provides additional safety redundancy on the inducer proving sequence. Popular in Daybreak and Rosecrest new construction due to Rheem’s builder program pricing and distributor availability through local HVAC wholesalers.

The Installation Process

Before Installation Day

Building permit pulled through the applicable municipal department
Equipment ordered and delivery confirmed
Installation crew and arrival window communicated by phone the evening prior

Installation Day

Protective floor covering from entry to mechanical room
Before photos of existing installation
Gas shutoff at the street valve and at the furnace shutoff; pressure test of the existing gas line before and after new connections
Existing furnace disconnection at electrical panel (breaker off and locked), gas line, venting, and ductwork
New furnace installation per manufacturer requirements: level mounting, minimum clearances to combustibles, duct connections, gas connection with leak detection spray at all joints
Venting installation per UMC Section 510 for the equipment category (Category I B-vent or Category IV PVC)
Electrical wiring: line voltage at the furnace disconnect, low-voltage thermostat wiring with polarity verified at the control board
Gas valve manifold pressure adjustment for altitude (for all installations above 4,000 feet)

Startup and Commissioning

Combustion analysis: Testo 320 Basic combustion analyzer inserted in the flue gas at steady state on each firing stage. Targets: CO air-free under 100 ppm (system shut down and fault found if above 200 ppm), O₂ 5–9%, stack temperature within manufacturer specification band. CO in ambient air at the draft hood: zero or trace.
Gas pressure verification: Incoming line pressure measured at the gas valve inlet. Manifold pressure measured at the gas valve outlet and compared against the altitude-corrected target. Documented in commissioning report.
Static pressure: Total external static measured at four points. Target under 0.5″ WC for residential blowers, or within the manufacturer’s specified range for ECM variable-speed systems that regulate airflow rather than pressure.
Temperature rise: Supply air temperature measured at the supply plenum; return air temperature at the return plenum. Temperature rise verified within the manufacturer’s rated range (typically 35–65°F for 80% AFUE units, 25–55°F for 96%+ units). Temperature rise outside this range indicates either a static pressure problem or a gas valve setting issue that must be corrected before the installation is complete.
All firing stages tested: Single-stage at 100%, two-stage at 65% and 100%, modulating at 40% and 100% minimum, with intermediate modulation verified on modulating units by thermostat setpoint ramp.

After Installation

Commissioning report provided: combustion analysis readings, gas pressure measurements, static pressure, temperature rise, altitude derate calculation, and permit card copy
Manufacturer warranty registered within the required window (60 days for Carrier and Trane, 60 days for Lennox Premier Dealer, 90 days for Rheem)
Warranty registration confirmation emailed to homeowner within 24 hours
Permit final inspection scheduled with the applicable building department

Rebates and Tax Credits

Inflation Reduction Act 25C Tax Credit (2026): Up to $600 for qualifying 95%+ AFUE gas furnaces meeting ENERGY STAR criteria. Credit is claimed on IRS Form 5695. We provide the manufacturer’s certification statement required for filing.
Dominion Energy Thermwise Rebate: Current rebate of $400 for 95%+ AFUE qualifying furnaces. We provide the AHRI certification number and installation documentation required for the rebate application.
Rocky Mountain Power Wattsmart: Rebates for qualifying ECM variable-speed blower furnaces. Available on furnaces installed with variable-speed blower motors in Rocky Mountain Power service territory.

Frequently Asked Questions

How much does furnace installation cost in Draper?: Furnace installation in our service area ranges from $4,800 to $11,500 installed depending on efficiency tier, capacity, venting type, and installation complexity. An 80% AFUE single-stage replacement in a Sandy bench home with existing B-vent and sound gas line runs $4,800–$6,400. A 96% AFUE modulating replacement in SunCrest with new PVC sidewall venting, CSST bonding, altitude derate, and Draper City permit runs $8,200–$11,500. Every quote is itemized — equipment, labor by phase, permit fees, sheet metal, venting materials, and any gas line modifications are listed separately. We do not use “package pricing” that hides margin.
How long does furnace installation take?: A standard furnace replacement in a single-family home (existing ductwork retained, B-vent or PVC vent in good condition, no major sheet metal modifications) typically takes 5–7 hours for a two-technician crew. Installations requiring new PVC venting through an exterior wall, sheet metal plenum fabrication, or CSST bonding run 7–9 hours. The startup and commissioning phase — combustion analysis, gas pressure verification, static pressure, temperature rise — is not rushed regardless of time remaining in the day. We have finished furnace startups at 8 p.m. because the combustion analysis required multiple manifold pressure adjustments to get within spec. The family needed heat that night, not a commitment to return the next day.
What happens if my new furnace fails inspection?: We correct the deficiency and reschedule the inspection at no additional cost. Our internal startup protocol catches the overwhelming majority of issues that would cause a code inspection failure before the inspector arrives — combustion analysis, gas pressure, vent termination clearances, CSST bonding, and temperature rise are all verified on the day of installation. When inspection failures occur (rarely), they are typically administrative: permit documentation not posted at the site, a condensate drain routing that conflicts with a specific inspector’s interpretation of the applicable code section. Safety-related failures from our own installation defects have not occurred in our recent history, but if they did, the labor warranty covers the correction.
Can I keep my existing ductwork with a new furnace?: Usually yes, with verification. Our Manual D duct check confirms whether the existing ductwork can deliver the new furnace’s required airflow. In most south Salt Lake Valley homes built from the 1980s onward, the existing ductwork is adequate for a same-capacity replacement with a properly sized plenum transition. Issues that require duct modification: the new furnace has a larger cabinet footprint than the old one (requiring plenum re-fabrication), the existing system has high static pressure that a new ECM variable-speed blower will attempt to compensate for by running at higher speed (increasing noise and energy use), or the transition from an 80% to a 96% AFUE unit changes the air handler direction (upflow to downflow or horizontal) due to PVC venting constraints. We identify all of these at the estimate visit.
Do you install furnaces in SunCrest and Traverse Ridge?: Yes — SunCrest and Traverse Ridge are among our most frequent installation areas. We have completed more than 90 high-altitude installations across these neighborhoods and are familiar with the specific requirements: altitude derate per manufacturer table, PVC vent termination above winter snow grade (18–24″ rather than the code minimum 12″), CSST bonding, and winter-weather site access on Traverse Ridge Road and SunCrest’s access roads. We schedule SunCrest and Traverse Ridge installations with weather monitoring and communicate realistic arrival windows when road conditions require adjustment.

Contact Draper Heating & Air Conditioning

Free in-home furnace installation estimates across Draper, Sandy, Bluffdale, Riverton, South Jordan, and Herriman. We bring a load calculation and a combustion analysis kit, not a price sheet with package options.

Phone (24/7): (385) 336-1837
Address: 12244 Business Park Dr #155, Draper, UT 84020
Email: info@draperheatingairconditioning.xyz
Utah DOPL HVAC Contractor License: #11487612-5501
EPA Section 608 Universal: #608U-2011-318472

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Furnace Installation Draper UT | Draper Heating & Air